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县级区域粮田土壤养分空间变异特征评价研究

DOI: 10.7668/hbnxb.2008.S2.074, PP. 319-324

Keywords: 养分平衡,时空变异,地统计学,Kriging插值,GIS

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Abstract:

为了进一步了解县级区域粮田土壤养分的时空变异特征,以山东省惠民县为例,研究了20年来惠民县农业土壤养分循环、平衡与时空变异特征的关系。结果表明,自1985年以来,惠民县农业土壤氮磷过量盈余,而钾基本持平。惠民县土壤养分空间变异特征可以分为3类:①土壤速效钾空间变异符合典型的指数模型,最大自相关距离为16.6km;②土壤全氮空间变异随空间间距的增大而增大,有一定的空间分布规律性;③土壤速效磷空间变异与间距无关,存在纯块金效应。与20年前土壤养分空间变异特征相比,土壤全氮和速效钾的养分空间分布规律变化不大,而土壤速效磷的空间分布规律变化较大。土壤养分时空变异特征与土壤养分循环趋势相一致,说明土壤养分循环与平衡是影响区域土壤养分空间变异发生变化的主要因素。

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