Influence of Vetiveria Zizanioides Hedgerow on the Sediment Deposition of Purple Soil Slope in the Three Gorges Reservoir Area
Taking the purple soil slope in the Three Gorges Reservoir Area as the research object,the present study employed the rare earth element tracing method to differentiate sediment sources.Simulated rainfall experiments were conducted under three slope conditions(CK:control slope;P:hedgerow and R:only hedgerow root)at two rainfall intensities(60 mm/h and 120 mm/h)to assess the effects of Vetiveria Zizanioides hedgerows on sediment deposition.The findings revealed that the sediment primarily deposited in the middle and lower parts of the slope(in the tracer sections of 0～40 cm and＞40～140 cm).Compared with the control slope(CK)condition,the deposition rates increased by 42.88％and 79.06％under the R and P slope conditions,respectively.Under the CK slope condition,the contribution of each slope section to the total deposition increased with the slope position under a rainfall intensity of 60 mm/h.Specifically,the tracer section ranging from＞340 to 440 cm reached a contribution rate of 60.13％;however,under a rainfall intensity of 120 mm/h,the contribution of each slope section to the total deposition exhibited a fluctuating pattern.Under the P and R slope conditions,the contribution increased in the tracer sections ranging from＞140 to 240 cm and from＞340 to 440 cm,but decreased in the tracer section ranging from＞240 to 340 cm.Therefore,the presence of hedgerows significantly altered the sediment distribution on the slope and the sedimentation source of deposition,leading to a reduced contribution of the upper slope and an increased contribution of the middle and lower slopes to the total deposition.
the Three Gorges Reservoir Areadeposition distributionhedgerowrare earth element tracingpurple soil
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