Abstract:

In order to understand the insect community structure during the growth period of rice in the field and explore its occurrence rule and damage characteristics, the insect community under the monitoring lamp was investigated in the rice field of Jiande City, Zhejiang Province from 2014 to 2023. In this study, the natural composition, dominant species, functional composition of the insect community and comparison of insect communities at different time were analyzed. The data showed that the insect community under the monitoring lamp in the rice field consisted of 14 orders and 81 species, among which Lepidoptera had the largest number, accounting for 30.86%, followed by Homoptera and Coleoptera, accounting for 17.28% and 14.81%, respectively. According to the nutrient level, the insect community can be divided into four functional groups, in which the phytophagous insects occupy the dominant position, with the number of species accounting for 72.83% and the number of individuals accounting for 32.79%. Among the phytophagous insects, the main pests that pose a threat to rice accounted for 48.14% of the total species, and these pests are numerous and large in number, causing the most serious damage to the rice field. The top 7 dominant insects in the community were Anopheles sp., Sogatella furcifera, Lasius niger, Stenchaetothrips, Colaphellus bowringi, Chilo suppressalis and Nilaparvate lugens, which accounted for 78.77% of the total number of the community and played a decisive role in the community structure and community environment. According to the time division, the diversity and evenness of insect community in rice field showed a decreasing trend year by year, but the diversity and evenness of insect community in rice field increased abnormally in 2020-2021, and the diversity index (H') and evenness (J) were the largest in 10 years.

Key words: rice field, insect, community structure, monitoring lamp