茎根比是苗木地上部分与地下部分（重量或体积）之比，反映出苗木根茎两部分的平衡状况。实际上就是苗木水分、营养的收支平衡问题。也有人采用根孝比，它与茎根比互为倒数。
造林成活率和当年生长量与茎根比和高径比关系密切。
The survival rate and growth of the first year showed a close relation with shoot-root ratio and height-diameter ratio.
通径分析表明，比叶面积不仅受叶重、茎重、根重的影响，而且受3者间交互作用的影响。
Moreover, path analysis showed that SLA was influenced not only by root weight, stem weight and leaf weight but also by their interaction effects(Fig. 3, Table 7).
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