Based on the method of sand particle groups analysis

we deal with the sediment production on different sloping lands and the sediment transportation in gully in the granite region in Xia Anxi watershed of Three-Gorge of the Yangtze river.The results show that the maximum in accumulating content of sand particles (diameter<2.00 mm) is the mixed forest land and the pines massohiami forest land

the middle is the uncultivated land and the minimum is the terrace and the cultivated sloping land.The terrace and the cultivated sloping land is the main source of soil erosion and sediment production in the granite sloping land.Every section in the gully has the sand particle distribution of all diameter classes on sloping land.The sediment delivery rate of main gully approaches 100%.