【摘要】 小兴安岭林区,杨桦林是阔叶红松林皆伐或火烧后首先发生的先锋群落,是恢复红松林的过渡阶段。 试验地设在东北林业大学凉水自然保护区,海拔360—400米。于1983年至1985年进行三年小气候观测和林下更新调查,阐述了杨桦林下的小气候特点与红松天然更新及生长的关系。杨桦林与原生群落相比较,其林下各生态因子发生了显著变化,较适宜红松的更新及生长;30年生的杨桦林下红松天然更新每公顷达4000多株,而且幼苗幼树在年龄上分配比较均匀,恢复红松林的趋势很明显;林下20年生红松幼树平均高是原始林下同龄幼树的4—5倍,地径也增粗4—5倍。 恢复红松林应发挥天然更新的巨大潜力。对杨桦林下红松天然更新不好的地段辅助以人工更新,并适时疏伐上层阔叶树,为林下幼树创造更适宜的生长条件。这是加速杨桦林恢复为阔叶红松林的重要途径之一。更多还原

【Abstract】 The Birch-Aspen forest is the pioneer communities soon after clearcutting or fire of broadleaved Korean Pine forest that will be recovered through its transiting stage in the Xiaoxingan Mountains.The testing stands locate at the Liangshui Natural Reserve from 360m to 400m. This paper demonstrates the relationships between the microclimate features in Birch-Aspen forest and the natural recruitment as well as growth of Korean Pine according to the 3 years microclimate observations and recruitment investigations from 1983 to 1985. Compared with the virgin communities, the Birch-Aspen forest has the ecological factors which has changed a lot and become more adaptable to the recruitment and growth of Korean Pine whose 30 yearst recruitment seedlings under their canopies have the evenly distributed age structure and rejuvenating characteristics of the Korean Pine forest are obvious. The 20 years Korean Seedlings under Birch-Aspen canopies have their mean height and ground diameter 4--5 times of those same age seedlings under virgin Korea Pine forest. We should fully take the great advantages of natural recruitment potential to recover the Korean Pine forest and also show concern to the artificial recruitment at the poor site of Birth-Aspen forest or cut some of the upper broadleaved trees on time in order to create a better condition under canopies.更多还原