摘要
以面积4 7hm2的农田为研究区,采用网格法选取了92个观测点取样,测定0～15cm耕层土壤的有机质含量。结果表明,土壤有机质表现为强烈的空间自相关,有机质的空间变异性主要由结构性因素引起,其变异函数符合指数模型。
Ninety-two observing points by grid of 20m*20m were made in field 4.7 hm^2.Soil samples were obtained under large of 0～15cm.Organic matter was measured.The results showed that the spatial correlation of soil organic matter at this large scale was moderately dependent,spatial variability of organic matter was primarily caused by structure factor,and the semi-variograms of soil organic matter is best fitted by exponential model.
出处
《青海大学学报（自然科学版）》
2004年第1期13-15,共3页
Journal of Qinghai University(Natural Science)
关键词
有机质
空间变异
半方差函数
soil organic matter
spatial variability
semi-variogram
