当长叶松(Tetal—tvee)的所有地上部分被采伐后,只比常规采伐多获得16—20％的生物量,这部分增加的生物量其质量却较差,这是由于湿度大、树皮含水量高、木材比重低的缘故。另外,这种采伐还加速了某些重要的土壤养分的损失。硬材林分的全树采伐,比常规采伐额外增加生物量30—100％,而且作燃料和纤维的生物量的质量也比松木林分高。虽然硬材林分的全树采伐所引起的养分损失是常规采伐的2—3倍。但是其养分的损失与长叶松树相比还是少得多。因为轮伐期一般比较长,土壤中养分 When all aerial parts of Tetralo-tvee were harvested, only 16-20% more biomass was obtained than conventional harvesting, the mass of this increased biomass was poorer due to high humidity, Leather moisture content, low proportion of wood sake. In addition, this logging has also accelerated the loss of some important soil nutrients. Whole-tree harvesting of hardwood stands adds an additional 30-100% of biomass to conventional harvesting, and biomass for fuel and fiber is also higher than for pine stands. Although nutrient loss caused by whole-tree harvesting of hardwood stands is 2-3 times more than conventional harvesting. However, its nutrient loss is still much less than that of hay pine. Because the rotation is generally longer, soil nutrients