Diversity Of Insect Community In Chinese Pine Forest From Badaling Forest Center In Beijing

Due to be lack of cognize to insect community,it was difficult to find the key factor for controlling pest,and caused the short of the scienfitic to operation management.So it was important to study the structure of insect community. In this paper, In this paper,the insect community in Chinese pine forest was studied.It could be provided evaluating mode for insect communities in other forest types from Beijing.The results were:(1) All-year insect community in Chinese pine forest included 12 orders, 51 families, 85 species. The amount of Lepidoptera was 10 families and was the most, the number of Coleoptera was 15 species and was the most.The various grouds number of Phytophagous was the most (66.89%),the second was Spider (25.45%) , Predatory and Parasitic (6.32%),the Neutral insect was lest (1.33%).(2)The insect species number of Chinese Pine was the most in July,and in September was the lest.The amount of insect species was the most of arbor layer, bush and field layer in July,the insect species number of arbor layer was the lest in September and in bush and field layer was the lest in April.(3) The change trend of insect community in arbor layer similar to that of insect community in Chinese pine forest. This show that insect community in arbor layer is the main impact factor of the change trend of insect community in Chinese pine forest.(4) The trend of Chinese pine insect community Niche breadth was upward in April-July,and downward in July-September,the Niche was the spreadest in July (0.78),which was the activitiest time in all classes of insect.(5)The insect pests and their natural enemies closely related and assumed extremely significant (P<0.01), there was obvious follow effect for insect pests to their natural enemies,so insect pests preferably controlled their natural enemies.From the change of trophic structure,the insect community compose was rational.But from the complexity of trophic structure,the food chain was too singleness.it was easy to get affection from outside,and the possibility of pest outbreak increased.(6)In natural enemies, the Niche breadth of Spider was always spreadest,and with Cinara pinitabulae formis Niche overlap was the most,also appeared in April-September,it showed that Spider was the Cinara pinitabulae formis the most important natural enemies.