Long-Term Warming and Nitrogen Addition Have Contrasting Effects on Ecosystem Carbon Exchange in a Desert Steppe

文献类型： 外文期刊

第一作者： Wu, Qian

作者： Wu, Qian;Ren, Haiyan;Bisseling, Ton;Pan, Zhanlei;Zhao, Mengli;Wang, Zhongwu;Li, Zhiguo;Han, Guodong;Bisseling, Ton;Cheng, Xu;Chang, Scott X.;Chang, Scott X.;Wang, Zhen;Li, Yuanheng;Liu, Yinghao;Cahill, James F., Jr.

作者机构：

关键词： C-3 and C-4 plants; ecosystem CO2 flux; ecosystem resilience; global warming; nitrogen deposition; plant photosynthetic type

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：9.028； 五年影响因子：9.922 ）

ISSN： 0013-936X

年卷期： 2021 年 55 卷 11 期

页码：

收录情况： SCI

摘要： Desert steppe, a unique ecotone between steppe and desert in Eurasia, is considered highly vulnerable to global change. However, the long-term impact of warming and nitrogen deposition on plant biomass production and ecosystem carbon exchange in a desert steppe remains unknown. A 12-year field experiment was conducted in a Stipa brevif lora desert steppe in northern China. A split-design was used, with warming simulated by infrared radiators as the primary factor and N addition as the secondary factor. Our long-term experiment shows that warming did not change net ecosystem exchange (NEE) or total aboveground biomass (TAB) due to contrasting effects on C-4 (23.4% increase) and C-3 (11.4% decrease) plant biomass. However, nitrogen addition increased TAB by 9.3% and NEE by 26.0% by increasing soil available N content. Thus, the studied desert steppe did not switch from a carbon sink to a carbon source in response to global change and positively responded to nitrogen deposition. Our study indicates that the desert steppe may be resilient to long-term warming by regulating plant species with contrasting photosynthetic types and that nitrogen deposition could increase plant growth and carbon sequestration, providing negative feedback on climate change.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序