论文部分内容阅读
一、树木感染病虫害的原因林木病虫害的发生由多种原因引起的。首先,绥中县人工林的不断扩大,栽种的树种单一,林木的结构分布不合理,影响了森林中生物链的形成,从而导致病虫害的发生。其次,自从我国加入WTO以后,与各国之间的经济贸易联系广泛,在经济贸易的相互交易过程中,新型病虫通过运输的介质入侵,同时对这种新型病虫我们又缺乏了解,从而导致病虫害猖獗,再次,近年来全球气候的变暖,适宜的湿度利于害虫的生长和繁殖,
First, the reasons for pests and diseases of trees Forest pests and diseases caused by a variety of reasons. First of all, the continuous expansion of plantation in Suizhong County, planting a single tree species, the distribution of trees is not reasonable, affecting the formation of biological chains in the forest, leading to the occurrence of pests and diseases. Second, since China’s accession to the WTO, economic and trade ties with other countries have been extensive. In the process of mutual trade and economic cooperation, new pests and diseases have invaded through the transport medium, and we have also lost a good understanding of this new pest and disease disease. As a result, Pests and diseases rampant, again, in recent years the global climate warming, suitable humidity conducive to the growth and reproduction of pests,