森林主伐harvest cutting 指对成熟林分或部分成熟林木进行的采伐。简称主伐。森林效益随年龄而变化，当达到成熟龄(见森林成熟) 后，林木生长的质和量都会逐渐降低，各种生态效益也日趋削弱。这时应伐去老林，培育新林。
但另一方面，我国用材林面积和单位面积上森林蓄积量都在锐减，这就在客观上增加了伐区区划和主伐调查设计的劳动量和劳动强度。
On the other hand, the area of usable forest and the volume of standing timber in one unit area are descending sharply in our country, which aggravates the labor intensify impersonally.
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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