Study on spatial variability of soil nutrients for Moso bamboo forest in Fengxin

The characteristics of soil nutrition spatial variability have been quantitative studied using semi variogram of geostatistics function in Moso bamboo(Phyllostachys heterocyla cv.Pubescens) forest of Fengxin.The results showed that the soil nutrient had semi-variance structure in bamboo forest,and most of them were spherical model.The soil variance distance was ranged between 32 m and 398 m in Fengxin bamboo forest.Sample distance ranged from 15 m to 20 m can satisfy the requirement of the soil spatial variance evaluation of bamboo forest.The spatial correlation of N,P,K was low,and the influences from man-made interference,fertilization and some other measures on soil available N,P and K were larger than soil Ca,B,Fe and Mg.The order of fraction value of Fengxin bamboo forest soil nutrition was: Cu> Mn> total P> Zn> P> N> Fe> Mg> S> OM> Ca> B> total K> total N.Long-term fertilization could increase the homogenization of soil nutrient spatial distribution.The variance of soil nutrient structure was bigger than the random variance,and the influence of the internal nature on soil(soil minerals and topography) was bigger than the anthropic factors(cultivate management level and fertilizer measures).