不同取样尺度农田土壤速效养分空间变异特征初步研究

AGRICULTURAL RESEARCH IN THE ARID AREAS(2005)

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Abstract
以3种取样间距(100 m、50 m、25 m)进行网格取样,对土壤速效养分的空间变异性进行研究.结果表明:取样间距对土壤速效养分的含量水平、变异系数影响不显著;取样间距对合理取样数目具有一定的影响,合理取样数目分别为:碱解氮(71)、速效磷(36)、速效钾(18).土壤速效养分的空间变异性主要受结构因素影响,但碱解氮与速效磷受随机因素影响强于速效钾.利用Kriging内插法绘制了不同取样间距土壤速效养分的等值线图.
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Key words
available soil nutrients,soil nutrients,spatial variability,farmland
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