Response of Sediment Sources in Wangjiagou Small Watershed to Changes in Erosion Environment
In the past 30 years,significant changes have occurred in the erosion environment of the Wangjiagou watershed.After a series of comprehensive control of soil and water loss,ecological construction projects,and the implementation of returning farmland to forest and grassland,the vegetation in the basin has been effectively restored.In order to explore the response of sediment sources and erosion characteristics to the changing environment in the Wangjiagou watershed,this project selected the Wangjiashan small watershed in the watershed and used composite fingerprint technology to determine its sediment sources and contribution rates.Corresponding to the target sediment deposition,the impact of different types of sediment sources on erosion and sediment production was analyzed.The study showed that:(1)the average contribution rate of sediment source areas was as follows:gully walls(58.64％)＞gully slopes(21.29％)＞sloping farmland(20.28％).Gully walls are the main sediment producing areas in the small watershed,and future soil and water conservation work in the study area should focus on the management of gully walls.(2)Slope farmland is no longer the main source of sediment in the small watershed,which shows that soil and water conservation measures such as slope farmland management have their benefits.(3)The contribution rate of forest and grassland land to sediment is very low,which shows that the project of returning farmland to forest and grassland effectively reduces the erosion and sediment production in small watershed.(4)On the basis of maintaining existing governance achievements,it has increased vegetation coverage on gully slopes and strengthened slope and channel management.The results of this article can guide the local area to further improve soil and water conservation measures and prevent soil erosion.
Composite fingerprintingSediment sourcesContribution rate of sedimentSoil erosion
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NSTL
万方数据
