干旱区生态环境知识资源中心(Arid): Spatial variation of carbon turnover time and carbon uptake in a Chinese desert steppe ecosystem

Arid

DOI	10.1016/j.ecolind.2020.106120
	Spatial variation of carbon turnover time and carbon uptake in a Chinese desert steppe ecosystem
	Yang, Bo; Gong, Jirui; Zhang, Zihe; Li, Xiaobing; Wang, Biao; Zhu, Chenchen; Shi, Jiayu; Zhang, Weiyuan; Yue, Kexin
通讯作者	Gong, Jirui
来源期刊	ECOLOGICAL INDICATORS
ISSN	1470-160X
EISSN	1872-7034
出版年	2020
卷号	112
英文摘要	Quantifying the carbon dynamics in arid and semi-arid ecosystems is a key issue in determining the global carbon budget. Carbon turnover time (CTT) and carbon uptake are the key indicators that determine the C dynamics and the potential C sequestration, but it has not been well quantified in a specific ecosystem. Our study combined a field inventory in a desert steppe ecosystem with data synthesis and the Terrestrial Ecosystem Regional model (TECO-R) for desert steppes to invert the key parameters of the ecosystem's carbon cycle. The average CTT in the leaf, root, and soil carbon pools (to a depth of 50 cm) and for the whole ecosystem was 1.43, 10.1, 76.96, and 37.65 years, respectively. The study area's net primary productivity (NPP) averaged 131.93 g C M-2 yr(-1) from 2000 to 2018 based on the Carnegie-Ames-Stanford approach, and the ecosystem C uptake averaged 28.86 g C M-2 yr(-1), driven by an increasing NPP trend. The whole-ecosystem CTT (CTTE) increased significantly, by about 6 years per 25-mm increase in precipitation, 0.45 degrees increase in latitude, 1000-g increase in SOC, and 50-g C m(-2) yr(-1) increase in NPP. The threshold temperature for CTT in the desert steppe was around 6 degrees C. CTTE was significantly negatively correlated with temperature above this temperature, but below this value is the opposite. However, the pattern of ecosystem potential C uptake was affected by climate, NPP, and the intensity of human activities, with no clearly dominant factor. These analyses of the desert steppe's carbon cycle will help to improve the assessment of dryland carbon dynamics and global carbon budgets.
英文关键词	Dryland Carbon turnover time Carbon uptake Desert steppe Spatial variation
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000518385800081
WOS关键词	SOIL ORGANIC-MATTER ; NET PRIMARY PRODUCTIVITY ; EARTH SYSTEM MODELS ; RESIDENCE TIME ; TEMPERATURE SENSITIVITY ; SEMIARID ECOSYSTEMS ; CLIMATE-CHANGE ; HETEROTROPHIC RESPIRATION ; RADIOCARBON CONSTRAINTS ; TERRESTRIAL ECOSYSTEMS
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314360
作者单位	Beijing Normal Univ, Fac Geog Sci, Sch Nat Resources, Key Lab Surface Proc & Resource Ecol, 19 Xinjiekouwai St, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Yang, Bo,Gong, Jirui,Zhang, Zihe,et al. Spatial variation of carbon turnover time and carbon uptake in a Chinese desert steppe ecosystem[J]. 北京师范大学,2020,112.
APA	Yang, Bo.,Gong, Jirui.,Zhang, Zihe.,Li, Xiaobing.,Wang, Biao.,...&Yue, Kexin.(2020).Spatial variation of carbon turnover time and carbon uptake in a Chinese desert steppe ecosystem.ECOLOGICAL INDICATORS,112.
MLA	Yang, Bo,et al."Spatial variation of carbon turnover time and carbon uptake in a Chinese desert steppe ecosystem".ECOLOGICAL INDICATORS 112(2020).