海河低平原盐渍区土壤养分空间变异性研究
Study on spatial variability of soil nutrient in saline area,Lower Haihe Plain
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摘要: 应用地统计学方法分析研究海河低平原盐渍涝洼地2700m×2100m尺度土壤6个主要养分属性和全盐量的空间变异结构结果表明，在轮荒、撩荒半自然状态下土壤全N、速效氮、速效磷、速效钾及有机质等含量的空间变异性存在着良好的半方差结构，而全P半方差结构尚难理想的确定。半方差曲线图遵从指数和球函数等理论模型，最大相关距离分别在340～1173m，结构方差在基台值中所占比例均较大，达40%以上。Abstract: The spatial structures of six soil properties in the saline and waterlogging land(2700m×2100m) region in Lower Haihe Plain are analyzed by means of the geostatistics.The results show that there exists perfect semivariance structure for the spatial variability of main soil attributes such as total N,available N,available P,available K and organic matter,other than total P,under the rotation of tillage situation.The semivariograms can be fitted by exponential and spherical models and the limit distance of spatial correlation is 340～1173m.The proportion of structural variance to sill is in a high level,over 40%.
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Key words:
- Saline and waterlogging area /
- Soil nutrient /
- Spatial variability
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