穆棱地区典型杨桦天然次生林资源状况的调查分析

Analysis of the Changing of Typical Poplar-birch Secondary Forest of Muling Area

通过对标准地的调查研究,对比分析了1987年到2012年穆棱林业局代马沟经营所典型杨桦天然次生林的生长变化情况。结果表明:25年间未采取任何经营措施的杨桦天然次生林在树种组成上变化明显;公顷株树有所下降,公顷蓄积有所增长,年均增长率为3.36%;林分径阶结构无明显变化,均为典型反J型分布。

In this paper, dates collected from sample stands of the year 1987 and 2012 at daimagou sector of muling forest- ry bureau were compared, the outcome show us ： changing of stand component to which none applications were applicated during the past 25 years was obvious ; the number of the tree per hectare declined, but the volume per hectare progressed, and the growth rate up to 3. 36%. Diameter structure of the stand get no changing.