铁桥林场森林资源平衡率分析及预测

Analysis and forecast for the balance rate of forest resources in Tieqiao Forest Farm, Shanxi Province.

该文通过对山西省太行森林经营局铁桥林场林业用地各龄级面积和立木蓄积的调查 ,应用“平衡率”数量指标和“面积、蓄积最优化”指标对森林资源的平衡率、蓄积分布、树种结构及人工林与天然次生林比重等作了初步分析 ;提出调整森林资源结构、加强对次生林的抚育改造、综合利用发展绿色经济 ;并对今后 2 0a的树种结构、面积分布、立木蓄积和次生林改造情况作了预测分析 .预测表明 ,到 2 0 19年该场人工林将由原来的 6 45 .7hm2 增加到2 76 0 2hm2 ,森林资源平衡率由原来的 0 5 6提高到 0 73 ;优势树种落叶松和油松的平衡率分别提高了 0 2和0 0 3;落叶松面积比重由 0 3%提高到 31 2 % ;油松面积比重由 93%降为 6 2 .7% ,主要树种的比例得到了调整 。

Through investigation on the forest area and growing stock of various age classes in Tieqiao Forest Farm of Taihang Forestry Bureau in Shanxi Province, the paper makes preliminary analysis on the balance rate of forest resources by applying the “balance rate 'indexes. Distribution of growing stock, structure of species, proportion of plantation and natural secondary forests are studied with the \!optimum structure of forest area and stock' indexes. Therefore, some useful suggestions are put forward for the Tieqiao Forest Farm to optimize the forest resource structure, reinforce reproduction of secondary forest and develop green economy. And in the last, the distribution of area and growing stock of forest resources and the transform of secondary forest are analyzed and forecasted for the coming 20 years. As forecasted, by 2019 the area of Tieqiao Forest Farm plantation will be increased from 645.7 hm\+2 to 2 760.2 hm\+2. At the same time, the balance rate of forest resources will be increased from 0.56 to 0.73. The balance rate of dominant species ——larch \%(Larix principis\|rupprechtii\%) and Chinese pine (\%Pinus tabulaeformis)\% will be increased by \{0.2\} and 0.03.The area ratio of larch will be increased from 0.3% to 31.2%. On the contrary, the area ratio of Chinese pine will be decreased from 93% to 62.7%. By using these methods, the ratio of main species will be adjusted and the area of various age classes will tend to balance.