On the basis of field washing experiments

dynamic variation characteristics of soil anti-scourabilitv and its influencing factors were studied under six vegetation types including the conversion of farmland to Minjiang cypress

Minjiang young cypress

Robinia pseudoacacia

the shrub

natural secondary forest and the mixed young stands.The results showed that changes of runoff amount were significant with washing time under different vegetations.Runoff amount increased firstly with the increasing of washing time under different vegetations

and then decreased.Runoff amount of the control(CK)was lower than that of the shrub

and was higher than that of the other vegetations.Sediment concentration was keeping stability after decrease with the increasing of washing time under different vegetations.Sediment concentration was the lowest with the increasing of washing time for the conversion of farmland to Minjiang cypress.Sediment concemrauon was me Lower wm me mcreasmg of wasmng ume for me mixea young stanas

ana zne ume of steady sediment concentration was later than that of the other vegetations. The results also demonstrated that soil anti-scouring index changed in the following order of treatments:the conversion of farmland to Minjiang cvpress>Minjiang young cvpress>Robinia pseudoacacia>the shrubs natural secondary forester the mixed young stands}the control(CK).Under different vegetations

there was significantly negative correlation between soil anti-scouring index and soil bulk density. There was significantly positive correlation between the size of<0.001 mm in micro-aggregate composition and soil anti-scouring index.There was no stges nificantly different between content of the other particles in micro-aggregate scourmg index.There was significantly negative correlation between content of index.composition soil availahle and P and soil anti-soil anti-scourmg.