Abstract: In order to ascertain the distribution rules of the Horqin sand soil with Ulmus pumila open forest after Grain for Green,this paper uses geostatistical methods to analyze the correlation,spatial variability and distribution of soil properties in Wusitu natural reserve area of eastern Horqin with Ulmus pumila open forest. The results show the spatial variability of soil pH is weak,but the soil total nitrogen,the soil organism,soil available N and available P have a medium spatial variability. If using the theoretical model of the GS+ and software automatically fitted variation function,the soil pH is spherical model,the soil total nitrogen and organism are linear model,the soil available N is exponential model,and the soil available P is Gaussian model. The soil total nitrogen and organism demonstrate a pure nugget effect with a constant spatial variability at a small scale. The pure nugget effect is only influenced by the stochastic factors not by the structural factors,and it has little obvious variation rules. However,the ratio of the soil pH,the soil available N and the soil available P is less than 25% with a strong spatial relevance. The random part caused little spatial variability. Only except the available nitrogen,the other four soil properties are uniform in spatial distribution. Therefore,it can infer the available nitrogen may be the critical element of the ecological restoration here. After the human’s destruction for a long time in history,the restoration of land vegetation and soil nutrient are not synchronous. The latter is slower than the former. So the recovery of Ulmus pumila open forest grassy ecosystem requires a long-time closing hillside to facilitate afforestation.

Key words: Ulmus pumila open forest, grain for green, soil, spatial variability, Horqin sandy land