Effects on Soil Moisture by Different Soil Preparation Methods and Shrub-grass Patterns in Semi-arid Area

Construction of Caragana korshinskii vegetation and studies on the excessive depletion and regulative recovery were performed with the conjunction of engineering and biotic measures. The results showed that the optimum stereoscopic collocation model with the level-step was Caragana korshinskii-Clinelymas dahuricus, Caragana korshinskii-Mililotus suaveolens and Caragana korshinskii-Achnatherum splendent, the optimum one by level-gouge was Caragana korshinskii-Achnatherum splendens and Caragana korshinskii-Mililotus suaveolens and the optimum one by fish-scale pits was Caragana korshinskii-Mililotus suaveolens, Caragana korshinskii-Achnatherum splendens and Caragana korshinskii-Stipa bungeana. Compared as CK the measure could enhance soil water content of 0 - 500 cml .6% -5.0% by level-step, 1.5% - 3.0% by gouge and 1.1% - 2.7% by fish-scale. At the initial growth stage of 5th, 10th, 15th year, soil water-storage capacity of 0 - 500 cm enhanced 82.84 mm, 56.63 mm, 210.66 mm respectively compared to CK, while in the final stage, enhanced 15.96 mm, 67.64 mm, 50.36 mm respectively. The biomass of shrubs and grass was increased for 97.09% - 104.9% and 3.2-6.5 times.