哀牢山亚热带常绿阔叶林表层矿质土壤的空间异质性格局

Spatial Variability Pattern of Surface Mineral Soil in Subtropical Evergreen Broad-leaved Forest in Ailao Mountains

为了揭示亚热带常绿阔叶林表层矿质土壤碳及常量养分的空间异质性格局,以常用的网格法,调查了哀牢山的亚热带常绿阔叶林。结果发现,土壤全磷、可交换性钙、可交换性镁的半方差函数模型为指数模型,且变程接近300m,具中等程度的空间结构变异;土壤全碳、全氮、可交换性钾的的半方差函数模型为线性模型,在现有取样尺度上表现为随机变异。可交换性土壤离子的变异系数大于土壤碳、氮、磷。在现有取样尺度上,哀牢山亚热带常绿阔叶林的部分土壤养分空间异质性表现出结构变异。

In order to reveal spatial heterogeneity pattern of surface mineral soil carbon and macro-nutrients in subtropical evergreen forests, the author investigated carbon and nutrients variability of surface mineral soil （0-10cm） in subtropical evergreen broad-leaved forest in Ailao Mountains, and employed grid-sampling method to collect soil samples and found that spatial variability of soil total phosphorus, exchangeable calcium, exchangeable magnesium revealed constructive variation and the effective range of these three variables approach 300m. The models of semi-variogram of soil total carbon, total nitrogen and exchangeable potassium were linear models, which meant that spatial variation of these three variables was non-constructive stochastic variation. It was concluded that： part of soil nutrients in the subtropical evergreen broad-leaved forest exhibited spatially constructive variation on the present sampling scale.