...长曲线簇中，有一条代表在中等立地条件下，林分优势树高随林分年 龄变化的平均高生长曲线，这条曲线称作导向曲线（guide curve），亦称主曲线或平均指数 曲线。
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用差分法展开导向曲线，编制了单形立地指数表。
Single form site index table was constructed after derived curve was expanded by differential method.
采用解析木导向曲线法编制了辽东地区日本落叶松地位指数表。
Site index tables regarding Japanese larch in eastern Liaoning were mapped out by using stem analysis guide curve.
这表明，筛选拟合的树高——年龄导向曲线回归方程很好地拟合了样本资料，很好地反映了树高的生长过程。
As showed the curve regression equations of tree height-age relations matched the sample data nicely and reflected the trees' grown process nicely.
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