Spatio-temporal patterns of the effects of precipitation variability and land use/cover changes on long-term changes in sediment yield in the Loess Plateau, China
文献类型：期刊论文
| 作者 | Gao, GY; Zhang, JJ; Liu, Y; Ning, Z; Fu, BJ; Sivapalan, M |
| 刊名 | HYDROLOGY AND EARTH SYSTEM SCIENCES
 |
| 出版日期 | 2017 |
| 卷号 | 21期号:9页码:4363-4378 |
| ISSN号 | 1027-5606 |
| 英文摘要 | Within China's Loess Plateau there have been concerted revegetation efforts and engineering measures since the 1950s aimed at reducing soil erosion and land degradation. As a result, annual streamflow, sediment yield, and sediment concentration have all decreased considerably. Human-induced land use/cover change (LUCC) was the dominant factor, contributing over 70% of the sediment load reduction, whereas the contribution of precipitation was less than 30 %. In this study, we use 50-year time series data (1961-2011), showing decreasing trends in the annual sediment loads of 15 catchments, to generate spatio-temporal patterns in the effects of LUCC and precipitation variability on sediment yield. The space-time variability of sediment yield was expressed notionally as a product of two factors representing (i) the effect of precipitation and (ii) the fraction of treated land surface area. Under minimal LUCC, the square root of annual sediment yield varied linearly with precipitation, with the precipitation-sediment load relationship showing coherent spatial patterns amongst the catchments. As the LUCC increased and took effect, the changes in sediment yield pattern depended more on engineering measures and vegetation restoration campaign, and the within-year rainfall patterns (especially storm events) also played an important role. The effect of LUCC is expressed in terms of a sediment coefficient, i.e., the ratio of annual sediment yield to annual precipitation. Sediment coefficients showed a steady decrease over the study period, following a linear decreasing function of the fraction of treated land surface area. In this way, the study has brought out the separate roles of precipitation variability and LUCC in controlling spatio-temporal patterns of sediment yield at catchment scale. |
| 学科主题 | Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000409473300001 |
| 出版者 | COPERNICUS GESELLSCHAFT MBH |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/44006]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_生态网络实验室 |
| 推荐引用方式 GB/T 7714 | Gao, GY,Zhang, JJ,Liu, Y,et al. Spatio-temporal patterns of the effects of precipitation variability and land use/cover changes on long-term changes in sediment yield in the Loess Plateau, China[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2017,21(9):4363-4378. |
| APA | Gao, GY,Zhang, JJ,Liu, Y,Ning, Z,Fu, BJ,&Sivapalan, M.(2017).Spatio-temporal patterns of the effects of precipitation variability and land use/cover changes on long-term changes in sediment yield in the Loess Plateau, China.HYDROLOGY AND EARTH SYSTEM SCIENCES,21(9),4363-4378. |
| MLA | Gao, GY,et al."Spatio-temporal patterns of the effects of precipitation variability and land use/cover changes on long-term changes in sediment yield in the Loess Plateau, China".HYDROLOGY AND EARTH SYSTEM SCIENCES 21.9(2017):4363-4378. |
入库方式： OAI收割
来源：地理科学与资源研究所
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