Based on grain size analysis and soil moisture determination

soil moisture environment

causes of steppe degeneration

and vegetation suitable to developing were investigated at Shaliuhe Town in northern Qinghaihu Lake.The results show that the soil in the studied area is mainly composed of coarse silt.Soil moisture was rich in 2009as a rainy year

and the seeping depth of gravity water reached 1.3min the rape land and about 0.5min the grass land

respectively.Soil moisture contents differed for various vegetation types

but decreased consistently with the depth.Soil moisture contents 0.8munder the surface ranged from 8%to 11%for the majority of the grass lands

developing a weakly or moderately dried soil layer.This indicated insufficient soil moisture conditions and imbalanced water budgets

implying afforestation might not be suita-ble for this area.As dried soil layers extensively developed

drought-resistant grasses and other crops that consume less water are more desirable

in order to prevent water level recession of the lake.The cultivation area of water consuming plants like rape should be limited

and the exploitation of water resources from the rivers into Qinghai Lake should be well controlled.