Study On Soil Water Characteristic And Suitable Density Of Artifical Robinia Psedoaeacio On Slope Of West Of Shanxi Province

Water was a crucial factor influencing vegetation restoration and eco-environmental reconstruction in Loess Plateau region. So the vegetation construction should be premised on the water resources bearing capacity of the region, rational collocated variety of tree, selected a proper stand density, made the most of water resource and land resource, improved the productivity, there by improved eco-environment construction.The research first analyzed the character of 20-year precipitation of experimental watershed, by means of variability of mean-annual precipitation and mean-month precipitation, we could reach a conclusion that the distribution of precipitation wasn't proportional.Through studying spatial and temporal change of soil moisture of different stand, we got that mixed forest could not only make better use of water in the soil, but also stabilize the soil moisture. Compared the soil moisture content of different site types: semi-shady slope>semi-sunny slope >sunny slope, the mean different is significant among three stands.Through analyzing the photosynthetic rate, transpiration rate of Robinia psedoaeacio and all influential factors, we got that environmental factors and vegetation factors had different effect on two characteristic, all factors reacted on each other and made common impact on them.Through studying productivity of Robinia psedoaeacio under different site types, we could draw a conclusion: soil moisture restricted the size of all growth factors of different slope, established the relevant quadric equations of factors and density. According to precipitation-balance principle, we could get reasonable density combined with soil water and evaporation.