selective cutting

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。

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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；

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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

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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。

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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。

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