Ӧ����̬ѧ�� 2005, 16(09) 1597-1602  DOI:      ISSN: 1001-9332 CN: 21-1253/Q

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Generation mechanism of woodland runoff and sediment on Loess Plateau under hypo-rainfall

PAN Chengzhong 1,2,3��SHANGGUAN Zhouping 1

1State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation,Chinese Academy of Sciences, Yangling 712100,China;2Key Laboratory of Soil and Water Conservation and Desertification Combating,Education Ministry��Beijing Forestry University, Beijing,100083,China;3Graduate School of Chinese Aademy of Sciences, Beijing,100039,China

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.

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