依据历年调查资料，对麻池背油松天然林的林分生长结构进行了研究。

Based on survey resources in the past years, natural forest stand structure of Pinus tabulaeformis in Machibei was studied.

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因此，在制定正确的森林经营决策之前，首先必须建立林分生长与收获模型，以掌握林分结构、生长动态、货币收获变化规律，并预测林分对即将实施措施的反应。

Thus, the growth and obtain models must be established before making the proper manage decision, the structure and grow dynamic and obtain change rule of the stand will be grasped by the models.

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但蓄积量大幅下降，林分的龄组、密度结构严重失调，林分生长量偏低。

But stand volume descents to a great extent, age class and stand density structure are maladjusted badly, and the number of stand growth is low.

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