气候变化领域集成服务门户(CCPortal): Nitrate is an important nitrogen source for Arctic tundra plants

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DOI	10.1073/pnas.1715382115
	Nitrate is an important nitrogen source for Arctic tundra plants
	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.
发表日期	2018
ISSN	0027-8424
起始页码	3398
结束页码	3403
卷号	115 期号:13
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.
英文关键词	Arctic tundra plants; Nitrogen dynamics; Plant nitrate; Soil nitrate; Stable isotopes
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159051
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 Bio...
推荐引用方式 GB/T 7714	Liu X.-Y.,Koba K.,Koyama L.A.,et al. Nitrate is an important nitrogen source for Arctic tundra plants[J],2018,115(13).
APA	Liu X.-Y..,Koba K..,Koyama L.A..,Hobbie S.E..,Weiss M.S..,...&Liu C.-Q..(2018).Nitrate is an important nitrogen source for Arctic tundra plants.Proceedings of the National Academy of Sciences of the United States of America,115(13).
MLA	Liu X.-Y.,et al."Nitrate is an important nitrogen source for Arctic tundra plants".Proceedings of the National Academy of Sciences of the United States of America 115.13(2018).