【摘要】 在地理信息系统的支持下,利用地统计学方法,初步分析杭埠河流域土壤全氮和有机质的空间变异特征,并利用Kriging插值法绘制了土壤全氮和有机质的空间分布图.结果表明:研究区域内土壤全氮块金方差与基台值之比C0/(C0+C)在26.47%~27.55%之间,具有中等程度的空间变异,是由结构性因素和人为活动等随机因素共同作用的结果,有效变程为43 km;土壤有机质块金方差与基台值之比C0/(C0+C)在13.15%~33.33%之间变化,具有强的空间相关性,主要是由结构性因素引起的,而人为等随机因素影响较小.土壤全氮和有机质的空间分布相关性明显,相关系数为0.813 6,空间分布格局基本一致,具有西南山区含量较高,东北滨临巢湖的平原区次之,中部丘陵地区和沿河两岸的岗区最低,反映出了地貌变化对研究区域土壤全氮和有机质空间分布的影响.更多还原

【Abstract】 Studying on the spatial variability of soil N and organic matter is helpful to develop optimal fertilization and management practices to control the non-point sources of N pollution.Geostatistics is useful for characterizing and mapping spatial variability of soil propoties.A geostatistics method,combined with geographic information system(GIS) was applied to the spatial variability of total soil N and organic matter in Hanbu River watershed.The isotropic semivariograms showed the ratio of nugget to sill was 26.47%～27.55% for total soil N,and 13.15%～33.33% for organic matter,indicating that the spatial autocorrelation of organic matter exceeds the total soil N in the study area.The autocorrelation range is 43 km for total soil N,26 km for organic matter,indicating that the spatial heterogeneities were mainly produced by structural factors.The map of total soil N and organic matter interpolated through Block Kriging depicted that total soil N and organic matter contents had the same distributed patterns.更多还原