Soil infiltration characteristics of water conservation forest in Yuanyang terrace were studied with double-ring method under six typical plantations(Alnuscremastogyne(Ⅰ)

Alnuscremastogyne(Ⅱ)

Cunninghamia lanceolata(Ⅲ)

Di l leniaindica L inn.(Ⅳ)

Cunninghamia lanceol ata+Quer cus cerr i s(Ⅴ)

Castanopsis or thacantha F ranch.(Ⅵ)) in May to June

2010.Results showed that(1) Soil infiltration was closely related with soil physicochemical properties and litter water-holding abilities

etc.The infiltration rate was positively related with soil noncapillary porosity

aeration porosity

noncapillary capacity

total porosity

saturated water content

soil organic matter

soil total N

total K

hydrolysis N and litter water holding ability

and negatively related with soil bulk density

capillary porosity as well as capillary moisture conntent.(2) There existed great difference under different vegetations for initial

steady-state and mean infiltration rate.Initial in filtration rate followed the order of Ⅵ>Ⅲ>Ⅴ>Ⅵ>Ⅱ>Ⅰhillsides; both steady-state and mean infiltration rate followed the order of Ⅴ>Ⅲ>Ⅵ>Ⅳ>Ⅱ>Ⅰ> hillsides.These results suggested infiltration performance in Yuanyang terrace area forest soil was good with permeability index of each plantation soil larger than waste hillsides.Soil permeability under Cunning hamialanceolata and Cunning hamialanceolata+Quercuscerris vegetation was the best.