广元市松褐天牛危害情况调查

松褐天牛分布十分广泛,采用标准地调查法和查迹法,开展了广元市松褐天牛危害情况、海拔高度、林分组成等全域指标调查和危害程度评价。结果表明:(1)该区域松褐天牛的危害与树种关系密切,其危害以马尾松、油松和华山松为主;(2)松材线虫分布与林分结构、海拔及林分因子密切相关,与人为因素也有一定关系;(3)松褐天牛危害程度在该区域为中度及以下,个别区域达到严重危害程度,应当采取相应措施予以防控。

Hazard Investigation of Monochamus alternatus in Guangyuan City

Monochamus alternatus is widely distributed.Standard investigation and trace investigation methods were used to investigated the damage situation of Monochamus alternatus in Guangyuan city.Altitude,forest composition and other related indicators were surveyed simultaneously.The danger degree of Monochamus alternatus was evaluated.The results showed that:(1)The damage degree of Monochamus alternatus in this area was closely related to tree species.The host tree species were mainly Pinus massoniana Lamb.,Pinus tabuliformis Carrière and Pinus armandi;(2)The distribution of Bursaphelen-chus xylophilus was closely related to stand structure,altitude and stand factors,as well as human factors;(3)The damage degree of Monochamus alternatus in Guangyuan was moderate or lower in this area,and some areas was seriously damaged,and corresponding measures should be taken to prevent and control it.