Based on runoff plot monitoring for different measures

the Sanchahe small watershed with the typical black earth in Binxian County

Heilongjiang Province was chosen as a research object.Six plots which include buffer strips

shrub barrier

contour cultivation

horizontal pit(planting tree in pit)

denuded land and the ridge along slope were observed for two years.Results show that the amounts of soil erosion by horizontal pit

shrub barrier

contour cultivation

buffer strips

and the ridge along slope are reduced by 99.14%

97.65%

90.66%

87.7% and 58.72%

respectively

compared with denuded land.The horizontal pit is the best of all the soil and water conservation measures

whereas the ridge along slope is the worst.Runoff curve numbers are calculated for different soil utilizations.The study has provided a scientific basis for comprehensively preventing soil and water loss

choosing measures and protecting ecological environment in the future.