Generation mechanism of woodland runoff and sediment on Loess Plateau under hypo-rainfall—A case study of artificial P.tabulaeformis and secondary natural P.dadidiana stands

Abstract

Abstract: Based on the long-term observation and from the viewpoints of water balance and runoff-and sediment generation,this paper studied the generation processes of runoff and sediment on two typical woodlands,artificial P.tabulaeformis and secondary natural P.dadidiana,and uncultivated slope-land in Loess Plateau under hypo-rainfall.The results showed that within the range of 5.0～50.0 mm rainfall,the total interception of canopy and litter was 15.45%～56.80% for P.tabulaeformis and 20.56%～47.81% for P.dadidiana,and decreased with increasing rainfall.Woodlands had a higher soil water infiltration capacity than uncultivated slope-land,especially in 0～20 cm soil layer.Both the two woodlands did not generate runoff under regular rainfall.Under the assumed rainfall of 2.5 mm·min^-1 intensity and 30 min duration,P.dadidiana stand did not produce runoff,but the runoff velocity and sediment-carrying capacity of uncultivated slope-land were 23.5 times,and runoff shearing stress and energy were 8 times as much as P.tabulaeformis stand.The runoff-and sediment generation on P.tabulaeformis stand decreased by 87.6% and 99.4%,respectively,compared with those on uncultivated slope-land,which was well accorded with the average observed value in runoff plots during 1988～2000.The theoretical analysis on the generation mechanism of woodland runoff and sediment may be effective to evaluate the benefits of forest in soil and water conservation.

Key words: Soil and water conservation, Runoff-and sediment generation, Forest stand, Loess Plateau

CLC Number:

S157.1

PAN Chengzhong, SHANGGUAN Zhouping . Generation mechanism of woodland runoff and sediment on Loess Plateau under hypo-rainfall—A case study of artificial P.tabulaeformis and secondary natural P.dadidiana stands[J]. Chinese Journal of Applied Ecology, 2005, 16(9): 1597-1602.

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