globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1715382115
论文题名:
Nitrate is an important nitrogen source for Arctic tundra plants
作者: Liu X.-Y.; Koba K.; Koyama L.A.; Hobbie S.E.; Weiss M.S.; Inagaki Y.; Shaver G.R.; Giblin A.E.; Hobara S.; Nadelhoffer K.J.; Sommerkorn M.; Rastetter E.B.; Kling G.W.; Laundre J.A.; Yano Y.; Makabe A.; Yano M.; Liu C.-Q.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:13
起始页码: 3398
结束页码: 3403
语种: 英语
英文关键词: Arctic tundra plants ; Nitrogen dynamics ; Plant nitrate ; Soil nitrate ; Stable isotopes
Scopus关键词: carbon ; nitrate ; nitrogen ; nitrogen 15 ; nitric acid derivative ; nitrogen ; arctic tundra ; Article ; denitrification ; nitrate leaching ; nitrogen fixation ; nonhuman ; phytoavailability ; plant ; plant tissue ; priority journal ; soil ; species composition ; chemistry ; growth, development and aging ; metabolism ; plant leaf ; tundra ; Denitrification ; Nitrates ; Nitrogen ; Plant Leaves ; Soil ; Tundra
英文摘要: Plant nitrogen (N) use is a key component of the N cycle in terrestrial ecosystems. The supply of N to plants affects community species composition and ecosystem processes such as photosynthesis and carbon (C) accumulation. However, the availabilities and relative importance of different N forms to plants are not well understood. While nitrate (NO3 −) is a major N form used by plants worldwide, it is discounted as a N source for Arctic tundra plants because of extremely low NO3 − concentrations in Arctic tundra soils, undetectable soil nitrification, and plant-tissue NO3 − that is typically below detection limits. Here we reexamine NO3 − use by tundra plants using a sensitive denitrifier method to analyze plant-tissue NO3 −. Soil-derived NO3 − was detected in tundra plant tissues, and tundra plants took up soil NO3 − at comparable rates to plants from relatively NO3 −-rich ecosystems in other biomes. Nitrate assimilation determined by15N enrichments of leaf NO3 − relative to soil NO3 − accounted for 4 to 52% (as estimated by a Bayesian isotope-mixing model) of species-specific total leaf N of Alaskan tundra plants. Our finding that in situ soil NO3 − availability for tundra plants is high has important implications for Arctic ecosystems, not only in determining species compositions, but also in determining the loss of N from soils via leaching and denitrification. Plant N uptake and soil N losses can strongly influence C uptake and accumulation in tundra soils. Accordingly, this evidence of NO3 − availability in tundra soils is crucial for predicting C storage in tundra. © 2018 National Academy of Sciences. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162302
Appears in Collections:气候变化与战略

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作者单位: Liu, X.-Y., Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China, Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, 183-8509, Japan, State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China; Koba, K., Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, 183-8509, Japan, Center for Ecological Research, Kyoto University, Shiga, 520-2113, Japan; Koyama, L.A., Department of Social Informatics, Graduate School of Informatics, Kyoto University, Kyoto, 606-8501, Japan; Hobbie, S.E., Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, MN 55108, United States; Weiss, M.S., Science Policy Exchange, Harvard Forest, Harvard University, Petersham, MA 01366, United States; Inagaki, Y., Shikoku Research Center, Forestry and Forest Products Research Institute, Kochi, 780-8077, Japan; Shaver, G.R., Ecosystems Center, Marine Biological Laboratory, Woods HoleMA 02543, United States; Giblin, A.E., Ecosystems Center, Marine Biological Laboratory, Woods HoleMA 02543, United States; Hobara, S., Department of Environmental and Symbiotic Science, Rakuno Gakuen University, Ebetsu, 069-8501, Japan; Nadelhoffer, K.J., Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, United States; Sommerkorn, M., World Wide Fund Global Arctic Programme, Oslo, 0130, Norway; Rastetter, E.B., Ecosystems Center, Marine Biological Laboratory, Woods HoleMA 02543, United States; Kling, G.W., Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, United States; Laundre, J.A., Ecosystems Center, Marine Biological Laboratory, Woods HoleMA 02543, United States; Yano, Y., Department of Ecology, Montana State University, Bozeman, MT 59717, United States; Makabe, A., Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, 183-8509, Japan, Project Team for Development of New-Generation Research Protocol for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, Yokosuka, 237-0061, Japan; Yano, M., Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, 183-8509, Japan, Center for Ecological Research, Kyoto University, Shiga, 520-2113, Japan; Liu, C.-Q., Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China, State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China

Recommended Citation:
Liu X.-Y.,Koba K.,Koyama L.A.,et al. Nitrate is an important nitrogen source for Arctic tundra plants[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(13)
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