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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (20): 230-236.doi: 10.11924/j.issn.1000-6850.2011-3348

所属专题： 耕地保护

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

县域耕地地力评价中土壤养分空间插值方法的比较研究

李增兵 赵庚星 赵倩倩 李百红 武婕   

  • 收稿日期:2011-11-10 修回日期:2012-01-05 出版日期:2012-07-15 发布日期:2012-07-15

Comparison of Spatial Interpolation Methods for Soil Nutrients in Cultivated Land Fertility Evaluation

  • Received:2011-11-10 Revised:2012-01-05 Online:2012-07-15 Published:2012-07-15

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摘要：

耕地是农业生产的重要资源，耕地地力评价是耕地质量建设重要手段，与之相关的土壤养分插值技术关系到耕地地力评价精度与可用性。以历城区为研究对象，将历城区划分为历城平原区和丘陵区，分析其采样点养分分布情况、评价指标中涉及的土壤有机质、有效磷、速效钾、有效锌、有效硼的空间变异情况。分别用反距离权重插值法(IDW)和普通克里格插值法(OK)对历城全区、平原区和丘陵区的土壤养分进行插值，通过交叉验证、叠加对比分析等方法比较不同情况下不同插值方法的精度，并对比分析基于不同插值方法的耕地地力评价结果。结果显示，IDW和OK 2种方法都具有较高精度，其中IDW插值方法较适宜于丘陵区，而OK插值方法则适宜于平原区；对于有多种参评元素参与的县域耕地地力评价，采用2种方法的评价结果相差不大。基于实用性与精确性结合原则，IDW方法是县域耕地地力评价养分空间内插的最佳选择。

关键词: 干旱, 干旱, 植被指数, 城市热岛

Abstract:

Farmland is an important resource of agricultural production, and cultivated land fertility evaluation is an important guarantee for quality construction of arable land, soil nutrients interpolation techniques affect the evaluation of farmland accuracy and availability immediately. This paper took data of Licheng County as an example, the City was classified into plain and hilly region based on the landform condition. We analyzed distribution and spatial variation via the sample point data, including organic matter, available phosphorus, rapid available potassium, available zinc and available boron. This paper carried on interpolation of soil nutrients by the model of Inverse Distance Weighted and Ordinary Kriging in Licheng plain and hilly regions. Moreover, we compared the two kinds of interpolation method by the way of cross-validation and comparative analysis. At the same time, compared and analyzed the different interpolation methods based on evaluation results of farmland. In conclusion, both Inverse Distance Weighted and Ordinary Kriging had high precision, Inverse Distance Weighted was the best for interpolation of soil nutrients in hilly region but Ordinary Kriging was suitable for plain. The difference of evaluation results between the two methods for a variety of elements involved in the county farmland was small. Based on the combined principle of practicality and accuracy, Inverse Distance Weighted was the optimal choice of spatial interpolation methods for soil nutrients in cultivated land fertility evaluation.