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

文献类型：期刊论文

作者Li, Ping2; Sayer, Emma J.; Jia, Zhou2; Liu, Weixing; Wu, Yuntao2; Yang, Sen2; Wang, Chengzhang2; Yang, Lu2; Chen, Dima4; Bai, Yongfei2
刊名GLOBAL CHANGE BIOLOGY
出版日期2020
卷号26期号:5页码:3015-3027
关键词community composition net ecosystem exchange plant biomass semiarid grassland stability winter snow cover
ISSN号1354-1013
DOI10.1111/gcb.15051
文献子类Article
英文摘要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.
学科主题Biodiversity Conservation ; Ecology ; Environmental Sciences
出版地HOBOKEN
电子版国际标准刊号1365-2486
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
语种英语
WOS记录号WOS:000526102300023
出版者WILEY
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
源URL[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.Univ Chinese Acad Sci, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
3.China Three Gorges Univ, Coll Biol & Pharmaceut Sci, Yichang, Peoples R China
4.Sayer, Emma J.] Univ Lancaster, Lancaster Environm Ctr, Lancaster, England
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.

入库方式： OAI收割

来源：植物研究所

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