干旱区生态环境知识资源中心(Arid): Spatiotemporal characteristics of Net Ecosystem Exchange in the Beijing-Tianjin sand source region and its response to drought

Arid

DOI	10.1016/j.catena.2024.108076
	Spatiotemporal characteristics of Net Ecosystem Exchange in the Beijing-Tianjin sand source region and its response to drought
	Si, Wenyang; Wu, Zhitao; Du, Ziqiang; Liang, Hanxue; Lei, Tianjie; Sun, Bin
通讯作者	Wu, ZT
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	242
英文摘要	In the context of global change, the carbon budget in arid and semi-arid regions have changed significantly. Understanding these dynamic features and their response to climate change is essential for regional carbon cycle assessments. The Beijing-Tianjin Sand Source Region (BTSSR), a significant ecological project in China, is central to studies on carbon budget dynamics. While global change intensifies, understanding its carbon budget response to drought is crucial. By integrating data from the Net Ecosystem Exchange (NEE) and the Standardized Precipitation Evapotranspiration Index (SPEI), we analyzed the spatiotemporal attributes of NEE in this region and its response to drought. The BTSSR is currently in a carbon sink state, with the mean NEE being -45.13 gCm(-2) and a rate of change at -0.005 gCm(-2)a(-1). The maximum carbon sink occurs during the summer, whereas the winter is characterized by a net release of carbon to the atmosphere. In terms of spatial variation, the NEE shifts from positive to negative from southeast to northwest across the region. The impact of drought on summer NEE is notably significant, with the correlation and sensitivity being -0.717 (p < 0.05) and -3.911, respectively. As drought intensity increases, NEE changes from negative to positive, transforming BTSSR into a carbon source. NEE responded most significantly to strong drought and was less affected by light drought. The NEE of BTSSR showed a significant short-term response to drought, with a lag of 1-4 months. Considering different vegetation types, the temperate desert's NEE is most significantly affected by drought and is the most sensitive, with correlation and sensitivity values of -0.841 (p < 0.05) and -12.570, respectively. In contrast, the warm temperate deciduous broadleaf forest shows stronger resistance to drought. This study elucidates how the carbon budget of different vegetation types in a typical ecological engineering area changes under the background of climate change and human activities, and contributes to the understanding of the impacts of drought events on the carbon cycle of different vegetation types, as well as the response of the latter to the former, especially the lagged response. It provides different perspectives for the subsequent ecological engineering construction.
英文关键词	Net Ecosystem Exchange Drought Lagged Response Cumulative Effect Beijing-Tianjin Sand Source Region
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001240611700001
WOS关键词	CLIMATE EXTREMES ; CARBON FLUXES ; DATASET ; IMPACT
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403157
推荐引用方式 GB/T 7714	Si, Wenyang,Wu, Zhitao,Du, Ziqiang,et al. Spatiotemporal characteristics of Net Ecosystem Exchange in the Beijing-Tianjin sand source region and its response to drought[J],2024,242.
APA	Si, Wenyang,Wu, Zhitao,Du, Ziqiang,Liang, Hanxue,Lei, Tianjie,&Sun, Bin.(2024).Spatiotemporal characteristics of Net Ecosystem Exchange in the Beijing-Tianjin sand source region and its response to drought.CATENA,242.
MLA	Si, Wenyang,et al."Spatiotemporal characteristics of Net Ecosystem Exchange in the Beijing-Tianjin sand source region and its response to drought".CATENA 242(2024).