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南岔林业局经营总面积299 716公顷,40年来采伐1445万m~3木材,迹地更新11.4万公顷,森林覆被率70%。由于天然林的过量采伐,人工林尚未能恢复和补偿完善生态环境,处于森林生态系统中的食物链和鼠类天敌急剧减少。由于鼠类适应性强、食性广、繁殖力高,导致种群数量增加,使生境单纯的人工林,尤其是幼林经常遭受鼠害。为此,自1974年以来,于每年春季(4月)和秋季(9月),对常见林业害鼠活动情况及其栖息环境用夹日线法进行鼠情调查,探索消长规律;并根据立地条件、林分特点、害鼠种类及危害情况,因林制宜进行综合防制,使人工幼林的鼠害基本得到控制。
Namcha Forestry Bureau operates a total area of 299,716 hectares and harvested 14.45 million m 3 of wood in 40 years, covering an area of 114,000 hectares and a forest cover rate of 70%. Owing to over-harvesting of natural forests, plantation forests have not yet been able to recover and compensate for the improved ecological environment, and the food chain and rodent natural enemies in forest ecosystems have drastically declined. Due to the strong adaptability of rodents, wide feeding habits and high fertility, the population increase, which makes the habitats of pure plantations, especially young forests often suffer from rodents. To this end, since 1974, Spring Festival (April) and autumn (September) each year, common forestry rat activity and habitat environment using sandwich daily survey of rodents to explore the law of growth and decline; and according to the site Conditions, stand characteristics, types and damage of rats, due to forest should be integrated prevention and control, so that the basic control of rodent pests young plantation.