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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林木枯损率模型是树木生长与收获模拟系统中的一个重要组成部分。

Tree mortality model is an important part of tree growth and yield model system.

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