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在可更新的自然生物资源中,森林的寿命最长,异龄性也最大,给经营管理和调整带来复杂性。由于地域辽阔,森林的年龄结构和树种组成难以直接调整。唯有通过林业措施(如主伐、抚育伐、造林和林分改造),系统评价和监察其变化能多少成功地起些作用。查明和评价由于森林自身的自然过程和营林活动引起的变化应成为森林经理组织规划设计和指导林业生产的基础。
Among renewable natural resources, forests have the longest life expectancy and the largest age-associated diseases, which bring complexity to management and adjustment. Due to the vast territory, the age structure and species composition of the forest can not be directly adjusted. Only through forestry measures such as cutting, tending, reforestation and reforestation, can systematic reviews and monitoring of how much change have succeeded in making a difference. Identification and evaluation of changes due to the natural processes and forestry activities of the forest should be the basis for the forest managers to plan and design forestry and guide forestry production.