论文部分内容阅读
以吉林省三岔子林业局的森林资源为调查对象,针对限额采伐后近13 a的资源数据和森林资源变化状况进行分析,结果表明:实施限额采伐后,年采伐量与实施天保工程初期相比较下降了38.32%;森林覆盖率提高了2.04个百分点。幼龄林面积、蓄积比例分别下降了9.3和2.5个百分点;中龄林面积、蓄积比例分别增加了3.4和1.9个百分点;近熟林面积、蓄积比例分别增加了2.9和0.3个百分点;成熟林面积比例增加了1.5个百分点,蓄积比例下降了1.0个百分点;过熟林面积、蓄积比例分别增加了1.8和1.3个百分点。
Taking the forest resources of Sanchazi Forestry Bureau of Jilin Province as an example, the author analyzed the resource data and the changes of forest resources in the past 13 years after the quota harvesting. The results showed that after the quota harvesting was carried out, the annual harvesting volume was compared with the initial implementation of the natural forest protection project A decrease of 38.32%; forest coverage increased by 2.04 percentage points. Young forest area and stock ratio decreased by 9.3 and 2.5 percentage points respectively; middle-aged forest area and stock proportion increased by 3.4 and 1.9 percentage points respectively; near-mature forest area and stock proportion increased by 2.9 and 0.3 percentage points respectively; mature forest Area ratio increased by 1.5 percentage points, the proportion of accumulation decreased by 1.0 percentage point; over-mature forest area, the proportion of accumulation increased by 1.8 and 1.3 percentage points.