老挝奔怒县土壤pH和养分的空间异质性研究

发布时间：2018-11-28 07:37

【摘要】：利用GIS强大的空间分析功能,通过地统计学中的半方差函数对奔怒县土壤表层(0~20 cm)pH值、有机质、碱解氮、有效磷和速效钾等要素的空间异质性特征进行了定量研究。结果表明:pH、有机质、碱解氮、有效磷和速效钾的平均含量分别为5.32、24.01 g kg~(-1)、100.11 mg kg~(-1)、8.81 mg kg~(-1)和118.20 mg kg~(-1)。速效钾的理论模型为stable模型,其余4种的理论模型为指数模型。pH由随机性因素引起的变异程度较小,为0.00%;有机质、有效磷和速效钾显示出中等变异,变异系数为61.73%、69.59%和31.21%,但它们的空间自相关范围具有明显的差异,分别为18.53 km、3.724 km和4.869 km;而碱解氮显示出强变异性,变异系数为79.57%。进而绘制土壤养分的空间分布图,为精准施肥提供有针对性策略。
[Abstract]:Using the powerful spatial analysis function of GIS, the spatial heterogeneity characteristics of soil surface (0 ~ 20 cm) pH), organic matter, alkali-hydrolyzed nitrogen, available phosphorus and available potassium were quantitatively studied by semi-variance function in geostatistics. The results showed that the average contents of pH, organic matter, alkali-hydrolyzed nitrogen, available phosphorus and available potassium were 5.32 渭 g kg~ (-1), 100.11 mg kg~ (-1), 8.81 mg kg~ (-1) and 118.20 mg kg~ (-1), respectively. The theoretical model of available potassium is stable model, and the other four models are exponential model. Organic matter, available phosphorus and available potassium showed moderate variation, with a coefficient of variation of 69.59% and 31.21%, respectively, but their spatial autocorrelation ranges were significantly different (18.53 km,3.724 km and 4.869 km;, respectively). The alkali hydrolyzed nitrogen showed strong variability, and the coefficient of variation was 79.57. Furthermore, the spatial distribution map of soil nutrients was plotted to provide targeted strategies for precision fertilization.
【作者单位】：云南大学资源环境与地球科学学院;
【基金】：云南省应用基础研究计划项目“中高分辨率遥感数据支持下的橡胶林地信息定量识别方法研究(2013FZ002)”资助
【分类号】：S153;S158

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