我国中幼龄林资源特点及抚育潜力分析

Analyses on Young-and-Middle Aged Forests Characteristics and the Tending Potential in China

以我国中幼龄林资源为对象,分析其特点,在此基础上探讨森林抚育经营的潜力。研究认为,我国森林抚育经营的潜力巨大,中幼龄林可抚育面积5 461.8万hm2,占全国中幼龄林面积的52%;其中郁闭度在0.2～0.4的过疏林分占47%,郁闭度在0.8以上的过密林分占44%,遭受自然灾害或发生病虫害较严重的中幼龄林占9%。按可抚育林分目前的单位面积蓄积量49.82 m3/hm2计,现实生产力占生产潜力的42%,则全国可抚育的采伐蓄积达到2.72亿m3,将增加森林蓄积75亿m3。

The potential for tending and management of the young-and-middle-aged forest resources was studied on the basis of analyzing the characteristics of young and middle aged forest resources in China. The results showed that there was a great potential of forest tending and management, because there was 54 618 000 hm2 young and middle aged forests and plantations to be tended in China, which accounted for 52% of the total young and middle aged forest resources in the country. Among which 47% was with 0. 2 - 0. 4 crown density, 44% was with 0. 8 crown density, and 9% was suffered from varied natural disasters and severe insect pests. Taking 49.82 m3/hm2 as the average standing crop per unit area of the forests to be tendered, the current productivity was only 42% of the potential productivity, the nationwide timber reserves from tending would amount to 2.72 billion m3 , and the stand- ing crop of forest resource in China would be increased by 7.5 billion m3.