疏伐越是严格，就越可能有较大的遗传增益。
The more rigorous the thinning, the greater the possible genetic gain.
这些树木可以被砍掉作为造林疏伐的一部分。
疏伐强度与母树林单位面积产种量相关密切；
The thinning intensity and seed production per unit area wereclosely interrelated;
他们还要选择树木做上标记以进行疏伐、砍伐，负责森林保护活动，巡逻公园地区防止破坏。
They also select and mark trees for thinning or logging, manage forest protection activities and patrol park areas to prevent damage.
他们还要选择树木做上标记以进行疏伐、砍伐，负责森林保护活动，巡逻公园地区防止破坏。
They also select and mark trees for thinning or logging, manage forest protection activities and patrol park areas to prevent damage.
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