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A study on responses of soil erosion and sediment yield to closing cultivation on sloping land in a small catchment using 137Cs technique in the Rolling Loess Plateau,China

A study on responses of soil erosion and sediment yield to c...

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中国科学院地质与地球物理研究所2003学术年会

作者： FENG Mingyi~(1,4),D.E.Walling~3,ZHANG Xinbao~(1,2) & WEN Anbang~1 1.Chengdu Institute of Mountain Hazards and Environment,Chinese Academy of Sciences(CAS).Chengdu 610041.China 2.State Key Laboratory of Loess and Quaternary Geology.Institute of Earth Environment,CAS,Xi’an 710075.China 3.Department of Geography and Archaeology.Exeter University,Exeter EX4 4RJ.UK 4.Sichuan Teachers College.Nanchong 637002.China

By comparison of volumes and Cs contents of the deposited sediments before and after 1993,changes of specific sediment yields and relative sediment contributions from the gully area and from the inter gully area after closing cultivation on the later area on a small catchment of Zhaojia gully,in the Rolling Loess Plateau,are analyzed in this *** cultivation in a large scale has not resulted in decrease but increase of specific sediment yield of the catchment,in sharp decrease of the sediment yield and the relative sediment contribution of the inter-gully area, and in increase of the sediment yield and the contribution of the gully area,for a short *** mean specific sediment yield of 29650 t km a of 1994-1996 in the catchment was 2.2 times the average value of 13413 t km a for a long *** specific sediment yield of the inter-gully area decreased from the 14335 t km a in 1994 to 7034 t km a in 1995 and 3517 t km a in 1996,while the yield of the gully area varied between 44944 and 62136t km a during the period of 1994-1996 which was much greater than the value of 21118 t km a before *** relative sediment contribution from the inter-gully area decreased from 23% in 1994 to 15%in 1995 and 6%in 1996,while the contribution from the gully area increased from 77%in 1994 to 85% in 1995 and 94%in *** is suggested that compacting of ploughed soils resulted in increasing of the erosion resistance but in decreasing of the precipitation infiltration,therefore, the soil erosion reduced but the runoff amount increased on the inter-gully *** of delivering runoff from the inter-gully area to the gully area should result in activeness of gully erosion and mass movements,consequently,in increase of the total sediment yield from the catchment.

关键词： Loess Plateau closing cultivation gully ara inter-gully area relative sediment contribution 137Cs

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