selective cutting

If the utilization of trees in forested swamps were necessary, we should choose selective cutting rather than clear cutting to reduce methane emission.

在有必要对森林沼泽的树木资源进行利用时，为减少甲烷气体的排放，应该尽量避免进行皆伐，只能进行适当的择伐。

Results showed that for both clear cutting and selective cutting, the skidding efficiencies reduced with increasing skidding time and skidding distance.

结果表明：无论采用皆伐还是采用择伐生产方式，随着集材时间和集材距离的增加，集材效率均降低。

The decrease of draining ditches area may also cause methane emission rates decreasing in the plantations. ( 8) Three forested swamps after selective and clear cutting uptakes less methane than the natural ones, or changed to the atmospheric methane sinks.

排水沟相对面积减少也会导致人工林甲烷排放速率降低。（8）择伐和皆伐都导致3个类型的森林沼泽作为大气甲烷汇的功能降低，或者由大气甲烷的汇转变为甲烷的源。

Study on the density of forestry road network for selective cutting system

低强度择伐伐区林道网合理密度的研究

The experience and lesson of forest management in Heilongjiang province since 1949 were summarized, and the main lessons are as follows: ( 1) over cutting and regeneration lag cutting, big area clear cutting and high strength selective logging;

系统总结了建国以来黑龙江森林经营管理的经验和教训。指出应该吸取的主要教训是：①大砍大造，更新跟不上采伐，大面积的皆伐和大强度的择伐；