耕地地力评价中土壤养分的空间插值方法比较研究——以会宁县土壤速效钾为例

土壤养分分布状况是耕地地力评价的重要指标,也是科学施肥的主要依据。土壤属性分析作为耕地地力评价的核心,是评价工作的重点。该研究以甘肃省会宁县土壤速效钾含量为研究数据,用普通克里格、反距离加权法、径向基函数插值3种插值方法进行插值对比研究,交叉验证得出普通克里格球面模型是精度最高的插值方法,可以很好的模拟土壤养分的空间渐变分布。为后期的耕地地力评价和农业生产提供科学依据。

Evaluation of Farmland Soil Nutrient Comparison of Spatial Interpolation Methods --Take Huining County Cultivated Soil Potassium for an Example

Distribution of soil nutrients is an important indicator of soil fertility is the main basis for scientific fertilization. Therefore, the soil properties of cultivated soil fertility evaluation as the core focus of the evaluation work. Spatial interpolation of soil samples by the limited nutrient information, estimating the unknown within a certain range of spatial data, which are all within the space of the nutrient distribution. County in Gansu provincial capital of farmland soil sample to soil available K content of the study, using Ordinary Kriging （OK）, inverse distance weighting method （IDW）, radial basis function interpolation, the sampling of three interpolation methods point interpolation for spatial distribution of soil potassium, cross - validation, so choose the most appropriate comparison would be County interpolation of soil nutrients for later evaluation of farmland and agricultural production and provide a scientific basis.