Net neutral carbon responses to warming and grazing in alpine grassland ecosystems

NWIPB OpenIR

	Net neutral carbon responses to warming and grazing in alpine grassland ecosystems
	Lv Wangwang; Luo Caiyun; Zhang Lirong; Niu Haishan; Zhang Zhenhua; Wang Shiping; Wang Yanfen; Jiang Lili; Wang Yonghui; He Jinsheng; Paul, Kardol; Wang Qi; Li Bowen; Liu Peipei; Tsechoe, Dorji; Zhou Huakun; Zhao Xinquan; Zhao Liang
	2020
Source Publication	AGRICULTURAL AND FOREST METEOROLOGY
Volume	280
Abstract	In natural grasslands, effects of warming on net ecosystem CO2 exchange (NEE) may interact with grazing. Yet, the effects of these two main drivers of terrestrial carbon cycling are typically studied in isolation, limiting our understanding of how NEE would be affected under different global change scenarios. Here, we report results of a warming experiment using infrared heaters combined with summer and winter grazing for 7-years in a Tibetan alpine grassland. We found that regardless of warming summer grazing decreased soil carbon sink (i.e., increased annual mean net biome productivity (NBP) indicated by a negative value of NBP), and warming also reduced soil carbon sink under no-grazing only during 3-years of summer grazing. However, warming and grazing did not change soil carbon sink during 4-years of winter grazing. Interactive effects between warming and grazing on annual NBP varied with year and grazing season. Overall, both warming and grazing did not alter annual mean NBP under 7-years of the rotational grazing system in summer and winter grasslands because of offsetting effects on annual mean gross primary productivity and ecosystem respiration. Annual mean soil temperature explained 58% of the variation of annual mean NBP during summer grazing, whereas seasonal mean soil moisture explained 48 and 44% of its variation during winter grazing and the two season grazing system, respectively. Together, our results suggest that rotational grazing between summer and winter alpine grasslands would result in net neutral climate feedback based on the response of annual NBP under future warming. The two season grazing system not only supports animal production but also realizes balance in the soil carbon budget under future warming.
Keyword	Gross primary production Ecosystem respiration Net ecosystem CO2 exchange Warming and grazing Alpine grassland Tibetan Plateau
Document Type	期刊论文
Identifier	http://210.75.249.4/handle/363003/60439
Collection	中国科学院西北高原生物研究所
Recommended Citation GB/T 7714	Lv Wangwang,Luo Caiyun,Zhang Lirong,et al. Net neutral carbon responses to warming and grazing in alpine grassland ecosystems[J]. AGRICULTURAL AND FOREST METEOROLOGY,2020,280.
APA	Lv Wangwang.,Luo Caiyun.,Zhang Lirong.,Niu Haishan.,Zhang Zhenhua.,...&Zhao Liang.(2020).Net neutral carbon responses to warming and grazing in alpine grassland ecosystems.AGRICULTURAL AND FOREST METEOROLOGY,280.
MLA	Lv Wangwang,et al."Net neutral carbon responses to warming and grazing in alpine grassland ecosystems".AGRICULTURAL AND FOREST METEOROLOGY 280(2020).

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