我国西北部地区森林生物灾害发生趋势分析及可持续控灾策略

针对陕西、甘肃、内蒙古、青海、宁夏和新疆西北6省(区)目前的森林现状,分析了两北部地区森林生物灾害的发生特点:主要是(1)森林病虫鼠害严重,尤其是害鼠种类多、分布范围广,危害严重。(2)钻蛀性害虫发生隐蔽,控制困难。(3)干旱和生物多样性贫乏使食叶害虫的暴发周期缩短。预测未来10年森林生物灾害的发展趋势为:(1)总体发生趋势平稳;(2)病虫种类将明显增加;(3)森林鼠害面积明显增加,危害程度在一定时期内会更加严重;(4)杨树蛀干害虫的危害仍然严重。进而提出了可持续控灾的5点策略。

Prediction of Occurrence of Forest Bio-Disaster in Northwest Area of China and its Sustainable Control Strategies

Based on the present forest condition in Shanxi, Gansu, Inner Mongolia, Qinghai, Ningxia and Xinjiang (6 provinces and autonomous regions) , the paper analyzed the occurrence of forest disaster caused by bioagent (bio-disaster) in these regions, the characteristics of which are as follows; (1) Forest diseases of insect and rodent pests are very serious with many species of rodent, which distributed widely and caused very serious damage in these regions; (2) It is difficult to find and control tree borers; (3) The occurrence interval of defoliators is shortened by drought and there is a lack of biodiversity in these regions. The occurrence trend of forest bio-disaster in the next 10 years is predicted; (1) The total occurrence trend will be steady; (2) The number of pest species will obviously increase; (3) The damaged area caused by forest rodents will obviously increase, and the damage will be more serious; (4) Damage caused by tree borers will be still serious. The five sustainable control strategics for forest bio-disaster was put forward in the paper.