Deepened winter snow cover enhances net ecosystem exchange and stabilizes plant community composition and productivity in a temperate grassland

doi:10.1111/gcb.15051

	Deepened winter snow cover enhances net ecosystem exchange and stabilizes plant community composition and productivity in a temperate grassland
	Li, Ping 1; Sayer, Emma J.; Jia, Zhou 1; Liu, Weixing ; Wu, Yuntao 1; Yang, Sen 1; Wang, Chengzhang 1; Yang, Lu 1; Chen, Dima 3; Bai, Yongfei1 ; Liu, Lingli1
	2020
发表期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
卷号	26 期号:5 页码:3015-3027
摘要	Global warming has greatly altered winter snowfall patterns, and there is a trend towards increasing winter snow in semi-arid regions in China. Winter snowfall is an important source of water during early spring in these water-limited ecosystems, and it can also affect nutrient supply. However, we know little about how changes in winter snowfall will affect ecosystem productivity and plant community structure during the growing season. Here, we conducted a 5-year winter snow manipulation experiment in a temperate grassland in Inner Mongolia. We measured ecosystem carbon flux from 2014 to 2018 and plant biomass and species composition from 2015 to 2018. We found that soil moisture increased under deepened winter snow in early growing season, particularly in deeper soil layers. Deepened snow increased the net ecosystem exchange of CO2 (NEE) and reduced intra- and inter-annual variation in NEE. Deepened snow did not affect aboveground plant biomass (AGB) but significantly increased root biomass. This suggested that the enhanced NEE was allocated to the belowground, which improved water acquisition and thus contributed to greater stability in NEE in deep-snow plots. Interestingly, the AGB of grasses in the control plots declined over time, resulting in a shift towards a forb-dominated system. Similar declines in grass AGB were also observed at three other locations in the region over the same time frame and are attributed to 4 years of below-average precipitation during the growing season. By contrast, grass AGB was stabilized under deepened winter snow and plant community composition remained unchanged. Hence, our study demonstrates that increased winter snowfall may stabilize arid grassland systems by reducing resource competition, promoting coexistence between plant functional groups, which ultimately mitigates the impacts of chronic drought during the growing season.
关键词	community composition net ecosystem exchange plant biomass semiarid grassland stability winter snow cover
学科领域	Biodiversity Conservation ; Ecology ; Environmental Sciences
DOI	10.1111/gcb.15051
收录类别	SCI
语种	英语
WOS关键词	NITROGEN MINERALIZATION ; FUNCTIONAL DIFFERENCES ; SPECIES COEXISTENCE ; INNER-MONGOLIA ; HYDRAULIC LIFT ; WATER-UPTAKE ; CARBON ; DYNAMICS ; PATTERNS ; PRECIPITATION
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS记录号	WOS:000526102300023
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1365-2486
资助机构	Chinese Academy of SciencesChinese Academy of Sciences [XDA23080301] Funding Source: Medline ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31670478, 31988102] Funding Source: Medline ; Chinese National Key Development Program for Basic Research [2017YFC0503900, 2019YFA0607302] Funding Source: Medline
作者邮箱	lingli.liu@ibcas.ac.cn
作品OA属性	Green Accepted
引用统计	被引频次：35[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/21807
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Sayer, Emma J.] Univ Lancaster, Lancaster Environm Ctr, Lancaster, England 4.China Three Gorges Univ, Coll Biol & Pharmaceut Sci, Yichang, Peoples R China
推荐引用方式 GB/T 7714	Li, Ping,Sayer, Emma J.,Jia, Zhou,et al. Deepened winter snow cover enhances net ecosystem exchange and stabilizes plant community composition and productivity in a temperate grassland[J]. GLOBAL CHANGE BIOLOGY,2020,26(5):3015-3027.
APA	Li, Ping.,Sayer, Emma J..,Jia, Zhou.,Liu, Weixing.,Wu, Yuntao.,...&Liu, Lingli.(2020).Deepened winter snow cover enhances net ecosystem exchange and stabilizes plant community composition and productivity in a temperate grassland.GLOBAL CHANGE BIOLOGY,26(5),3015-3027.
MLA	Li, Ping,et al."Deepened winter snow cover enhances net ecosystem exchange and stabilizes plant community composition and productivity in a temperate grassland".GLOBAL CHANGE BIOLOGY 26.5(2020):3015-3027.

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