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次生林的林分改造问题是当前我国营林工作和林业科学研究的新内容之一。我省的次生林约占全省林地总面积的1/3,其中主要是赤松林。我们根据近几年来调查和试验的结果,提出初步意见,以供进一步开展林分改造工作的参考。一山东赤松天然次生林的概述山东赤松天然次生林,主要分布在烟台专区,昌潍专区东北部和东南部及临沂专区东部的广大低山和丘陵地区。在地势偏僻的地方,多集中成片,林相整齐;在交通运输便利的地方,多为零星分布。赤松林的垂直分布是从海拔50米起到海拔850米止,但以海拔600米以下的地段生长较好。
The problem of secondary forest transformation is one of the new contents of forest management and forestry research in our country. The secondary forest in our province accounts for about 1/3 of the total area of the province’s forest land, mainly the red pine forest. Based on the results of the surveys and experiments conducted in recent years, we put forward preliminary opinions for reference for further carrying out the reforestation work. An overview of natural secondary forests in Japan Pinus densiflora Natural secondary forests in Japan, mainly distributed in Yantai Prefecture, Changwei area northeast and southeast and Linyi area east of the vast low mountains and hilly areas. In remote areas, more concentrated into films, forest phase neatly; in the convenient transportation, mostly sporadic distribution. The vertical distribution of red pine is from 50 meters above sea level to an elevation of 850 meters only, but to an elevation of 600 meters below the better growth.