煤矿区次生裸坡土壤抗冲性的空间变异特征

Spatial Heterogeneity of Soil Anti-scouribility in Coal Mining Secondary Bare Slope

为定量描绘矿区次生裸坡土壤抗冲性特征,以山西潞安王庄煤矿矸石山为例,运用传统统计学与地统计学相结合的方法,对煤矸石山土壤抗冲性进行空间变异特征研究。结果表明:矸石山土壤具有明显的空间异质性特征。土壤抗冲指数的最适理论模型为指数模型。在2,2.5,3,4m共4个步长间隔范围内,拟合模型的精度随步长间距的增大而提高。土壤抗冲指数的块金系数C0/(C0+C)在10.91%～13.68%之间,具有强烈的空间自相关性,且空间变异主要受结构因素的影响。土壤抗冲指数的空间分布表现为条带状和斑块状的分布特点,且主要分布在0.06～0.12min/g之间,占83.02%。沿坡长方向,土壤抗冲指数呈现先减小后增大的趋势,且极显著服从于方程ANS=0.0001 X2-0.0048X+0.1166。

In order to quantitatively describe soil anti-scouribility in mining secondary bare slope,the spatial heterogeneity of soil anti-scouribility in Wangzhuang coal gangue pile of Lu An,Shanxi province,was studied by the methods of classic statistics and geostatistics.The results showed that soil of gangue pile has obvious spatial heterogeneity.Exponential model fitted best for soil anti-scouribility index（ANS）.Among the long spacing of 2,2.5,3 m and 4 m,the longer the long spacing was,the more accurate the model simulation was.And ANS showed strong spatial autocorrelation because nugget coefficient C0/（C0＋C） was in the range of 10.91%~13.68%.The variability of ANS was mainly controlled by structural factors.The spatial distribution of ANS was apparently strip and block,the most level was distributed between 0.06~0.12 min/g,accounting for 83.02%.From top to foot of slope,ANS first decreased and then increased.ANS obviously followed the equation of ANS=0.0001X2-0.0048X＋0.1166.