松墨天牛幼虫生息坑道的研究

The Study of Living and Inhabiting Tunnel of Monochamus alternatus

松墨天牛幼虫在松树内钻筑的生息坑道对其生存和繁殖具重要意义。研究显示:松墨天牛幼虫坑道数量分布与不同松树高度、胸径、株内高度、树干皮层厚度有着密切关系。幼虫坑道数量比率随不同松树高度、胸径的增加而增高,与株内不同高度区域的材积大小无关。平均树高4～6m和8～9m的马尾松,幼虫坑道分布率以树高2～3m和3～4m处为最高。马尾松和黄山松寄主上,幼虫坑道分布率分别以1 1～2 0mm和3 1～4 0mm厚的皮层为最大。为阻止同类幼虫侵入坑道,幼虫以啮木发出警示声,平均每次持续2min35s。

It is highly important for the life and reproduction of Monochamus alternatus larvae to bore and build the living and inhabiting tunnel.The research results showed that:there was close relationship between the quantity distribution of Monochamus alternatus larvae tennel and different pine tree height,DBH,region height in tree and the trunk bark thickness.The larval tunnel quantitative ratio increase with the pine tree height and DBH increased,but it was no correlated with the volume of different height region in tree.Most tunnels distributed in the height of 2～3 m and 3～4 m for the trees heighted 4～9 m in anerage.The bark thickness of 1.1～2.0 mm and 3.1～4.0 mm were the highest distribution zone of the larval tunnel distribution ratio in Pinus massomiana and P.taiwanensis host tree.The larvae gave out to gnaw wood warning sound,mean 2 min 35 s/time,for prevent same species larvae intrude into the tunnel.