land sediment
1.Reconstruction of the last Glaciation incised valley is mainly performed on the basis of the following proofs: (1) the valley floor is sndace of unconformity by ercoion as a result of erosion and dissection of river during sea level flood land sediment in the valley deposited during late glacial sea level ascension, with an age of 12000-7500 year;
7.Key harnessment effectively controlled the soil loss in these areas with the sediment yield ratio reduced by over 50%, the eec-environment changed benignly, land use structure tended to be reseasonable,pure income per capita increased by 1. 3 to 2 times, the ratio of peasant households which got rid of poverty occupied 91%.
