Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, China.
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China.
Environ Res. 2021 Nov;202:111787. doi: 10.1016/j.envres.2021.111787. Epub 2021 Jul 30.
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., NO-N and NH-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 NO-N and wet deposition, while grassland ecosystem significantly correlated with NH-N and dry deposition. NUE of productivity induced by N deposition in Chinese terrestrial ecosystems was 53.95 ± 40.30 g C g 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.
长期大气氮（N）沉积增加了陆地生态系统中生物可利用的 N，从而影响了生态系统生产力。然而，N 沉积及其组成部分（即 NO-N 和 NH-N）如何影响中国陆地生态系统生产力的空间格局尚不清楚。在这里，我们利用已发表的数据，包括来自涡度通量塔的碳（C）通量（总生态系统生产力、生态系统呼吸和净生态系统生产力）以及相应的气候和 N 沉积数据，对中国 60 个典型生态系统进行了研究。目的是调查 N 沉积对生态系统生产力的影响，并探讨 N 利用效率（NUE）的变化。我们的结果表明，大气总 N 沉积与中国陆地生态系统的 C 通量显著相关。生态系统对 N 沉积的不同组成部分有不同的反应。具体而言，森林生态系统与 NO-N 和湿沉降略有相关，而草原生态系统与 NH-N 和干沉降显著相关。中国陆地生态系统中由 N 沉积引起的生产力 NUE 为 53.95±40.30 g C g N，受降水和干旱指数的影响。本研究量化了总 N 沉积及其相关组成部分对中国陆地生态系统生产力的贡献，为区域 C 和 N 管理提供了重要信息。
