THE EFFECT OF OXYGEN DEPRIVATION ON INORGANIC NITROGEN UPTAKE IN AN ANTARCTIC MACROLICHEN |
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| Institution: | 1. USDA, Agricultural Research Service, Grazinglands Research Laboratory, El Reno, OK 73036, USA;2. Oklahoma State University, Department of Plant and Soil Sciences, Stillwater, OK 74078, USA;1. Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion 84990, Israel;2. School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA;3. Department of Natural Resources and Agronomy, Gilat Research Center, Agriculture Research Organization, Mobile Post Negev 85280, Israel;1. CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, No. 72 Wenhua Road, Shenyang 110016, China;2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Geographical Sciences, Northeast Normal University, Changchun 130024, China;1. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, PR China;2. Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China;3. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China;1. Institute of Botany, The Czech Academy of Sciences, Dukelská 135, T?eboň, 379 01 Czech Republic;2. Institute of Hydrobiology, Biology Centre v.v.i., The Czech Academy of Sciences, Na Sádkách 7, ?eské Budějovice 370 05, Czech Republic;3. Department of Forest Ecology, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Kamýcká 129, CZ-165 00 Prague 6 – Suchdol, Czech Republic;4. Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, Brani?ovská 1760, 370 05, ?eské Budějovice, Czech Republic;5. Department of Botany, Faculty of Science, University of South Bohemia, Na Zlaté stoce 1, 370 05, ?eské Budějovice, Czech Republic;6. Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan;1. Brandenburg University of Technology Cottbus-Senftenberg, Faculty of Environmental Sciences, Chair of Soil Protection and Recultivation, Konrad-Wachsmann-Allee 6, 03046 Cottbus, Germany;2. Leibniz-Institute for Agricultural Engineering Potsdam-Bornim e.V., Department of Horticultural Engineering, Max-Eyth-Allee 100, 14469 Potsdam, Germany;3. Brandenburg University of Technology Cottbus-Senftenberg, Central Analytical Laboratory, Konrad-Wachsmann-Allee 6, 03046 Cottbus, Germany;4. Technical University of Dresden, Department of Chemistry and Food Chemistry, Mommsenstraße 4, 01062 Dresden, Germany;5. University of Hohenheim, Institute of Botany—Experimental Ecology, Garbenstrasse 30, 70599 Stuttgart, Germany |
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| Abstract: | Snow meltwater containing 36 ng ml?1NO3?-N (raised here to between 95–101 ng ml?1NO3?-N) and 112 ng ml?1NH4+-N was sprayed onto illuminatedUsnea sphacelataat 2°C in a 2-1 capacity transparent perspex chamber force-ventilated with either air or O2- (and CO2-) free N2. The NO3-concentration in meltwater recirculated through a layer ofU. sphacelatafell toc. 8 ng ml?1after 1·25 h. Although the pattern of decline was broadly comparable in both air and N2, the initial rate of decline was lower in N2. When undepleted meltwater was continuously sprayed onto the lichen and the effluent collected for analysis, the lichen was found to retain 55% of the wet deposited NO3?in air but only 27% under N2. Up to 90% of NH4+supplied in a continuous spray of meltwater was retained by the lichen but this was affected little by O2and CO2deprivation. |
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