environmental variance meaning in English

环境变量
环境方差

Beginning with the problem of interlaced region between farming and herding , the boundary line of the interlaced region is calculated based on grid with 10km grid ; then the relation among land use of the region , soil erosion and erosion region is analyzed ; based on factor classification , no useful factors were neglected and stepwise regression method was used to analysis the drive of land use change ; fractal method was applied to analysis the degradation of land - use and relation among land use , soil erosion and wind - water erosion zone ; environmental variances are introduced to establish characteristic index of land use change and analysis the effect of land use change on soil erosion
从农牧交错带的实质问题入手，基于10公里网格，计算农牧交错带的界限；在此基础上分析农牧交错带的土地利用、土壤侵蚀及与风水侵蚀带的关系；在因子分层的基础上，剔除不需要因素，采用逐步回归的方法，进行土地利用变化驱动力分析；运用分形方法分析土地利用的退化，并分析土地利用与土壤侵蚀的关系，引入环境变量，建立土地利用变化特征指数，分析土地利用变化对土壤侵蚀的影响。