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题名: Attribution of climate change, vegetation restoration, and engineering measures to the reduction of suspended sediment in the Kejie catchment, southwest China
作者: Ma, X.1, 2, 3; Lu, X. X.4; van Noordwijk, M.5; Li, J. T.6; Xu, J. C.1, 2
刊名: HYDROLOGY AND EARTH SYSTEM SCIENCES
关键词: UPPER YANGTZE-RIVER ; LOESS PLATEAU ; NONPARAMETRIC-TESTS ; WATER-QUALITY ; YELLOW-RIVER ; SWAT MODEL ; CHECK DAMS ; LOAD ; IMPACTS ; EROSION
英文摘要: Suspended sediment transport in rivers is controlled by terrain, climate, and human activities. These variables affect hillslope and riverbank erosion at the source, transport velocities and sedimentation opportunities in the river channel, and trapping in reservoirs. The relative importance of those factors varies by context, but the specific attribution to sediment transfer is important for policymaking, and has wide implications on watershed management. In our research, we analyzed data from the Kejie watershed in the upper Salween River (Yunnan Province, China), where a combination of land cover change (reforestation, as well as soil and water conservation measures) and river channel engineering (sand mining and check dam construction) interact with a changing climate. Records (1971-2010) of river flow and suspended sediment loads were combined with five land-use maps from 1974, 1991, 2001, 2006 and 2009. Average annual sediment yield decreased from 13.7 t ha(-1) yr(-1) to 8.3 t ha(-1) yr(-1) between the period 1971-1985 and the period 1986-2010. A distributed hydrological model (Soil and Water Assessment Tools, SWAT) was set up to simulate the sediment sourcing and transport process. By recombining land-use and climate data for the two periods in model scenarios, the contribution of these two factors could be assessed with engineering effects derived from residual measured minus modeled transport. Overall, we found that 47.8% of the decrease was due to land-use and land cover change, 19.8% to climate change, resulting in a milder rainfall regime, 26.1% to watershed engineering measures, and the remaining 6.3% was due to the simulation percent bias. Moreover, mean annual suspended sediment yield decreased drastically with the increase of forest cover, making diverse forest cover one of the most effective ecosystems to control erosion. For consideration of stakeholders and policymakers, we also discuss at length the modeling uncertainty and implications for future soil and water conservation initiatives in China.
出版日期: 2014
卷号: 18, 期号:5, 页码:1979-1994
DOI标识: 10.5194/hess-18-1979-2014
语种: 英语
ISSN号: 1027-5606
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/18215
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Kunming Inst Bot, Ctr Mt Ecosyst Studies, Kunming 650204, Peoples R China
2.World Agroforestry Ctr, Kunming 650204, Peoples R China
3.Yunnan Inst Environm Sci, Kunming 650034, Peoples R China
4.Natl Univ Singapore, Dept Geog, Singapore 117570, Singapore
5.World Agroforestry Ctr, Bogor 16001, Indonesia
6.Baoshan Water Resource & Hydrol Bur, Baoshan 678000, Peoples R China

Recommended Citation:
Ma,X.;Lu,X.X.;van Noordwijk,M.;Li,J.T.;Xu,J.C..Attribution of climate change, vegetation restoration, and engineering measures to the reduction of suspended sediment in the Kejie catchment, southwest China,HYDROLOGY AND EARTH SYSTEM SCIENCES,2014,18(5):1979-1994
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