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| DOI | 10.1016/j.scitotenv.2024.171486 |
| Disentangling influences of driving forces on intra-annual variability in sediment discharge in karst watersheds | |
| 发表日期 | 2024 |
| ISSN | 0048-9697 |
| EISSN | 1879-1026 |
| 起始页码 | 923 |
| 卷号 | 923 |
| 英文摘要 | The intra-annual variability in sediment discharge was considerably influenced by the climate variability and vegetation dynamics. Because of the coupled or relationships between climatic and vegetation variables, it is still challenging to decouple the direct and indirect effects of climate variability and vegetation dynamics on hydrological and sediment transport processes. The purpose of this study is to decouple influences of individual driving force on intra-annual distribution of sediment discharge during 2003-2017 using the partial least squares structural equation model (PLS-SEM) method in four typical karst watersheds of Southwest China. The coefficient of variation (Cv), Completely regulation coefficient (Cr), Lorenz asymmetry coefficient and Gini coefficient were used to represent the intra-annual sediment discharge variability. Results showed that the monthly sediment discharge (190 % < Cv < 353 %) exhibited greater variability than its potential affecting factors (18 % < Cv < 101 %). From the PLS-SEM analysis, the water discharge, climate, and vegetation together explain 57 %- 75 %, 64 %-79 %, and 53 %-80 % of the total variance in Cv, Cr, and Gini coefficient, respectively. Specifically, water discharge exerts the largest influence on sediment discharge variability (0.65 <= direct effect <= 0.97, P < 0.05), while vegetation dynamic mainly indirectly affects sediment discharge variability (-0.88 <= indirect effect <= -0.01) through influencing water discharge. The climate factors also principally indirectly affect the sediment discharge variability (-0.47 <= indirect effect <= 0.19) by affecting water discharge and vegetation. The PLS-SEM can effectively reveal the driving force and influencing mechanism of intra-annual sediment discharge changes, and provide an important reference for regional soil and water resources management in karst watersheds. Future studies can decouple the influences of the extreme climate, unique lithology, discontinuous soil, heterogeneous landscape, and special geomorphology on spatial variability in sediment discharge across different karst watersheds. |
| 英文关键词 | Soil erosion; Completely regulation coefficient; Gini coefficient; Lorenz asymmetry coefficient; Karst ecosystems |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Environmental Sciences |
| WOS记录号 | WOS:001218823500001 |
| 来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/302179 |
| 作者单位 | Hunan Agricultural University; Chinese Academy of Sciences; Institute of Subtropical Agriculture, CAS |
| 推荐引用方式 GB/T 7714 | . Disentangling influences of driving forces on intra-annual variability in sediment discharge in karst watersheds[J],2024,923. |
| APA | (2024).Disentangling influences of driving forces on intra-annual variability in sediment discharge in karst watersheds.SCIENCE OF THE TOTAL ENVIRONMENT,923. |
| MLA | "Disentangling influences of driving forces on intra-annual variability in sediment discharge in karst watersheds".SCIENCE OF THE TOTAL ENVIRONMENT 923(2024). |
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