1959年科斯特罗马森工综合管理局工程技术人员制订了一种新的伐区生产工艺,其主要特点是使伐倒木按扇形倒在预先采伐的垫木之上,以保存幼树,为天然更新创造条件。新工艺有以下几个基本特点。首先,采伐带上每批采伐的树木,除垫木以外,均按扇形方向伐倒,梢头集中于集材道上,借树冠支 In 1959, the Costello Roman Integrated Management Plant technicians developed a new cutting-area production process whose main feature is fan-shaped logging of fallen logs over pre-harvested paddocks to preserve saplings as natural Update create conditions. The new technology has the following basic features. First of all, harvesting trees on each batch of logging, with the exception of padded wood, are fan-shaped direction of the felled, stubs concentrated in the timber Road, by crown