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【目的】摸清农林复合模式下土壤养分空间变异情况。【方法】以泽普县为例,采用GIS与地统计学相结合的方法对农林复合模式下耕层土壤(0～20 cm)的有机质、全氮、速效氮、速效磷和速效钾等5种养分要素的空间变异特征进行分析;并与二次土壤普查结果对比分析研究土壤养分变化。【结果】研究区耕层土壤各养分含量呈正态分布,变异性表现为:速效磷>速效钾>碱解氮>全氮>有机质;全氮、有机质变异函数曲线符合指数模型,碱解氮、速效磷、速效钾的变异函数曲线符合线性无基台模型。从地理位置上看,5种土壤养分含量总体分布呈现西高东低、南北低、中间高的趋势。与1982年相比,除速效钾外,其他4种养分土壤含量都有不同程度的增加,其中速效磷的增加幅度最大。【结论】研究区内土壤养分含量属于中等偏低水平,应增加有机肥的投入,在重视施用氮磷化肥的基础上,也必须重视钾肥施用,培肥土壤,从而保障耕地的可持续利用和发展。
【Objective】 To find out the spatial variability of soil nutrients under agroforestry model. 【Method】 Taking Zepu County as an example, the soil organic matter, total nitrogen, available nitrogen, available phosphorus and available potassium in topsoil (0-20 cm) under agroforestry model were determined by the combination of GIS and geostatistics. The spatial variability of nutrient elements was analyzed. The changes of soil nutrients were compared with those of secondary soil census. 【Result】 The results showed that the contents of nutrients in the topsoil showed a normal distribution and the variability was as follows: available phosphorus> available potassium> alkali hydrolyzable nitrogen> total nitrogen> organic matter. The curves of total nitrogen and organic matter were in good agreement with exponential model, , Available phosphorus, available potassium function curve in line with the linear model without abase. From the geographical point of view, the five kinds of soil nutrient content of the overall distribution of West High East low, low north and south, the middle of the high trend. Compared with 1982, in addition to available potassium, the other four nutrients have different levels of soil, in which the available phosphorus increased the most. 【Conclusion】 The content of soil nutrient in the study area belongs to the middle-low level, and the input of organic fertilizer should be increased. On the basis of emphasizing the application of N and P fertilizers, the application of K fertilizer and the fertilization of soil must also be emphasized, so as to ensure the sustainable utilization of cultivated land and development of.