Studies on the Low of Soil and Water Losses in New Forestation Land of Chinese Fir

Three runoff plots were set up in the new forestation land of Chinese fir after control burning in Shaowu,Fujian province in 1992.The laws of changes in rain height,surface losses rate of soil and water were observed and studied.The results indicated that surface runoff and soil erosion on bare land is much more than those on new forestation land after control burning.Runoff coefficient of bare land is 3.8 times as that of the new forestation land.Surface runoff and surface soil losses lowered greatly after tending and earthing up of level terrace.Seasonal variations of surface runoff were mainly in fluenced by seasonal distribution of rainfall.The main reasons which caused serious surface runoff are heavy rains and rain storms.