globalchange  > 气候变化事实与影响
DOI: 10.5194/hess-21-4363-2017
Scopus记录号: 2-s2.0-85029095433
论文题名:
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
作者: Gao G; , Zhang J; , Liu Y; , Ning Z; , Fu B; , Sivapalan M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期:9
起始页码: 4363
结束页码: 4678
语种: 英语
Scopus关键词: Catchments ; Climate change ; Land use ; Landforms ; Precipitation (meteorology) ; Revegetation ; Runoff ; Soil conservation ; Surface measurement ; China's loess plateaux ; Coherent spatial patterns ; Land use/cover change ; Precipitation variability ; Sediment concentration ; Space-time variability ; Spatiotemporal patterns ; Vegetation restoration ; Sediments ; anthropogenic effect ; catchment ; land cover ; land degradation ; land use ; precipitation (climatology) ; rainfall ; revegetation ; sediment analysis ; sediment yield ; soil erosion ; spatiotemporal analysis ; streamflow ; China ; Loess Plateau
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 70g % of the sediment load reduction, whereas the contribution of precipitation was less than 30g %. 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. © Author(s) 2017.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79071
Appears in Collections:气候变化事实与影响

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作者单位: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China; Joint Center for Global Change Studies, Beijing, China; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; Department of Geography and Geographic Information Science, University of Illinois at Urbana-Champaign, Champaign, Illinois, United States; Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States

Recommended Citation:
Gao G,, Zhang J,, 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,2017-01-01,21(9)
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