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天然次生林是国家的后备资源,是我省实现森林资源永续利用的重要后备资源,本林区由于开发较晚成过熟林资源较多,对天然次生林的经营尚未引起足够的重视。本文仅就如何经营好天然次生林,使其速生丰产提出一点粗浅的看法:本林区现有天然次生林是建国后经过封山育林,在原采伐迹地上形成(以杨桦为主要树种)的一代更新层。面积达19万公顷占全局总面积的31%;总蓄积量2000多万立方米,占全局活立木总蓄积量的30%;年平均纯生长率为1.85%(山杨2.41%、椴树1.1%、柞树1.52%、硬阔叶混交林1.28%、软阔叶混交林1.64%)。
The natural secondary forest is a reserve resource of the country and an important backup resource for the sustainable utilization of forest resources in our province. Due to the development of more mature mature secondary forest resources, there are not enough attention paid to the operation of the natural secondary forest. This paper only gives a little superficial opinion on how to manage natural secondary forests and make them fast-growing and high-yielding. The present natural secondary forest in this area is a generation renewal layer formed after the closing hillsides afforestation and afforestation on the original logging sites. Covering an area of 190,000 hectares accounting for 31% of the total area of the total; the total volume of more than 20 million cubic meters, accounting for 30% of the total volume of live standing wood; the annual average net growth rate of 1.85% (Aspen 2.41% 1.52% for oak tree, 1.28% for hard and broad-leaved mixed forest, and 1.64% for soft and broad-leaved mixed forest).