数字农科院2.0

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

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

作者机构：

关键词： C3 and C4 plants;ecosystem CO2 flux;ecosystem resilience;global warming;nitrogen deposition;plant photosynthetic type

期刊名称： Environmental science & technology

ISSN： 1520-5851

年卷期： 2021 年 55.0 卷 11.0 期

页码：

收录情况： JCR（2021版） ; EI（2021版）

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 breviflora 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 C4 (23.4% increase) and C3 (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.

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