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利用GPS定位,在陕西省汉阴县采集耕地表层土样(0～20 cm)1500个,应用经典统计学与地统计学方法,对汉阴县耕层土壤全氮含量的空间变异特征进行了研究。结果表明:汉阴县土壤全氮的平均含量为1.20 g.kg-1,为中等偏上水平;土壤全氮的变异系数为0.31,为中等变异程度。通过各向同性和各向异性的半方差模型分析可得,汉阴县全氮含量空间变异以各向同性指数模型拟合效果最好,其块金系数为0.425,表明全氮空间变异主要是由结构性因素引起的。土壤全氮空间分布呈现中部高、东北和西南低的趋势,这主要受当地地形、土壤类型和施肥状况等因素的影响。
Using GPS positioning, 1500 surface soil samples (0 ~ 20 cm) were collected from Hanyin County in Shaanxi Province. The spatial variability of soil total nitrogen in Hanyin County was studied by using classical statistics and geo-statistic methods the study. The results showed that the average content of soil total nitrogen was 1.20 g · kg-1 in Hanyin County, which was moderately upper. The coefficient of variation of soil total nitrogen was 0.31, which was a moderate degree of variation. Through the isotropic and anisotropic model analysis, it can be concluded that the spatial variation of total nitrogen in Hanyin County is best fitted by the isotropic index model with a gold coefficient of 0.425, indicating that the spatial variability of total nitrogen is mainly Caused by structural factors. Spatial distribution of soil total nitrogen showed a middle high, northeast and southwest low trend, which is mainly affected by the local topography, soil types and fertilization conditions and other factors.