杉木种源胸径生长地理变异规律
（1）“krige”空间内插技术：
点内插的“krige”线性系统方程：
式中，r（pi,pj）为观测点pi和pj之间的半方差；r（pi,p0）为半方差曲线模型计算出点pi与内插点p0之间的半方差数值；Φ为与方差最小化有关的拉格朗日乘数。
（2）空间半方差曲线新模型：
多项式拟合模型：
参考文献
洪伟，吴承祯：杉木种源胸径生长地理变异规律的研究。植物生态学报，1998，22（2）
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