山东省禹城市耕层土壤有机质含量变化的空间变异

Spatial Variance of Surface Soil Organic Material Content in Yucheng,Shandong Province

通过与第二次土壤普查剖面点相同位置采样、分析,运用地统计学方法,研究了禹城市耕层土壤有机质含量变化的空间分布,结果表明:研究区耕层土壤有机质含量普遍提高,增加幅度变化于-4.35gkg-1～32.53gkg-1,平均增加12.949gkg-1。土壤有机质含量变化的半变异函数可以球状、圆形、指数、高斯等模型表征,随机性因素如施肥、耕作措施、种植制度等各种人为活动是土壤耕层有机质含量变化空间分布的主要因素,土壤有机质含量增加的原因主要是秸秆还田面积增加、大量氮肥的使用;而增加幅度小甚至为负值的剖面主要是由潮湿变干燥、林地转为耕地所导致。

Soil organic matter is very important for soil fertility. In this paper, the spatial variance of soil organic matter was studied with geostatistics method and the soil samples collected at the same sites in 2006 and 1982 （Dring the Second General Soil Survey）. The results showed that soil organic matter contents increased from -4.35g kg^-1-32.53g kg^-1 with average of 12.949g kg^-1, the semi-variance function could be expressed using spheric, round, exponential, and gauss model. The reasons of raising soil organic matter were mainly focusing on fertilization and cultivation, especially the straw returning measure.