论文部分内容阅读
桃山林业局于1960年建局,但采伐历史已有四十年之久,早在日伪时期就开始了掠夺式的采伐至今已经多次回头采。解放后至建局以来开发的森林,由于历史采伐量大于生长量(平均年伐量为50万m~3,最高年代量近70万m~3,年生长量仅25万m~3,森林资源日趋减少桃山林业局总面积为178,440公顷,现已减少到101,880公顷,总蓄积由16,881,000m~3下降到14,490,400m~3。针叶比重由37%变为12%。其原因主要是重采轻造,采育失调。一、因林因地制宜,选定合理采伐方式
Peach Hill Forestry Bureau in 1960, the establishment of the Council, but the logging history has been 40 years, as early as the Japanese and pseudo-era began predatory logging has repeatedly been mining. Since the liberation, the forest developed since the establishment of the URA has a history of logging more than the amount of growth (the average annual cut is 500,000 m 3, the highest generation is nearly 700,000 m 3, the annual growth is only 250,000 m 3, and the forest Reducing Resources Peach Hill Forestry Bureau covers a total area of 178,440 hectares, has been reduced to 101,880 hectares, the total volume decreased from 16,881,000m ~ 3 to 14,490,400m ~ 3. Coniferous proportion changed from 37% to 12% .The reason is mainly re-mining Light, miscarried picks I. First, due to local conditions, select a reasonable way of harvesting