Population characteristics ofDendrolims superans in Daxing’an Mountains |
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Authors: | Meng Qingfan Yang Xiaoguang Yan Luguang Hong Guoqi Lin Long Liu Kuanyu |
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Institution: | (1) Northeast Forestry University, 150040 Harbin, P.R. China;(2) Shibazhang Forestry Buream, 150040 Harbin, P.R. China;(3) Hanjiayuanzi Forestry Bureau of Daxing’an Mountains, 150040 Harbin, P.R. China;(4) Jiagedaji Forestry Bureau, 150040 Harbin, P.R. China;(5) Northeast Forestry University, 150040 Harbin, P.R. China |
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Abstract: | Dendrolims superans produced one generation every two years. Large larvae and small larvae exist at the same time. It broke out in Daxiang an
Mountains in 1990, and seriously destroyed growth ofLarix gmelini Rupr. In order to controlD superans, the population properties ofD superans were studied from 1991 to 1992, including sexratio, age distribution, pattern etc.. The sex ratio ofD. superans population is ♀∶♂ − 1.06:L. The larvae age distribution indicates that larvae over 5 instar is less than younger larvae under
4 instar in Yongqing forest farm, but the younger larvae under 4 instar is more than larvae over 5 instar in Hanjiayuanzi
Forest Farm. The population ofD. superans in Yongqing Farm has been declining. and mereasing in Hanjiayuanzi. Pupae and eggs are mainly distributed in middle and lower
crowns layer of trees respeetively account for 66% and 59.5% of total individuals. The pupae in higher crown layer is lightly
regular distribution and clumping distribution middle and lower crowns layer of trees. The eggs in higher crown is light clumping
distribution and random in middle and low crown of tree.
(Responsible Editor: Zhu Hong) |
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Keywords: | Dendrolims superans Daxing’ an Mountains Population Characteristics Special pattern |
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