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摘要
To rapidly estimate pine sawyer, Monochamus alternatusHope, population densities in forests, the vertical distributions of M.alternatus oviposition sites and larvae on infested Masson pines (Pinus massonianaLamb.) were studied. Results showed that the number of oviposition sites on sections of trunks between 0 and 2m above ground was significantly greater than on sections of trunk above 2m, and the vertical distribution had a significant logarithmic relationship with trunk height. The larval number of M.alternatus on dead infested trees had a significant difference among heights of trunks. Sections on trunks at 2-4m usually contained the largest number of M.alternatus larvae, while the number of larvae on trunks above 10m declined significantly, as well as in the 1m section of trunk at the base. The vertical distribution of M.alternatus larvae on dead infested pines showed a distinct parabolic relationship with trunk height. The number of oviposition sites of M.alternatus on infested Masson pine trunks revealed a significant exponential relationship with the diameter at breast height (DBH) of trees. A significant positive linear relationship also was observed between M.alternatus larval number and DBH on the host pine trees, as well as between the numbers of larvae and oviposition sites on an individual tree. The total number of larvae in an infested tree could be calculated easily using an established equation, through counting the number of oviposition sites at 3-4m of trunk aboveground. This study developed a practical method for rapid estimation of M.alternatus populations.
- 出版日期2016-3
- 单位中国林业科学研究院森林生态环境与保护研究所
