土地平整、人口稀少、土壤肥力较低，是该林业公司机械化作业、集约化经营、主伐年龄较大的缘由。
The flat land and sparse population and relative lean soil cause forest management to depend on mechanization and intensive cultivation and old-aged harvest system.
如何合理地经营利用好这部分资源，对该省森林永续经营利用起到重要作用，其主伐年龄的确定是关键问题。
How to manage optimally and make use of the resource will play an important role in sustained-yield forest management in Heilongjiang province and determining the age of harvest cutting is the key.
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