Based on the analysis of soil water holding capacity

water interception of litters

soil infiltration ability and soil and water loss regime

the soil water conservation functions of several vegetation types Pinus yunnanensis forest

Pinus armandii forest

Pinus yunnanensis Quercus variabilis forest

Pinus yunnanensis Alnus nepalensis forest

Alnus nepalensis forest

Lithocarpus dealbatus forest

Quercus aquifolioides forest in Zhujiang fountainhead region were studied.The results indicates that:(1)due to the rich litters and its fast decomposition

the broad leaved forests have the strongest soil infiltration ability and water holding capacity

next the broad leaved and coniferous mixed forests

the coniferous forest is the poorest.(2)the surface runoff are increase by degrees that is the broad leaved and coniferous mixed forests

the broad leaved forests

the coniferous forest in turn.But there is a marked differences of which the highest runoff of Pinus yunnanensis needleleaved forest is 2.18 times of that the lowest Quercus aquifolioides forest and the highest silt amount of Pinus yunnanensis forest is 25.65 times of that the lowest Pinus yunnanensis Quercus variabilis mixed forest while a minors between the broad leaved forests and the broad leaved and coniferous mixed forests.(3)the soil water holding capacity of coniferous forest is poor while the broad leaved forests and the broad leaved and coniferous mixed forests are higher.