The spatial heterogeneity and distribution pattern in surface soil layer(0-10 cm) in mixed broad-leaved koren pine forest gap in Xiao Xing'an Mountains were analysed by the methods of the traditional statistics and geo-statistics.The results showed that:pH(CV=5.28%) and available potassium(CV=7.33%) showed weaker variability,other chemical indices exhibited moderate variability.The theoretical models of variation function curve of soil pH,organic matter,total nitrogen,total phosphorous,ammonium nitrogen,nit...