华山松是四川东部地区海拔1300—2000米中山地带的主要速生、优质的用材树种。近几年,华山松林区相继发生大片落针拈死,其面积之大,范围之广,危害之严重,实为全国所罕见。这一森林生态性灾害,不仅对林业建没和生态效益造成不可估计的损失,而且极大地挫伤了广大群众植树造林的积极性,同时也给林区职工生活带来许多困难。因而,普遍引起社会各界和林业部门的关注和重视。 1984年6月,万县地区林业局曾组织调查,提出紧急报告,要求查明枯死原因。同年11月,中国林学会组织了中国料学院等单位,对奉节县茅草坝林场进行考察(一天),认为大气污染促行病虫害盛发,导致林木成片枯死。华山松林区大面积枯死是我省(包括鄂、陕等 Huashan pine is the main fast-growing, high-quality timber species in the Zhongshan area of ​​1300-2000 meters above sea level in eastern Sichuan. In recent years, large areas of Huashan pine forest have been hitched with lots of dead needles. The area is large, the scope is wide and the damage is so serious that it is rare in the whole country. This forest ecological disasters not only caused unpredictable losses to the construction of forestry and ecological benefits, but also greatly dampened the enthusiasm of the masses for tree planting and afforestation. At the same time, it also brought many difficulties to the lives of forest workers. Therefore, it has aroused the attention of all sectors of society and the forestry sector. In June 1984, the Wan County Regional Forestry Bureau organized an investigation and put forward an urgent report asking for the identification of the cause of death. In November of the same year, the Chinese Academy of Forestry organized a consortium such as China Materials Institute to conduct an inspection (one day) on the Miaochangba forest farm in Fengjie County. It is thought that air pollution promotes the vigorous development of pests and diseases, resulting in dead trees. Huashan pine forest area is dead in large areas in our province (including Hubei, Shaanxi and so on