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该流域森林资源有限且分布不均；单位蓄积量低，林龄结构不合理；林地利用率不高，病虫鼠害严重。
It also shows low unit stock volume, unreasonable forest age structure, low forestland use ratio and severe pest, disease and rat disaster.
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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