干旱区生态环境知识资源中心(Arid): Drought-induced shift from a carbon sink to a carbon source in the grasslands of Inner Mongolia, China

Arid

DOI	10.1016/j.catena.2020.104845
	Drought-induced shift from a carbon sink to a carbon source in the grasslands of Inner Mongolia, China
	Zhang, Rui; Zhao, Xueyong; Zuo, Xiaoan; Degen, A. Allan; Li, Yulin; Liu, Xinping; Luo, Yayong; Qu, Hao; Lian, Jie; Wang, Ruixiong
通讯作者	Zhang, R ; Zhao, XY
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2020
卷号	195
英文摘要	Precipitation has an impact on both gross ecosystem productivity (GEP) and ecosystem respiration (Reco), which ultimately influences net ecosystem productivity (NEP). A positive NEP denotes an ecosystem functioning as a carbon sink; whereas, a negative NEP denotes an ecosystem functioning as a carbon source. Therefore, drought plays an important role in the carbon balance of an ecosystem. However, little is known about the point at which the ecosystem converts from a carbon sink to a carbon source in extreme droughts. Such knowledge is crucial for predicting terrestrial carbon cycling under climate change, and consequently, was the subject of this study. We imposed two types of drought treatments on desert-grassland: (1) press-drought, in which the quantity of natural precipitation was reduced by 66% from May to August; and (2) pulse-drought, in which the quantity of natural precipitation was reduced by 100% during June and July. Reco and NEP were measured and GEP was calculated and then regression analyses were employed to determine the point at which the carbon sink shifts to a carbon source. The regression equation of NEP (mu mol.m(-2).s(-1)) on Reco (mu mol.m(-2).s(-1)) took the form: NEP = 0.504 Reco - 0.086 and, consequently, when Reco equaled 0.171 mu mol.m(-2).s(-1), there was zero change in the carbon sink and GEP also equaled 0.171 mu mol.m(-2).s(-1). Below this value, the ecosystem functioned as a carbon source, whereas above this value, the ecosystem functioned as a carbon sink. Structural equation models (SEM) demonstrated that coverage, standing biomass, pH, soil water content and total soil carbon were the main driving factors on desert grassland ecosystem carbon fluxes.
英文关键词	Desert-grassland Driving factors Extreme drought Ecosystem respiration Gross ecosystem productivity Net ecosystem productivity Structural equation model
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000580366300065
WOS关键词	TERRESTRIAL ECOSYSTEMS ; PRODUCTIVITY RESPONSES ; INORGANIC CARBON ; ALPINE MEADOW ; SOIL-WATER ; PRECIPITATION ; FLUXES ; VARIABILITY ; EXCHANGE ; RESPIRATION
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	Ben-Gurion University of the Negev
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326965
作者单位	[Zhang, Rui; Zhao, Xueyong; Li, Yulin; Liu, Xinping; Luo, Yayong; Lian, Jie; Wang, Ruixiong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Naiman Desertificat Res Stn, Lanzhou, Peoples R China; [Zhang, Rui; Zhao, Xueyong; Zuo, Xiaoan; Qu, Hao; Wang, Ruixiong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Urat Desert Grassland Res Stn, Lanzhou, Peoples R China; [Degen, A. Allan] Ben Gurion Univ Negev, Blaustein Inst Desert Res, Wyler Dept Dryland Agr, Desert Anim Adaptat & Husb, IL-8410500 Beer Sheva, Israel
推荐引用方式 GB/T 7714	Zhang, Rui,Zhao, Xueyong,Zuo, Xiaoan,et al. Drought-induced shift from a carbon sink to a carbon source in the grasslands of Inner Mongolia, China[J]. Ben-Gurion University of the Negev,2020,195.
APA	Zhang, Rui.,Zhao, Xueyong.,Zuo, Xiaoan.,Degen, A. Allan.,Li, Yulin.,...&Wang, Ruixiong.(2020).Drought-induced shift from a carbon sink to a carbon source in the grasslands of Inner Mongolia, China.CATENA,195.
MLA	Zhang, Rui,et al."Drought-induced shift from a carbon sink to a carbon source in the grasslands of Inner Mongolia, China".CATENA 195(2020).