干旱区生态环境知识资源中心(Arid): Desertification process and its effects on vegetation carbon sources and sinks vary under different aridity stress in Central Asia during 1990-2020

Arid

DOI	10.1016/j.catena.2022.106767
	Desertification process and its effects on vegetation carbon sources and sinks vary under different aridity stress in Central Asia during 1990-2020
	Li, Saibo; He, Shaoyang; Xu, Zhe; Liu, Yi; von Bloh, Werner
通讯作者	He, SY
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2023
卷号	221
英文摘要	Desertification has hampered eco-environment sustainable development in arid, semi-arid, and dry sub-humid areas. However, the effect of the desertification process on vegetation carbon sources and sinks remains un-clear in Central Asia. Based on Landsat images and cloud computing, this study applied and evaluated five machine learning methods (i.e., classification and regression tree, random forest, support vector machine, gradient tree boost (GTB), and naive bayes) and desertification difference index method to improve desertifi-cation estimation by integrating vegetation, soil, terrain, and climate conditions. According to the optimal method and net ecosystem production (NEP) model, we quantitatively explored vegetation carbon sources and sinks in Central Asia from 1990 to 2020, and then the effect of the desertification process on them was quantified under different aridity stress. The results showed that GTB method performs best on the test set and spatial pattern, which has higher overall accuracy (82.1 %) and Kappa coefficient (0.78) than other five methods. The desertification area has decreased by 8.58 % (341,643 km(2)) from 1990 to 2020. Among them, the severe and slight desertification areas decreased by 62.42 % and 32.11 %, respectively, while the moderate and high desertification areas increased by 24.6 % and 13.11 %, respectively. In particular, land restoration areas where the desertification restored one or above levels, accounted for 33.91 % of the total area. NEP in Central Asia showed an increasing trend at a rate of 0.54 g C m(-2) yr(-1) during 1990-2020, and the area passed the t-test (p < 0.05) was mainly located in Kazakh Steppe, Kazakh Uplands, and the edge of Tianshan Mountains. In general, restoring the land of degraded ecosystems has stored up 61.08 x 10(3) t carbon, accounting for 59.61 % of the total net change of NEP, but the fragile ecological environments in the existing desertification areas have been further aggravated.
英文关键词	Desertification Net ecosystem productivity (NEP) Spatiotemporal variation Aridity stress Central Asia
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000913122000002
WOS关键词	NET PRIMARY PRODUCTIVITY ; LAND-COVER CHANGES ; ECOSYSTEM PRODUCTION ; DEGRADATION ; PLATEAU ; CLIMATE ; CHINA ; DYNAMICS ; IMPACTS ; INDEX
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/2XILL650/395660
推荐引用方式 GB/T 7714	Li, Saibo,He, Shaoyang,Xu, Zhe,et al. Desertification process and its effects on vegetation carbon sources and sinks vary under different aridity stress in Central Asia during 1990-2020[J],2023,221.
APA	Li, Saibo,He, Shaoyang,Xu, Zhe,Liu, Yi,&von Bloh, Werner.(2023).Desertification process and its effects on vegetation carbon sources and sinks vary under different aridity stress in Central Asia during 1990-2020.CATENA,221.
MLA	Li, Saibo,et al."Desertification process and its effects on vegetation carbon sources and sinks vary under different aridity stress in Central Asia during 1990-2020".CATENA 221(2023).