globalchange  > 过去全球变化的重建
DOI: 10.1111/1365-2435.13300
WOS记录号: WOS:000471332200013
论文题名:
Differential responses of ecosystem carbon flux components to experimental precipitation gradient in an alpine meadow
作者: Zhang, Fangyue1,2; Quan, Quan1,2; Ma, Fangfang1,2; Tian, Dashuan1; Zhou, Qingping3; Niu, Shuli1,2
通讯作者: Niu, Shuli
刊名: FUNCTIONAL ECOLOGY
ISSN: 0269-8463
EISSN: 1365-2435
出版年: 2019
卷: 33, 期:5, 页码:889-900
语种: 英语
英文关键词: alpine meadow ; carbon fluxes ; climate extremes ; manipulative experiment ; nonlinear response ; precipitation gradient
WOS关键词: NET PRIMARY PRODUCTIVITY ; PLANT-SPECIES DIVERSITY ; SOIL-MOISTURE ; CLIMATE-CHANGE ; HETEROTROPHIC RESPIRATION ; INTERANNUAL VARIABILITY ; EXPERIMENTAL DROUGHT ; WATER AVAILABILITY ; DIOXIDE EXCHANGE ; EXTREME DROUGHT
WOS学科分类: Ecology
WOS研究方向: Environmental Sciences & Ecology
英文摘要:

Changes in precipitation have the potential to cause dramatic changes in ecosystem carbon (C) cycling; however, it remains unclear whether different components of the net ecosystem exchange (NEE) (e.g., C uptake vs. release, plant vs. microbe respiration, above-ground vs. below-ground plant respiration) have similar or differential sensitivity to precipitation gradients. We conducted a manipulative field experiment (from 2015 to 2017) with six precipitation treatments, including 1/12 annual precipitation (P), 1/4 P, 1/2 P, 3/4 P, P and 5/4 P in an alpine meadow to investigate the responses of the NEE components. Over the 3years, all C fluxes showed a nonlinear response to the precipitation gradients, except for root respiration. The most extreme drought treatment (1/12 P) caused strong reductions in NEE by 15.57%, gross primary productivity by 17.26% and ecosystem respiration by 19.05%, in contrast to the control. Plant respiration was more sensitive to precipitation change than microbe respiration, and above-ground plant respiration was more susceptible than below-ground respiration. Structural equation models revealed that the response of C fluxes under precipitation changes was primarily due to changes in the soil water content and above-ground net primary productivity. Our findings indicate that future precipitation changes, particularly extreme drought, will decrease ecosystem C fluxes with different magnitudes, leading to a consequent reduction of NEE. These emergent ecosystem properties are essential for the improved elucidation of carbon cycle dynamics and benchmarking models, to predict ecosystem responses to precipitation changes.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/137463
Appears in Collections:过去全球变化的重建

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作者单位: 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu, Sichuan, Peoples R China

Recommended Citation:
Zhang, Fangyue,Quan, Quan,Ma, Fangfang,et al. Differential responses of ecosystem carbon flux components to experimental precipitation gradient in an alpine meadow[J]. FUNCTIONAL ECOLOGY,2019-01-01,33(5):889-900
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