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Nitrate is an important nitrogen source for Arctic tundra plants
Xue-Yan Liu;  Keisuke Koba;  Lina A. Koyama;  Sarah E. Hobbie;  Marissa S. Weiss;  Yoshiyuki Inagaki
2018
发表期刊Proceedings of the National Academy of Sciences of the United States of America
卷号115期号:13页码:3398-3403
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 photo-synthesis 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 by N-15 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.

收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8725
专题环境地球化学国家重点实验室
作者单位1.Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
2.Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
4.Center for Ecological Research, Kyoto University, Shiga 520-2113, Japan
5.Department of Social Informatics, Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan
6.Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, MN 55108
推荐引用方式
GB/T 7714
Xue-Yan Liu;Keisuke Koba;Lina A. Koyama;Sarah E. Hobbie;Marissa S. Weiss;Yoshiyuki Inagaki;. Nitrate is an important nitrogen source for Arctic tundra plants[J]. Proceedings of the National Academy of Sciences of the United States of America,2018,115(13):3398-3403.
APA Xue-Yan Liu;Keisuke Koba;Lina A. Koyama;Sarah E. Hobbie;Marissa S. Weiss;Yoshiyuki Inagaki;.(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),3398-3403.
MLA Xue-Yan Liu;Keisuke Koba;Lina A. Koyama;Sarah E. Hobbie;Marissa S. Weiss;Yoshiyuki Inagaki;."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):3398-3403.
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