气候变化领域集成服务门户(CCPortal): Annual ecosystem respiration is resistant to changes in freeze-thaw periods in semi-arid permafrost

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DOI	10.1111/gcb.14979
	Annual ecosystem respiration is resistant to changes in freeze-thaw periods in semi-arid permafrost
	Wang, Qi; Lv, Wangwang; Li, Bowen; Zhou, Yang; Jiang, Lili; Piao, Shilong; Wang, Yanfen; Zhang, Lirong; Meng, Fandong; Liu, Peipei; Hong, Huan; Li, Yaoming; Dorji, Tsechoe; Luo, Caiyun; Zhang, Zhenhua; Ciais, Philippe; Penuelas, Josep; Kardol, Paul; Zhou, Huakun; Wang, Shiping
通讯作者	Wang, SP (通讯作者)
发表日期	2020
ISSN	1354-1013
EISSN	1365-2486
起始页码	2630
结束页码	2641
卷号	26 期号:4
英文摘要	Warming in cold regions alters freezing and thawing (F-T) of soil in winter, exposing soil organic carbon to decomposition. Carbon-rich permafrost is expected to release more CO2 to the atmosphere through ecosystem respiration (Re) under future climate scenarios. However, the mechanisms of the responses of freeze-thaw periods to climate change and their coupling with Re in situ are poorly understood. Here, using 2 years of continuous data, we test how changes in F-T events relate to annual Re under four warming levels and precipitation addition in a semi-arid grassland with discontinuous alpine permafrost. Warming shortened the entire F-T period because the frozen period shortened more than the extended freezing period. It decreased total Re during the F-T period mainly due to decrease in mean Re rate. However, warming did not alter annual Re because of reduced soil water content and the small contribution of total Re during the F-T period to annual Re. Although there were no effects of precipitation addition alone or interactions with warming on F-T events, precipitation addition increased total Re during the F-T period and the whole year. This decoupling between changes in soil freeze-thaw events and annual Re could result from their different driving factors. Our results suggest that annual Re could be mainly determined by soil water content rather than by change in freeze-thaw periods induced by warming in semi-arid alpine permafrost.
关键词	CLIMATE-CHANGE TERRESTRIAL ECOSYSTEMS TIBETAN PLATEAU ALPINE MEADOW CARBON FLUXES CO2 EMISSIONS SOIL CARBON NITROGEN DYNAMICS CYCLES
英文关键词	ecosystem respiration; freeze-thaw events; number and frequency of freeze-thaw cycles; precipitation addition; semi-arid with ice-poor permafrost; Tibetan Plateau; warming gradient
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:000513647700001
来源期刊	GLOBAL CHANGE BIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260104
推荐引用方式 GB/T 7714	Wang, Qi,Lv, Wangwang,Li, Bowen,et al. Annual ecosystem respiration is resistant to changes in freeze-thaw periods in semi-arid permafrost[J]. 中国科学院青藏高原研究所,2020,26(4).
APA	Wang, Qi.,Lv, Wangwang.,Li, Bowen.,Zhou, Yang.,Jiang, Lili.,...&Wang, Shiping.(2020).Annual ecosystem respiration is resistant to changes in freeze-thaw periods in semi-arid permafrost.GLOBAL CHANGE BIOLOGY,26(4).
MLA	Wang, Qi,et al."Annual ecosystem respiration is resistant to changes in freeze-thaw periods in semi-arid permafrost".GLOBAL CHANGE BIOLOGY 26.4(2020).