Dynamics of soil loss and sediment export as affected by land use/cover change in Koshi River Basin, Nepal | |
Yigez, Belayneh6,7; Xiong, Donghong5,7; Zhang, Baojun7; Belete, Marye4; Chalise, Devraj3; Chidi, Chhabi Lal2; Guadie, Awoke1; Wu, Yanhong5,7; Rai, Dil Kumar6,7 | |
刊名 | JOURNAL OF GEOGRAPHICAL SCIENCES |
2023-06-01 | |
卷号 | 33期号:6页码:1287-1312 |
关键词 | soil loss sediment export land use cover InVEST model Koshi River basin Google Earth Engine |
ISSN号 | 1009-637X |
DOI | 10.1007/s11442-023-2130-x |
英文摘要 | How the dynamics in soil loss (SL) and sedimentation are affected by land use/cover change (LULCC) has long been one of the most important issues in watershed management worldwide, especially in fragile mountainous river basins. This study aimed to investigate the impact of LULCC on SL and sediment export (SE) in eastern regions of the Koshi River basin (KRB), Nepal, from 1990 to 2021. The Random Forest classifier in the Google Earth Engine platform was employed for land use/land cover (LULC) classification, and the Integrated Valuation Ecosystem Services and Trade-offs (InVEST) Sediment Delivery Ratio model was used for SL and SE modeling. The results showed that there was a pronounced increase in forest land (4.12%), grassland (2.35%), and shrubland (3.68%) at the expense of agricultural land (10.32%) in KRB over the last three decades. Thus, the mean SL and SE rates decreased by 48% and 60%, respectively, from 1990 to 2021. The conversion of farmland to vegetated lands has greatly contributed to the decrease in SL and SE rates. Furthermore, the rates of SL and SE showed considerable spatiotemporal variations under different LULC types, topographic factors (slope aspect and gradient), and sub-watersheds. The higher rates of SL and SE in the study area were observed mostly in slope gradient classes between 8 & DEG; and 35 & DEG; (accounting for 83%-91%) and sunny and semi-sunny slope aspects (SE, S, E, and SW) (accounting for 57%-65%). Although the general mean rate of SL presented a decreasing trend in the study area, the current mean SL rate (23.33 t ha(-1) yr(-1)) in 2021 is still far beyond the tolerable SL rate of both the global (10 Mg ha(-1) yr(-1)) and the Himalayan region (15 t ha(-1) yr(-1)). Therefore, landscape restoration measures should be integrated with other watershed management strategies and upscaled to hotspot areas to regulate basin sediment flux and secure ecosystem service sustainability. |
资助项目 | Chinese Academy of Sciences (CAS) Overseas Institution Platform Project[131C11KYSB20200033] |
WOS关键词 | LOESS PLATEAU ; MIDDLE MOUNTAINS ; CLIMATE-CHANGE ; COVER CHANGES ; EROSION ; ABANDONMENT ; CATCHMENT ; LANDSCAPE ; CHINA ; GIS |
WOS研究方向 | Physical Geography |
语种 | 英语 |
出版者 | SCIENCE PRESS |
WOS记录号 | WOS:001013197500008 |
资助机构 | Chinese Academy of Sciences (CAS) Overseas Institution Platform Project |
内容类型 | 期刊论文 |
源URL | [http://ir.imde.ac.cn/handle/131551/57555] |
专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
通讯作者 | Xiong, Donghong |
作者单位 | 1.Arba Minch Univ, Coll Nat Sci, Dept Biol, Arba Minch 21, Ethiopia 2.Tribhuvan Univ, Cent Dept Geog, Kathmandu, Nepal 3.Mackay Area Prod Serv, 26135 Peak Downs Highway, Te Kowai, Qld 4740, Australia 4.Debre Tabor Univ, Dept Nat Resource Management, Debre Tabor 272, Ethiopia 5.CAS TU, Kathmandu Ctr Res & Educ, Branch Sustainable Mt Dev, Kathmandu 44613, Nepal 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 7.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China |
推荐引用方式 GB/T 7714 | Yigez, Belayneh,Xiong, Donghong,Zhang, Baojun,et al. Dynamics of soil loss and sediment export as affected by land use/cover change in Koshi River Basin, Nepal[J]. JOURNAL OF GEOGRAPHICAL SCIENCES,2023,33(6):1287-1312. |
APA | Yigez, Belayneh.,Xiong, Donghong.,Zhang, Baojun.,Belete, Marye.,Chalise, Devraj.,...&Rai, Dil Kumar.(2023).Dynamics of soil loss and sediment export as affected by land use/cover change in Koshi River Basin, Nepal.JOURNAL OF GEOGRAPHICAL SCIENCES,33(6),1287-1312. |
MLA | Yigez, Belayneh,et al."Dynamics of soil loss and sediment export as affected by land use/cover change in Koshi River Basin, Nepal".JOURNAL OF GEOGRAPHICAL SCIENCES 33.6(2023):1287-1312. |
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