论文部分内容阅读
我省现有17个森工企业,建局20年以上的老局有13个,由于开发历史久,致使原始森林资源日趋减少,生产条件越来越差。因此,我省森工企业的森林资源能否永续利用,已成为人们普遍关心的问题。根据1980年林业资源连续清查第一次复查资料,试对我省森工企业森林资源问题作下述探讨: 由上表看出,五年来森工企业有林地面积减少了21.47万公顷,疏林地面积增加12.37万公顷,非林地面积增加了3.59万公顷,采伐迹地面积增加1.79万公顷,森工企业的森林复被率五年来减少了5.9％。根据复查地区1660块复位固定样地材料分析,有林地变为其它地类,其中采伐占63.6％,乱伐占21.2％,毁林开荒占9.1％,自然枯死占3.0％,调
There are currently 17 forest industry enterprises in our province. There are 13 old councils with more than 20 years of built-in bureau. As a result of a long history of development, the original forest resources have been declining and the production conditions have become worse and worse. Therefore, forestry enterprises in our province forest resources sustainable use, has become a common concern. According to the first review data of continuous inventory of forestry resources in 1980, the following discussion is made on the forest resources of forestry enterprises in our province: From the table above, the forest industrial area of forest enterprises decreased by 214,700 hectares over the past five years. An increase of 123,700 hectares in area, an increase of 35,900 hectares in non-woodland area and an increase of 17,900 hectares in deforestation area, and a 5.9% reduction in the forest cover rate of forest industry enterprises in five years. According to the analysis of 1660 reset fixed sample plots in the area under review, some of the forest land has been converted into other types of land, of which 63.6% are felling, 21.2% are deforestation, 9.1% are deforested and 3.0% are natural fecundity