二龙山油松林土壤养分含量的小尺度空间异质性研究

Study on Small Scale Spatial Heterogeneity of Soil Nutrient Content in Pinus tabulaeformis Forest in Erlong Mountain

为了分析二龙山油松林土壤养分空间分布格局形成的原因,试验采用地统计分析法,研究了二龙山油松林土壤养分含量的小尺度空间异质性。结果表明,在硝态氮、铵态氮、有效磷、有效钾的变异特征体现上,样地1(硝态氮变异系数105.01%、铵态氮变异系数109.84%、有效磷变异系数90.24%、有效钾变异系数91.33%)表现出来的变异性特征属于强变异,而样地2(硝态氮变异系数74.89%、铵态氮变异系数82.86%、有效磷变异系数28.43%、有效钾变异系数22.14%)和样地3(硝态氮变异系数62.06%、铵态氮变异系数78.12%、有效磷变异系数24.38%、有效钾变异系数20.94%)表现出来的变异性特征属于中等变异,原因主要是受微地形的影响;就含量异质性而言,研究区域土壤中硝态氮含量(14.18 mg/kg)高于铵态氮含量(11.92 mg/kg)。土壤有效钾的变异趋势在3块样地中均表现为无基台值线性模型,无法确定其空间结构,这可能与样地的人为干扰有关。

In this paper,the spatial heterogeneity of soil nutrient content in Pinus tabulaeformis forest in Erlong mountain was studied by geostatistical analysis,and the reasons for the spatial distribution pattern of soil nutrients in Pinus tabulaeformis forest in Erlong mountain were analyzed.The results showed that the variation characteristics of nitrate nitrogen,ammonium nitrogen,available phosphorus and available potassium in sample plot 1(the variation coefficient of nitrate nitrogen,ammonium nitrogen,available phosphorus and available potassium were 105.01%,109.84%,90.24%,91.33%,respectively)were strong variation.But the variation characteristics of plot 2(the variation coefficient of nitrate nitrogen,ammonium nitrogen,available phosphorus and available potassium were 74.89%,82.86%,28.43%,22.14%,respectively)and plot 3(the variation coefficient of nitrate nitrogen,ammonium nitrogen,available phosphorus and available potassium were 62.06%,78.12%,24.38%,20.94%,respectively)were medium variation,the reason was mainly affected by micro topography.In terms of content heterogeneity,the nitrate nitrogen content of soil in study area(14.18 mg/kg)was higher than that of ammonium nitrogen(11.92 mg/kg).The variation trend of soil available potassium in three sample plots is linear model without base station value,and its spatial structure can not be determined,which may be related to human disturbance of sample plots.