Desertification process and its effects on vegetation carbon sources and sinks vary under different aridity stress in Central Asia during 1990-2020
文献类型：期刊论文
| 作者 | Li, Saibo; He, Shaoyang; Xu, Zhe; Liu, Yi; von Bloh, Werner |
| 刊名 | CATENA
 |
| 出版日期 | 2023-02-01 |
| 卷号 | 221 |
| 关键词 | Desertification Net ecosystem productivity (NEP) Spatiotemporal variation Aridity stress Central Asia |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2022.106767 |
| 文献子类 | Article |
| 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. |
| WOS关键词 | NET PRIMARY PRODUCTIVITY ; LAND-COVER CHANGES ; ECOSYSTEM PRODUCTION ; DEGRADATION ; PLATEAU ; CLIMATE ; CHINA ; DYNAMICS ; IMPACTS ; INDEX |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| WOS记录号 | WOS:000913122000002 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/189631]  |
| 专题 | 陆地水循环及地表过程院重点实验室_外文论文 |
| 作者单位 | 1.University of Chinese Academy of Sciences, CAS 2.Potsdam Institut fur Klimafolgenforschung 3.Chinese Academy of Sciences 4.Institute of Geographic Sciences & Natural Resources Research, CAS |
| 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]. CATENA,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). |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。