期刊
ENVIRONMENTAL RESEARCH
卷 202, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2021.111787
关键词
Nitrogen use efficiency; Carbon flux; Nitrate; Ammonium; Deposition
资金
- Chinese Academy of Sciences Strategic Priority Research Program [XDA19020302]
- National Natural Science Foundation of China [31872690, 31570471]
- National Science and Technology Basic Resources Survey Program of China [2019FY0101304-1]
- National Postdoctoral Program for Innovative Talents [BX20180300]
- Postdoctoral Science Foundation of China [2019M650829]
Long-term atmospheric nitrogen deposition affects ecosystem productivity in terrestrial ecosystems in China. Different components of nitrogen deposition have varying effects on different ecosystems. N use efficiency of productivity induced by nitrogen deposition is influenced by precipitation and aridity index.
Long-term atmospheric nitrogen (N) deposition increases bioavailable N in terrestrial ecosystems, thereby influencing ecosystem productivity. However, how N deposition and its components (i.e., NO3- -N and NH4+-N) influence the spatial pattern of productivity in terrestrial ecosystems in China remains unknown. Here, we utilize published data including carbon (C) fluxes from eddy flux tower (gross ecosystem productivity, ecosystem respiration, and net ecosystem productivity) and the corresponding climate and N deposition data for 60 typical ecosystems in China. The objective was to investigate the effect of N deposition on ecosystem productivity and explore the variations of N use efficiency (NUE). Our results reveal that atmospheric total N deposition is significantly correlated with C fluxes of terrestrial ecosystems in China. Ecosystems respond variably to different components of N deposition. In detail, forest ecosystem marginally correlated with NO3--N and wet deposition, while grassland ecosystem significantly correlated with NH4+-N and dry deposition. NUE of productivity induced by N deposition in Chinese terrestrial ecosystems was 53.95 +/- 40.30 g C g-1 N, and it was influenced by precipitation and aridity index. This study quantifies the contribution of total N deposition and its associated components to productivity in terrestrial ecosystems in China, offering vital information for regional C and N management.
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