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BayCenSI - Center for Stable Isotope Research in Ecology and Biogeochemistry

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Publications

2021

Gerhard Gebauer, Julienne Schweiger: The use of multi-element stable isotope natural abundance (d13C, d15N, d2H) to elucidate orchid mycorrhizal nutrition. - (Paper), Veranstaltung: 2021 Virtual World Orchid Conference, 23.-26. April 2021, Taichung, Taiwan.

Robert Weigel, Hugh A. L. Henry, Ilka Beil, Gerhard Gebauer, Gerald Jurasinski, Marcin Klisz, Ernst van der Maaten, Lena Muffler, Jürgen Kreyling: Ecosystem processes show uniform sensitivity to winter soil temperature change across a gradient from central to cold marginal stands of a major temperate forest tree. In: Ecosystems, 24 (2021). - S. 1545-1560.
doi:10.1007/s10021-021-00600-4

Philipp P. Sprenger, Christian Müsse, Juliane Hartke, Barbara Feldmeyer, Thomas Schmitt, Gerhard Gebauer, Florian Menzel: Dinner with the roommates : trophic niche differentiation and competition in a mutualistic ant-ant association. In: Ecological Entomology, 46 (2021). - S. 562-572.
doi:10.1111/een.13002

Philipp Giesemann, Hanne N. Rasmussen, Gerhard Gebauer: Partial mycoheterotrophy is common among chlorophyllous plants with Paris-type arbuscular mycorrhiza. In: Annals of Botany, 127 (2021). - S. 645-653.
doi:10.1093/aob/mcab003

Hugh Henry, Jürgen Kreyling, Gerhard Gebauer, Marcin Klisz, Robert Weigel: 15 N tracer enrichment in response to winter soil temperature manipulation differs between canopy trees and juveniles. In: Trees, 35 (2021). - S. 325-331.
doi:10.1007/s00468-020-02003-9

Sebastian Steibl, Robert Sigl, Sanja Blaha, Sophia Drescher, Gerhard Gebauer, Elif Gürkal, Frederic Hüftlein, Anna Satzger, Michael Schwarzer, Dimitri Seidenath, Jana Welfenbach, Raphael S. Zinser, Christian Laforsch: Allochthonous resources are less important for faunal communities on highly productive, small tropical islands. In: Ecology and Evolution, 11 (2021). - S. 13128-13138.
doi:10.1002/ece3.8035

Gerhard Gebauer, Stephan Clemens: Stealing sugar from the honey fungus. In: Plant, Cell & Environment, 44 (2021). - S. 17-19.
doi:10.1111/pce.13909

Stefan G. Bindereif, Felix Rüll, Peter Kolb, Lucas Köberle, Holger Willms, Simon Steidele, Stephan Schwarzinger, Gerhard Gebauer: Impact of Global Climate Change on the European Barley Market Requires Novel Multi-Method Approaches to Preserve Crop Quality and Authenticity. In: Foods, 10 (2021). - .
doi:10.3390/foods10071592

2020

Philipp Giesemann, David Eichenberg, Marcus Stöckel, Lukas F. Seifert, Sofia I. F. Gomes, Vincent Merckx, Gerhard Gebauer: Dark septate endophytes and arbuscular mycorrhizal fungi (Paris‐morphotype) affect the stable isotope composition of 'classically' non-mycorrhizal plants. In: Functional Ecology, 34 (2020). - S. 2453-2466.
doi:10.1111/1365-2435.13673

Philipp Giesemann, Hanne N. Rasmussen, Heiko T. Liebel, Gerhard Gebauer: Discreet heterotrophs : Green plants that receive fungal carbon through Paris-type arbuscular mycorrhiza. In: New Phytologist, 226 (2020). - S. 960-966.
doi:10.1111/nph.16367

Sofia I. Fernandes Gomes, Vincent Merckx, Judith Kehl, Gerhard Gebauer: Mycoheterotrophic plants living on arbuscular mycorrhizal fungi are generally enriched in ¹³C, ¹⁵N, and ²H isotopes. In: Journal of Ecology, 108 (2020). - S. 1250-1261.
doi:10.1111/1365-2745.13381

2019

Stefan G. Bindereif, Felix Brauer, Jan-Marcel Schubert, Stephan Schwarzinger, Gerhard Gebauer: Complementary use of ¹H NMR and multi-element IRMS in association with chemometrics enables effective origin analysis of cocoa beans (Theobroma cacao L.). In: Food Chemistry, 299 (2019). - .
doi:10.1016/j.foodchem.2019.125105

Silvia Parra Suárez, Stefan Peiffer, Gerhard Gebauer: Origin and fate of nitrate runoff in an agricultural catchment: Haean, South Korea : Comparison of two extremely different monsoon seasons. In: Science of the Total Environment, 648 (2019). - S. 66-79.
doi:10.1016/j.scitotenv.2018.08.115

Saskia Klink, Philipp Giesemann, Gerhard Gebauer: Picky carnivorous plants? Investigating preferences for preys' trophic levels : a stable isotope natural abundance approach with two terrestrial and two aquatic Lentibulariaceae tested in Central Europe. In: Annals of Botany, 123 (2019). - S. 1167-1177.
doi:10.1093/aob/mcz022

Grace A. Hoysted, Alison S. Jacob, Jill Kowal, Philipp Giesemann, Martin I. Bidartondo, Jeffrey G. Duckett, Gerhard Gebauer, William R. Rimington, Sebastian Schornack, Silvia Pressel, Katie J. Field: Mucoromycotina fine root endophyte fungi form nutritional mutualisms with vascular plants. In: Plant Physiology, 181 (2019). - S. 565-577.
doi:10.1104/pp.19.00729

Julienne Schweiger, Christian Kemnade, Martin I. Bidartondo, Gerhard Gebauer: Light limitation and partial mycoheterotrophy in rhizoctonia-associated orchids. In: Oecologia, 189 (2019). - S. 375-383.
doi:10.1007/s00442-019-04340-0

Silvia Parra Suárez, Gerhard Gebauer: The fate of monsoonal atmospheric nitrate deposition in two forest catchments in Soyang lake watershed, South Korea : a mass balance and stable isotope approach. In: Biogeochemistry, 142 (2019). - S. 95-116.
doi:10.1007/s10533-018-0522-2

Laura Skates, M. Paniw, A. T. Cross, F. Ojeda, K. W. Dixon, J. C. Stevens, Gerhard Gebauer: An ecological perspective on “plant carnivory beyond bogs” : nutritional benefits of prey capture for the Mediterranean carnivorous plant Drosophyllum lusitanicum. In: Annals of Botany, 124 (2019). - S. 65-76.
doi:10.1093/aob/mcz045

2018

Julienne Schweiger, Martin I. Bidartondo, Gerhard Gebauer: Stable isotope signatures of underground seedlings reveal the organic matter gained by adult orchids from mycorrhizal fungi. In: Functional Ecology, 32 (2018). - S. 870-881.
doi:10.1111/1365-2435.13042

Felix B. Rosumek, Nico Blüthgen, Adrian Brückner, Florian Menzel, Gerhard Gebauer, Michael Heethoff: Unveiling community patterns and trophic niches of tropical and temperate ants using an integrative framework of field data, stable isotopes and fatty acids. In: PeerJ, 6 (2018). - .
doi:10.7717/peerj.5467

Martin Novak, Silvia Parra Suárez, Gerhard Gebauer, Michael Thoma, Frantisek Buzek, Bohuslava Cejkova, Ivana Jackova, Marketa Stepanova, Eva Prechova, Jan Curik, Frantisek Veselovsky, Ivana Valkova, Vladimir Blaha, Daniela Fottova, Arnost Komarek: Relationship between nitrogen isotope ratios of NO₃⁻ and N₂O in vertical porewater profiles through a polluted rain-fed peat bog. In: Soil Biology & Biochemistry, 123 (2018). - S. 7-9.
doi:10.1016/j.soilbio.2018.04.022

Michael F. Fay, Moritz Feustel, Colin Newlands, Gerhard Gebauer: Inferring the mycorrhizal status of introduced plants of Cypripedium calceolus (Orchidaceae) in northern England using stable isotope analysis. In: Botanical Journal of the Linnean Society, 186 (2018). - S. 587-590.
doi:10.1093/botlinnean/box104

Yuki Ogura-Tsujita, Gerhard Gebauer, Hui Xu, Yu Fukasawa, Hidetaka Umata, Kenshi Tetsuka, Miho Kubota, Julienne Schweiger, Satoshi Yamashita, Nitaro Maekawa, Masayuki Maki, Shiro Isshiki, Tomohisa Yukawa: The giant mycoheterotrophic orchid Erythrorchis altissima is associated mainly with a divergent set of wood-decaying fungi. In: Molecular Ecology, 27 (2018). - S. 1324-1337.
doi:10.1111/mec.14524

2017

Sina Berger, Gerhard Gebauer, Christian Blodau, Klaus-Holger Knorr: Peatlands in a eutrophic world : Assessing the state of a poor fen-bog transition in southern Ontario, Canada, after long term nutrient input and altered hydrological conditions. In: Soil Biology & Biochemistry, 114 (2017). - S. 131-144.
doi:10.1016/j.soilbio.2017.07.011

Julienne Schiebold, Martin I. Bidartondo, Peter Karasch, Barbara Gravendeel, Gerhard Gebauer: You are what you get from your fungi : nitrogen stable isotope patterns in Epipactis species. In: Annals of Botany, 119 (2017). - S. 1085-1095.
doi:10.1093/aob/mcw265

Gerhard Gebauer, Julienne Schiebold: Stable isotope natural abundance analysis as a tool for understanding orchid mycorrhizal nutrition. In: Nigel Swarts, Kingsley W. Dixon (Hrsg.): Conservation methods for terrestrial orchids. - Plantation, FL : J. Ross Publishing, 2017. - S. 27-31.

Julienne Schiebold, Martin I. Bidartondo, Florian Lenhard, Andreas Makiola, Gerhard Gebauer: Exploiting mycorrhizas in broad daylight : Partial mycoheterotrophy is a common nutritional strategy in meadow orchids. In: Journal of Ecology, 106 (2017). - S. 168-178.
doi:10.1111/1365-2745.12831

2016

Nicole A. Hynson, Julienne Schiebold, Gerhard Gebauer: Plant family identity distinguishes patterns of carbon and nitrogen stable isotope abundance and nitrogen concentration in mycoheterotrophic plants associated with ectomycorrhizal fungi. In: Annals of Botany, 118 (2016). - S. 467-479.
doi:10.1093/aob/mcw119

Gerhard Gebauer, Katja Preiß, Andreas C. Gebauer: Partial mycoheterotrophy is more widespread among orchids than previously assumed. In: New Phytologist, 211 (2016). - S. 11-15.
doi:10.1111/nph.13865

Katharina Palmer, Julia Köpp, Gerhard Gebauer, Marcus A. Horn: Drying-rewetting and flooding impact denitrifier activity rather than community structure in a moderately acidic fen. In: Frontiers in Microbiology, 7 (2016). - .
doi:10.3389/fmicb.2016.00727

2014

Marcus Stöckel, Tamara Těšitelová, Jana Jersáková, Martin I. Bidartondo, Gerhard Gebauer: Carbon and nitrogen gain during the growth of orchid seedlings in nature. In: New Phytologist, 202 (2014). - S. 606-615.
doi:10.1111/nph.12688

Juyoung Seo, Inyoung Jang, Gerhard Gebauer, Hojeong Kang: Abundance of Methanogens, Methanotrophic Bacteria, and Denitrifiers in Rice Paddy Soils. In: Wetlands, 34 (2014). - S. 213-223.
doi:10.1007/s13157-013-0477-y

2013

Sina Berger, Inyoung Jang, Juyoung Seo, Hojeong Kang, Gerhard Gebauer: A record of N2O and CH4 emissions and underlying soil processes of Korean rice paddies as affected by different water management practices. In: Biogeochemistry, 115 (2013). - S. 317-332.
doi:10.1007/s10533-013-9837-1

Sina Berger, Youngsun Kim, Janine Kettering, Gerhard Gebauer: Plastic mulching in agriculture - friend or foe of N₂O emissions?. In: Agriculture, Ecosystems & Environment, 167 (2013). - S. 43-51.
doi:10.1016/j.agee.2013.01.010

Nicole A. Hynson, Thomas P. Madsen, Marc-André Selosse, Iris K. U. Adam, Yuki Ogura-Tsujita, Melanie Roy, Gerhard Gebauer: The Physiological Ecology of Mycoheterotrophy. In: Merckx, Vincent (Hrsg.): Mycoheterotrophy : the biology of plants living on fungi. - New York : Springer, 2013. - S. 297-342.
doi:10.1007/978-1-4614-5209-6_8

Sina Berger, Eun-Young Jung, Julia Köpp, Hojeong Kang, Gerhard Gebauer: Monsoon rains, drought periods and soil texture as drivers of soil N2O fluxes - soil drought turns East Asian temperate deciduous forest soils into temporary and unexpectedly persistent N2O sinks. In: Soil Biology & Biochemistry, 57 (2013). - S. 273-281.
doi:10.1016/j.soilbio.2012.09.026

Nicole A. Hynson, Michael Weiß, Katja Preiß, Gerhard Gebauer, Kathleen K. Treseder: Fungal host specificity is not a bottleneck for the germination of Pyroleae species (Ericaceae) in a Bavarian forest. In: Molecular Ecology, 22 (2013). - S. 1473-1481.
doi:10.1111/mec.12180

2012

Florian Menzel, Michael Staab, Arthur Y. C. Chung, Gerhard Gebauer, Nico Blüthgen: Trophic ecology of parabiotic ants: Do the partners have similar food niches?. In: Austral Ecology, 37 (2012). - S. 537-546.
doi:10.1111/j.1442-9993.2011.02290.x

Byung-Joon Jung, Hyun-Ju Lee, Jong-Jin Jeong, Jeffrey Owen, Bomchul Kim, Katrin Meusburger, Christine Alewell, Gerhard Gebauer, Christopher L. Shope, Ji-Hyung Park: Storm pulses and varying sources of hydrologic carbon export from a mountainous watershed. In: Journal of Hydrology, 440-441 (2012). - S. 90-101.
doi:10.1016/j.jhydrol.2012.03.030

Janine Sommer, Johanna Pausch, Mark C. Brundrett, Kingsley W. Dixon, Martin I. Bidartondo, Gerhard Gebauer: Limited carbon and mineral nutrient gain from mycorrhizal fungi by adult Australian orchids. In: American Journal of Botany, 99 (2012). - S. 1133-1145.
doi:10.3732/ajb.1100575

Daniel Puppe, Stefan Schrader, Anette Giesemann, Gerhard Gebauer: Isotopic labelling of enchytraeids under FACE conditions: A possible way to analyse the residue-enchytraeid-soil system considering elevated atmospheric CO2 concentrations. In: Landbauforschung / Sonderheft, 357 (2012). - S. 21-26.

2011

Heiko T. Liebel, Gerhard Gebauer: Stable isotope signatures confirm carbon and nitrogen gain through ectomycorrhizas in the ghost orchid Epipogium aphyllum Swartz. In: Plant Biology, 13 (2011). - S. 270-275.
doi:10.1111/j.1438-8677.2010.00369.x

Mariangela Girlanda, Rossana Segreto, Donata Cafasso, Heiko T. Liebel, Michele Rodda, Enrico Ercole, Salvatore Cozzolino, Gerhard Gebauer, Silvia Perotto: Photosynthetic Mediterranean meadow orchids feature partial mycoheterotrophy and specific mycorrhizal associations. In: American Journal of Botany, 98 (2011). - S. 1148-1163.
doi:10.3732/ajb.1000486

Richard J. Waterman, Martin I. Bidartondo, Jaco Stofberg, Julie K. Combs, Gerhard Gebauer, Vincent Savolainen, Timothy G. Barraclough, Anton Pauw: The effects of above and below ground mutualisms on orchid speciation and co-existence. In: The American Naturalist, 177 (2011). - S. E54-E68.
doi:10.1086/657955

Marcus Stöckel, Cornelia Meyer, Gerhard Gebauer: The degree of mycoheterotrophic carbon gain in green, variegated and vegetative albino individuals of Cephalanthera damasonium is related to leaf chlorophyll concentrations. In: New Phytologist, 189 (2011). - S. 790-796.
doi:10.1111/j.1469-8137.2010.03510.x

2010

Heike Feldhaar, Gerhard Gebauer, Nico Blüthgen: Stable isotopes: past and future in exposing secrets of ant nutrition (Hymenoptera: Formicidae). In: Myrmecological News, 13 (2010). - S. 3-13.

Stefanie D. Goldberg, Werner Borken, Gerhard Gebauer: N2O emission in a Norway spruce forest due to soil frost : Concentration and isotope profiles shed a new light on an old story. In: Biogeochemistry, 97 (2010). - S. 21-30.
doi:10.1007/s10533-009-9294-z

Jochen H. Bihn, Gerhard Gebauer, Roland Brandl: Loss of functional diversity of ant assemblages in secundary tropical forests. In: Ecology, 91 (2010). - S. 782-792.
doi:10.1890/08-1276.1

Katja Preiß, Iris K. U. Adam, Gerhard Gebauer: Irradiance governs exploitation of fungi: fine-tuning of carbon gain by two partially myco-heterotrophic orchids. In: Proceedings of the Royal Society B: Biological Sciences, 277 (2010). - S. 1333-1336.
doi:10.1098/rspb.2009.1966

Stefanie D. Goldberg, Klaus-Holger Knorr, Christian Blodau, Gunnar Lischeid, Gerhard Gebauer: Impact of altering the water table height of an acidic fen on N2O and NO fluxes and soil concentrations. In: Global Change Biology, 16 (2010). - S. 220-233.
doi:10.1111/j.1365-2486.2009.02015.x

Heiko T. Liebel, Martin I. Bidartondo, Katja Preiß, Rossana Segreto, Marcus Stöckel, Michele Rodda, Gerhard Gebauer: C and N stable isotope signatures reveal constraints to nutritional modes in orchids from the Mediterranean and Macaronesia. In: American Journal of Botany, 97 (2010). - S. 903-912.
doi:10.3732/ajb.0900354

Vincent Merckx, Marcus Stöckel, Andreas Fleischmann, Thomas D. Bruns, Gerhard Gebauer: 15N and 13C natural abundance of two mycoheterotrophic and a putative partially mycoheterotrophic species associated with arbuscular mycorrhizal fungi. In: New Phytologist, 188 (2010). - S. 590-596.
doi:10.1111/j.1469-8137.2010.03365.x

2009

Heiko T. Liebel, Katja Preiß, Gerhard Gebauer: Partiell mykoheterotrofi hos norske vintergrønnarter – relevans for vernetiltak overfor truede arter. In: Blyttia, 67 (2009). - S. 138-143.

Stefanie D. Goldberg, Gerhard Gebauer: N2O and NO fluxes between a Norway spruce forest soil and atmosphere as affected by prolonged summer drought. In: Soil Biology & Biochemistry, 41 (2009). - S. 1986-1995.
doi:10.1016/j.soilbio.2009.07.001

Nicole A. Hynson, Katja Preiß, Gerhard Gebauer, Thomas D. Bruns: Isotopic evidence of full and partial myco-heterotrophy in the plant tribe Pyroleae (Ericaceae). In: New Phytologist, 182 (2009). - S. 719-726.
doi:10.1111/j.1469-8137.2009.02781.x

Nicole A. Hynson, Katja Preiß, Gerhard Gebauer: Is it better to give than receive? A stable isotope perspective to orchid-fungal carbon transport in the green orchid species Goodyera repens and Goodyera oblongifolia. In: New Phytologist, 182 (2009). - S. 8-11.
doi:10.1111/j.1469-8137.2009.02778.x

Yuki Ogura-Tsujita, Gerhard Gebauer, Toshimasa Hashimoto, Hidetaka Umata, Tomohisa Yukawa: Evidence for novel and specialised mycorrhizal parasitism: the orchid Gastrodia confusa gains carbon from saprotrophic Mycena. In: Proceedings of the Royal Society B: Biological Sciences, 276 (2009). - S. 761-767.
doi:10.1098/rspb.2008.1225

Stefanie D. Goldberg, Gerhard Gebauer: Drought turns a Central European Norway spruce forest soil from an N2O source to a transient N2O sink. In: Global Change Biology, 15 (2009). - S. 850-860.
doi:10.1111/j.1365-2486.2008.01752.x

Duncan D. Cameron, Katja Preiß, Gerhard Gebauer, David J. Read: The chlorophyll-containing orchid Corallorhiza trifida derives little carbon through photosynthesis. In: New Phytologist, 183 (2009). - S. 358-364.
doi:10.1111/j.1469-8137.2009.02853.x

2008

Jan Muhr, Stefanie D. Goldberg, Werner Borken, Gerhard Gebauer: Repeated drying-rewetting cycles and their effects on the emission of CO2, N2O, NOx and CH4 in a forest soil. In: Journal of Plant Nutrition and Soil Science, 171 (2008). - S. 719-728.
doi:10.1002/jpln.200700302

Heiko T. Liebel, Marcus Stöckel, Katja Preiß, Gerhard Gebauer: Neue Erkenntnisse zur Lebensweise heimischer Orchideenarten - Relevanz für Artenschutzkonzepte. In: Berichte aus den Arbeitskreisen Heimische Orchideen, 25 (2008). - S. 172-179.

Stefanie D. Goldberg, Klaus-Holger Knorr, Gerhard Gebauer: N2O concentration and isotope signature along profiles provide deeper insight into the fate of N2O in soils. In: Isotopes in Environmental and Health Studies, 44 (2008). - S. 377-391.
doi:10.1080/10256010802507433

Katja Preiß, Gerhard Gebauer: A methodological approach to improve estimates of nutrient gains by partially myco-heterotrophic plants. In: Isotopes in Environmental and Health Studies, 44 (2008). - S. 393-401.
doi:10.1080/10256010802507458

Stefanie D. Goldberg, Jan Muhr, Werner Borken, Gerhard Gebauer: Fluxes of climate-relevant trace gases between a Norway spruce forest soil and atmosphere during repeated freeze-thaw cycles in mesocosms. In: Journal of Plant Nutrition and Soil Science, 171 (2008). - S. 729-739.
doi:10.1002/jpln.200700317

Katja Preiß, Cornelia Meyer, Gerhard Gebauer: The ectomycorrhizal specialist orchid Corallorhiza trifida is a partial myco-heterotroph. In: New Phytologist, 178 (2008). - S. 395-400.
doi:10.1111/j.1469-8137.2007.02362.x

2007

Katja Preiß, Nicole A. Hynson, Gerhard Gebauer, Edith B. Allen, Michael F. Allen, David J. Read: Wide geographical and ecological distribution of nitrogen and carbon gains from fungi in pyroloids and monotropoids (Ericaceae) and in orchids. In: New Phytologist, 175 (2007). - S. 166-175.
doi:10.1111/j.1469-8137.2007.02065.x

Konrad Fiedler, Franziska Kuhlmann, B. C. Schlick-Steiner, F. M. Steiner, Gerhard Gebauer: Stable N-isotope signatures of central European ants - assessing positions in a trophic gradient. In: Insectes Sociaux, 54 (2007). - S. 393-402.
doi:10.1007/s00040-007-0959-0

2006

Jean-Claude Abadie, Ülle Püttsepp, Gerhard Gebauer, Antonella Faccio, Paola Bonfante, Marc-André Selosse: Cephalanthera longifolia (Neottieae, Orchidaceae) is mixotrophic: a comparative study between green and non-photosynthetic individuals. In: Canadian Journal of Botany, 84 (2006). - S. 1462-1477.
doi:10.1139/B06-101

2005

Gerhard Gebauer: Partnertausch im dunklen Wald - Stabile Isotope geben neue Einblicke in das Ernährungsverhalten von Orchideen. In: Auf Spurensuche in der Natur : stabile Isotope in der ökologischen Forschung ; Rundgespräch am 4. April 2005 in München. - München : Pfeil, 2005. - S. 55-67.

Thomas Julou, Bastian Burghardt, Gerhard Gebauer, Daniel Berveiller, Claire Damesin, Marc-André Selosse: Mixotrophy in orchids: insights from a comparative study of green individuals and nonphotosynthetic individuals of Cephalanthera damasonium. In: New Phytologist, 166 (2005). - S. 639-653.
doi:10.1111/j.1469-8137.2005.01364.x

2004

A. F. S. Taylor, Gerhard Gebauer, David J. Read: Uptake of nitrogen and carbon from double-labelled (15N and 13C) glycine by mycorrhizal pine seedlings. In: New Phytologist, 164 (2004). - S. 383-388.
doi:10.1111/j.1469-8137.2004.01164.x

Miriam Pinto, P. Merino, Augustin del Prado, J. M. Estavillo, Sirwan Yamulki, Gerhard Gebauer, Stefan Pietrzak, Jutta Lauf, Oene Oenema: Increased emissions of nitric oxide and nitrous oxide following tillage of a perennial pasture. In: Nutrient Cycling in Agroecosystems, 70 (2004). - S. 13-22.
doi:10.1023/B:FRES.0000049357.79307.23

Nicole Wrage, Jutta Lauf, Augustin del Prado, Miriam Pinto, Stefan Pietrzak, Sirwan Yamulki, Oene Oenema, Gerhard Gebauer: Distinguishing sources of N₂O in European grasslands by stable isotope analysis. In: Rapid Communications in Mass Spectrometry, 18 (2004). - S. 1201-1207.
doi:10.1002/rcm.1461

Martin I. Bidartondo, Bastian Burghardt, Gerhard Gebauer, Thomas D. Bruns, David J. Read: Changing partners in the dark: Isotopic and molecular evidence of ectomycorrhizal liaisons between forest orchids and trees. In: Proceedings of the Royal Society B: Biological Sciences, 271 (2004). - S. 1799-1806.
doi:10.1098/rspb.2004.2807

2003

Oleg V. Menyailo, Bruce A. Hungate, Johannes Lehmann, Gerhard Gebauer, Wolfgang Zech: Tree species of the central amazon and soil moisture alter stable isotope composition of nitrogen and oxygen in nitrous oxide evolved from soil. In: Isotopes in Environmental and Health Studies, 39 (2003). - S. 41-52.
doi:10.1080/1025601031000096745

Harald Dinkelmeyer, Johannes Lehmann, Andreas Renck, Lucerina Trujillo, Jose Pereira da Silva Jr., Gerhard Gebauer, Klaus Kaiser: Nitrogen uptake from 15N-enriched fertilizer by four tree crops in an Amazonian agroforest. In: Agroforestry Systems, 57 (2003). - S. 213-224.
doi:10.1023/A:1024824108549

Jens Tilsner, Nicole Wrage, Jutta Lauf, Gerhard Gebauer: Emission of gaseous nitrogen oxides from an extensively managed grassland in NE Bavaria, Germany. II. Stable isotope natural abundance of N₂O. In: Biogeochemistry, 63 (2003). - S. 249-267.
doi:10.1023/A:1023316315550

Jens Tilsner, Nicole Wrage, Jutta Lauf, Gerhard Gebauer: Emission of gaseous nitrogen oxides from an extensively managed grassland in NE Bavaria, Germany. I. Annual budgets of N₂O and NOₓ emissions. In: Biogeochemistry, 63 (2003). - S. 229-247.
doi:10.1023/A:1023365432388

Nico Blüthgen, Gerhard Gebauer, Konrad Fiedler: Disentangling a rainforest food web using stable isotopes: dietary diversity in a species-rich ant community. In: Oecologia, 137 (2003). - S. 426-435.
doi:10.1007/s00442-003-1347-8

Gerhard Gebauer, M. Meyer: 15N and 13C natural abundance of autotrophic and mycoheterotrophic orchids provides insight into nitrogen and carbon gain from fungal association. In: New Phytologist, 160 (2003). - S. 209-223.
doi:10.1046/j.1469-8137.2003.00872.x

2002

J. M. Estavillo, P. Merino, Miriam Pinto, Sirwan Yamulki, Gerhard Gebauer, A. Sapek, W. Corré: Short term effect of ploughing a permanent pasture on N₂O production from nitrification and denitrification. In: Plant and Soil, 239 (2002). - S. 253-265.
doi:10.1023/A:1015062304915

Johannes Lehmann, Gerhard Gebauer, Wolfgang Zech: Nitrogen cycling assessment in a hedgerow intercropping system using 15N enrichment. In: Nutrient Cycling in Agroecosystems, 62 (2002). - S. 1-9.
doi:10.1023/A:1015403922358

2001

Jutta Lauf, Gerhard Gebauer: On-line analysis of nitrogen stable isotopes in NO from ambient air samples. In: Analytical Chemistry, 73 (2001). - S. 1126-1133.
doi:10.1021/ac0009292

2000

Gerhard Gebauer: The use of stable isotopes to study the fate of nitrogen inputs to forest ecosystems. In: Maria A. Martins-Loução (Hrsg.): Nitrogen in a sustainable ecosystem : from the cell to the plant. - Leiden : 2000. - S. 317-327.

G. L. Velthof, J. W. van Groenigen, Gerhard Gebauer, Stefan Pietrzak, S. C. Jarvis, Miriam Pinto, W. Corré, Oene Oenema: Temporal stability of spatial patterns of nitrous oxide fluxes from sloping grassland. In: Journal of Environmental Quality, 29 (2000). - S. 1397-1407.
doi:10.2134/jeq2000.00472425002900050005x

Johannes Lehmann, Jose Pereira da Silva Jr., Götz Schroth, Gerhard Gebauer, Luciana Ferreira da Silva: Nitrogen use in mixed tree crop plantations with a legume cover crop. In: Plant and Soil, 225 (2000). - S. 63-72.
doi:10.1023/A:1026580127965

Gerhard Gebauer, B. Zeller, Gisela Schmidt, Christoph May, Nina Buchmann, M. Colin-Belgrand, E. Dambrine, F. Martin, Ernst-Detlef Schulze, Pierre Bottner: The Fate of 15N-Labelled Nitrogen Inputs to Coniferous and Broadleaf Forests. In: Ernst-Detlef Schulze (Hrsg.): Carbon and Nitrogen Cycling in European Forest Ecosystems. - Berlin : Springer, 2000. - S. 144-170.
doi:10.1007/978-3-642-57219-7_7

Gerhard Gebauer, Jutta Lauf, Christoph May, Jens Tilsner, B. Sapek, A. Sapek: Effects of type and amount of nitrogen fertiliser application and of liming on 15N abundance and total nitrogen concentrations in the soil and vegetation of grassland in Poland. In: O. Oenema, A. Sapek (Hrsg.): Effects of liming and nitrogen fertilizer application on soil acidity and gaseous nitrogen oxide emissions in grassland systems. - Raszyn, Poland : 2000. - S. 84-95.

A. F. Harrison, Ernst-Detlef Schulze, Gerhard Gebauer, Gabriele Bruckner: Canopy uptake and utilisation of atmospheric pollutant Nitrogen. In: Ernst-Detlef Schulze (Hrsg.): Carbon and Nitrogen Cycling in European Forest Ecosystems. - Berlin : 2000. - S. 171-188.

G. A. Bauer, Gerhard Gebauer, A. F. Harrison, P. Högberg, L. Högbom, H. Schinkel, A. F. S. Taylor, Martin Novak, D. Harkness, T. Persson, Ernst-Detlef Schulze: Biotic and abiotic controls over ecosystem cycling of stable natural nitrogen, carbon and sulphur isotopes. In: Ernst-Detlef Schulze (Hrsg.): Carbon and nitrogen cycling in European forest ecosystems. - Berlin : 2000. - S. 189-214.

1999

Johannes Lehmann, T. Feilner, Gerhard Gebauer, Wolfgang Zech: Nitrogen uptake of sorghum (Sorghum bicolor L.) from tree mulch and mineral fertilizer under high leaching conditions estimated by nitrogen-15 enrichment. In: Biology and Fertility of Soils, 30 (1999). - S. 90-95.
doi:10.1007/s003740050592

Gerhard Gebauer, A. F. S. Taylor: 15N natural abundance in fruit bodies of different functional groups of fungi in relation to substrate utilization. In: New Phytologist, 142 (1999). - S. 93-101.
doi:10.1046/j.1469-8137.1999.00373.x

Bernhard Kalusche, Jutta Verscht, Gerhard Gebauer, Ewald Komor, Axel Haase: Sucrose unloading in the hypocotyl of the Ricinus communis L. seedling measured by 13C-nuclear magnetic resonance spectroscopy in vivo. In: Planta, 208 (1999). - S. 358-364.
doi:10.1007/s004250050570

Johannes Lehmann, Doris Weigl, Inka Peter, Klaus Droppelmann, Gerhard Gebauer, Heiner Goldbach, Wolfgang Zech: Nutrient interactions of alley cropped Sorghum bicolor and Acacia saligna in a runoff irrigation system in Northern Kenya. In: Plant and Soil, 210 (1999). - S. 249-262.
doi:10.1023/A:1004698403770

1998

Jutta Lauf, Gerhard Gebauer: On-line analysis of stable isotopes of nitrogen in NH₃, NO and NO₂ at natural abundance levels. In: Analytical Chemistry, 70 (1998). - S. 2750-2756.
doi:10.1021/ac9800053

Gerhard Gebauer, G. Hahn, H. Rodenkirchen, M. Zuleger: Effects of acid irrigation and liming on nitrate reduction and nitrate content of Picea abies (L.) Karst. and Oxalis acetosella L.. In: Plant and Soil, 199 (1998). - S. 59-70.
doi:10.1023/A:1004263223917

Oene Oenema, Gerhard Gebauer, M. Rodriguez, A. Sapek, S. C. Jarvis, W. Corré, Sirwan Yamulki: Controlling nitrous oxide emissions from grassland livestock production systems. In: Nutrient Cycling in Agroecosystems, 52 (1998). - S. 141-149.
doi:10.1023/A:1009732226587

Johannes Lehmann, Inka Peter, Claudia Steglich, Gerhard Gebauer, Bernd Huwe, Wolfgang Zech: Below-ground interactions in dryland agroforestry. In: Forest Ecology and Management, 111 (1998). - S. 157-169.
doi:10.1016/S0378-1127(98)00322-3

B. Setzer, Gerhard Gebauer, Hans Mohr: Die Bedeutung der Kaliumversorgung für Aufnahme und Assimilation von [15N-]Nitrat und [15N-]Ammonium durch Keimpflanzen der Kiefer (Pinus sylvestris). In: Allgemeine Forst- und Jagdzeitung, 169 (1998). - S. 76-80.

1997

Gerhard Gebauer, Ernst-Detlef Schulze: Nitrate nutrition of Central European forest trees. In: Heinz Rennenberg (Hrsg.): Trees : contributions to modern tree physiology. - Leiden : Backhuys, 1997. - S. 273-291.

Klaus Jung, Gerhard Gebauer, Matthias Gehre, Diana Hofmann, Ludwig Weißflog, Gerrit Schüürmann: Anthropogenic impacts on natural nitrogen isotope variations in Pinus sylvestris stands in an industrially polluted area. In: Environmental Pollution, 97 (1997). - S. 175-181.
doi:10.1016/S0269-7491(97)00053-5

1996

Gerhard Gebauer: Zum Stand der Waldschadensdiskussion. In: Wolfgang Barz (Hrsg.): Umwelt und Verkehr : Symposium am 19. und 20. Juni 1995 in Münster. - Landsberg : ecomed, 1996. - S. 43-60.

Gisela Schmidt, Christoph May, Gerhard Gebauer, Ernst-Detlef Schulze: Uptake of [15N] Ammonium and [15N]Nitrate in a 140-Year-Old Spruce Stand (Picea abies) in the Fichtelgebirge (NE Bavaria). In: Isotopes in Environmental and Health Studies, 32 (1996). - S. 141-148.
doi:10.1080/10256019608036305

Nina Buchmann, Gerhard Gebauer, Ernst-Detlef Schulze: Partitioning of 15N-labeled ammonium and nitrate among soil, litter, below- and above-ground biomass of trees and understory in a 15-year-old Picea abies plantation. In: Biogeochemistry, 33 (1996). - S. 1-23.
doi:10.1007/BF00000967

Christoph May, Gisela Schmidt, Gerhard Gebauer, Ernst-Detlef Schulze: The Fate of [15N]Ammonium and [15N]Nitrate in the Soil of a 140-Year-Old Spruce Stand (Picea Abies) in the Fichtelgebirge (NE-Bavaria). In: Isotopes in Environmental and Health Studies, 32 (1996). - S. 149-158.
doi:10.1080/10256019608036306

1995

Walter Durka, Ernst-Detlef Schulze, Gerhard Gebauer, S. Voerkelius: Origin of nitrate in forest spring water: evidence from natural isotope ratios of NO3-d15N and NO3-d18O. In: Isotopes in Environmental and Health Studies, 31 (1995). - S. 386-387.
doi:10.1080/10256019508036286

Walter Durka, Ernst-Detlef Schulze, Gerhard Gebauer, S. Voerkelius: Nachweis von atmosphärischem Nitrat im Abfluß aus Waldökosystemen mit Hilfe natürlicher Isotopenverhältnisse. In: Internationales Symposium Grundwasserversauerung durch Atmosphärische Deposition - Ursachen, Auswirkungen, Sanierungsstrategien. - München : Bayerisches Landesamt für Wasserwirtschaft, 1995. - S. 81-84.

Nina Buchmann, Ernst-Detlef Schulze, Gerhard Gebauer: 15N-ammonium and 15N-nitrate uptake of a 15-year-old Picea abies plantation. In: Oecologia, 102 (1995). - S. 361-370.
doi:10.1007/BF00329803

1994

Walter Durka, Ernst-Detlef Schulze, Gerhard Gebauer, S. Voerkelius: Effects of forest decline on uptake and leaching of deposited nitrate determined from ¹⁵N and ¹⁸O measurements. In: Nature, 372 (1994). - S. 765-767.
doi:10.1038/372765a0

H. Rehder, M. Gökceoǧlu, Gerhard Gebauer, G. Güleryüz: Die Vegetation des Uludaǧ-Gebirges (Anatolien). In: Phytocoenologia, 24 (1994). - S. 167-192.
doi:10.1127/phyto/24/1994/167

Ernst-Detlef Schulze, F. S. Chapin III, Gerhard Gebauer: Nitrogen nutrition and isotope differences among life forms at the northern treeline of Alaska. In: Oecologia, 100 (1994). - S. 406-412.
doi:10.1007/BF00317862

Gerhard Gebauer, Anette Giesemann, Ernst-Detlef Schulze, Hans-Jürgen Jäger: Isotope ratios and concentrations of sulfur and nitrogen in needles and soils of "Picea abies" stands as influenced by atmospheric deposition of sulfur and nitrogen compounds. In: Plant and Soil, 164 (1994). - S. 267-281.
doi:10.1007/BF00010079

1993

K. Widmann, Gerhard Gebauer, H. Rehder, H. Ziegler: Fluctuations in nitrate reductase activity, and organic nitrogen concentrations of succulent plants under different nitrogen and water regimes. In: Oecologia, 94 (1993). - S. 146-152.
doi:10.1007/BF00317316

Gabriele Bruckner, Gerhard Gebauer, Ernst-Detlef Schulze: Uptake of ¹⁵NH₃ by "Picea abies" in closed chamber experiments. In: Isotopes in Environmental and Health Studies, 29 (1993). - S. 71-76.
doi:10.1080/10256019308046137

Walter Durka, Gabriele Bruckner, Gerhard Gebauer: Probenpräparation von Nitrat aus komplexen Matrices zur Messung der N- und O-Isotopenverhältnisse. In: Isotopes in Environmental and Health Studies, 29 (1993). - S. 197.

Gerhard Gebauer, Petra Dietrich: Nitrogen isotope ratios in different compartments of a mixed stand of spruce, larch and beech trees and of understorey vegetation including fungi. In: Isotopes in Environmental and Health Studies, 29 (1993). - S. 35-44.
doi:10.1080/10256019308046133

Doris Koppisch, Ernst-Detlef Schulze, Gerhard Gebauer: ¹⁵N-labelled ammonium and nitrate uptake by the grass "Calamagrostis villosa". In: Isotopes in Environmental and Health Studies, 29 (1993). - S. 77-84.
doi:10.1080/10256019308046138

Gabriele Bruckner, Ernst-Detlef Schulze, Gerhard Gebauer: ¹⁵N labelled NH₃ uptake experiments and their relation to natural conditions. In: J. Slanina, G. Angeletti (Hrsg.): General assessment of biogenic emissions and deposition of nitrogen compounds, sulphur compounds and oxidants in Europe. - Brüssel : Guyot, 1993. - S. 321-327.

E. Winkler, Gerhard Gebauer: Investigations on the nitrogen metabolism of forest trees by mathematical modelling of natural isotope ratios. In: Isotopes in Environmental and Health Studies, 29 (1993). - S. 199-214.
doi:10.1080/00211919308046687

Gisela Schmidt, Gerhard Gebauer, K. Widmann, H. Ziegler: Influence of nitrogen supply and temperature on stable carbon isotope ratios in plants of different photosynthetic pathways (C₃, C₄, CAM). In: Isotopes in Environmental and Health Studies, 29 (1993). - S. 9-13.
doi:10.1080/10256019308046129

Jutta Stadler, Gerhard Gebauer, Ernst-Detlef Schulze: The influence of ammonium on nitrate uptake and assimilation in 2-year-old ash and oak trees - a tracer study with 15N. In: Isotopes in Environmental and Health Studies, 29 (1993). - S. 85-92.
doi:10.1080/10256019308046139

Gabriele Bruckner, Ernst-Detlef Schulze, Gerhard Gebauer: Atmosphärische Stickstoffeinträge und Stickstoffaufnahme in Fichtenbeständen Nordbayerns. In: Kirchner, Manfred (Hrsg.): Proceedings : Internationales Symposium Stoffeinträge aus der Atmosphäre und Waldbodenbelastung in den Ländern von ARGE ALP und ALPEN-ADRIA. - Neuherberg : GSF-Forschungszentrum für Umwelt und Gesundheit, 1993. - S. 284-293.

Nina Buchmann, Gerhard Gebauer, Ram Oren, Ernst-Detlef Schulze: 15N-application to a 12-year-old Norway spruce plantation in the Fichtelgebirge, NE-Bavaria, FRG - Pathways and Dynamics.. In: Experimental manipulations of biota and biogeochemical cycling in ecosystems : approach, methodologies, findings ; proceedings of a symposium jointly organized by Commission of the European Communities. - Brussels : Guyot, 1993. - S. 173-181.

1992

Jutta Stadler, Gerhard Gebauer: Nitrate reduction and nitrate content in ash trees (Fraxinus excelsior L.) : distribution between compartments, site comparison and seasonal variation. In: Trees, 6 (1992). - S. 236-240.
doi:10.1007/BF00224342

Nina Buchmann, Ram Oren, Gerhard Gebauer, Ernst-Detlef Schulze: The use of stable isotopes in ecosystem research : first results of a field study with ¹⁵N. In: Isotopes in Environmental and Health Studies, 28 (1992). - S. 51-59.
doi:10.1080/00211919208050821

1991

Ernst-Detlef Schulze, Otto L. Lange, H. Ziegler, Gerhard Gebauer: Carbon and nitrogen isotope ratios of mistletoes growing on nitrogen and non-nitrogen fixing hosts and on CAM plants in the Namib desert confirm partial heterotrophy. In: Oecologia, 88 (1991). - S. 457-462.
doi:10.1007/BF00317706

Ernst-Detlef Schulze, Gerhard Gebauer, H. Ziegler, Otto L. Lange: Estimates of nitrogen fixation by trees on an aridity gradient in Namibia. In: Oecologia, 88 (1991). - S. 451-455.
doi:10.1007/BF00317592

Ernst-Detlef Schulze, Gerhard Gebauer, W. Schulze, J. S. Pate: The utilization of nitrogen from insect capture by different growth forms of "Drosera" from Southwest Australia. In: Oecologia, 87 (1991). - S. 240-246.
doi:10.1007/BF00325262

Gerhard Gebauer, Ernst-Detlef Schulze: Carbon and nitrogen isotope ratios in different compartments of a healthy and a declining "Picea abies" forest in the Fichtelgebirge, NE Bavaria. In: Oecologia, 87 (1991). - S. 198-207.
doi:10.1007/BF00325257

Gerhard Gebauer: Waldschadensforschung im Fichtelgebirge. In: Reuther, Markus (Hrsg.): Proceedings : Expertentagung "Waldschadensforschung im Östlichen Mitteleuropa und in Bayern", 13. - 15.11.1990 in Schloss Neuburg/Inn bei Passau. - Neuherberg : GSF-Forschungszentrum für Umwelt und Gesundheit, 1991. - S. 154-167.

Gerhard Gebauer, C. Katz, Ernst-Detlef Schulze: Uptake of gaseous and liquid nitrogen depositions and influence on the nutritional status of Norway spruce. In: Hantschel, Ralph ; Beese, Fritz(Hrsg.): Effects of forest management on the nitrogen-cycle with respect to changing environmental conditions : proceedings ; 9 - 13. Mai 1990. - Neuherberg : GSF-Forschungszentrum für Umwelt und Gesundheit, 1991. - S. 83-92.

Gerhard Gebauer, Ernst-Detlef Schulze: Natürliche C- und N-Isotopenverhältnisse in verschiedenen Kompartimenten gesunder ung geschädigter Fichtenbestände. In: Reuther, Markus (Hrsg.): 2. Statusseminar der PBWU zum Forschungsschwerpunkt "Waldschäden" : Proceedings, 4.- 6. Februar 1991. - Neuherberg : GSF-Forschungszentrum für Umwelt und Gesundheit, 1991. - S. 283-299.

Gerhard Gebauer: Natural nitrogen isotope ratios in different compartments of Norway spruce from a healthy and a declining stand (IAEA-SM-313/56). In: Stable isotopes in plant nutrition, soil fertility and environmental studies : Proceedings of an International Symposium on the Use of Stable Isotopes in Plant Nutrition, Soil Fertility and Environmental Studies, jointly organized by the International Atomic Energy Agency and the Food and Agriculture Organization of the United Nations and held in Vienna, 1 - 5 October 1990. - Wien : IAEA, 1991. - S. 131-138.

Gabriele M. Kisser-Priesack, Gerhard Gebauer: Kinetics of 15NOx uptake by plant cuticles. In: Stable isotopes in plant nutrition, soil fertility and environmental studies : Proceedings of an International Symposium on the Use of Stable Isotopes in Plant Nutrition, Soil Fertility and Environmental Studies jointly organized by the International Atomic Energy Agency and the Food and Agriculture Organization of the United Nations and held in Vienna, 1 - 5 October 1990. - Wien : IAEA, 1991. - S. 619-625.

1990

K. Widmann, Gerhard Gebauer, H. Rehder, H. Ziegler: Biomass production and nitrogen contents of the CAM plants "Kalanchoe daigremontiana" and "K. tubiflora" in cultures with different nitrogen and water supply. In: Oecologia, 82 (1990). - S. 478-483.
doi:10.1007/BF00319789

C. Katz, Gerhard Gebauer, Ernst-Detlef Schulze: Uptake of 15NOx in relation to the ambient gas concentration and the nutrition of Picea abies (L.) Karst. trees. In: Hans-Dieter Payer (Hrsg.): Environmental Research with Plants in Closed Chambers : proceedings of an international symposium jointly organised by the Commission of the European Communities. - Brüssel : 1990. - S. 347-351.

Gerhard Gebauer, Jutta Stadler: Nitrate assimilation and nitrate content in different organs of ash trees (Fraxinus excelsior). In: Marinus L. van Beusichem (Hrsg.): Plant Nutrition - Physiology and Applications : proceedings of the eleventh International Plant Nutrition Colloquium, 30 July - 4 August 1989, Wageningen, The Netherlands. - Dordrecht : Kluwer, 1990. - S. 101-106.

Gerhard Gebauer: Diurnal changes of nitrate content and nitrate reductase activity in different organs of Atriplex hortensis (C3 plant) and Amaranthus retroflexus (C4 plant). In: Marinus L. van Beusichem (Hrsg.): Plant Nutrition - Physiology and Applications : proceedings of the eleventh International Plant Nutrition Colloquium, 30 July - 4 August 1989, Wageningen, The Netherlands. - Dordrecht : Kluwer, 1990. - S. 93-99.

1989

Ernst-Detlef Schulze, Gerhard Gebauer: Aufnahme, Abgabe und Umsatz von Stickoxiden, NH4+ und Nitrat bei Waldbäumen, insbesondere der Fichte. In: 1. Statusseminar der PBWU zum Forschungsschwerpunkt "Waldschäden". - Neuherberg : 1989. - S. 119-133.

1988

Gerhard Gebauer, H. Rehder, B. Wollenweber: Nitrate, nitrate reduction and organic nitrogen in plants from different ecological and taxonomic groups of Central Europe. In: Oecologia, 75 (1988). - S. 371-385.
doi:10.1007/BF00376940

Gerhard Gebauer, Ernst-Detlef Schulze: Forest decline of spruce as a result of nutrient imbalance and nutrient stress. In: Environmental aspects of applied biology : 19 – 21 September 1988, University of York, England. - Wellesbourne, Warwick : AAB Office, Inst. of Horticultural Research, 1988. - S. 123-130.

Gerhard Gebauer: Carbon, nitrogen and water use of C₃, C₄ and CAM plants : comparative aspects. In: F. Tognoni, G. Serra (Hrsg.): Symposium on Biological Aspects on Energy Saving in Protected Cultication : Pisa, Italy, Sept. 8 - 11, 1987. - Wageningen : ISHS, 1988. - S. 73-84.
doi:10.17660/ActaHortic.1988.229.7

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