Effects of different types of steppe fencings on insect diversity
To explore the influence of fencing and enclosure in different types of grasslands on insect di-versity. During the spring,summer,and autumn of 2023,systematic monitoring of herbivorous and pred-atory insects was carried out using the pitfall trapping method in three steppe types:temperate desert steppe,the transition zone between desert and temperate steppe,and temperate steppe,located in and around Yanchi County,Ningxia Hui Autonomous Region. The differences in insect diversity between the enclosed and unenclosed areas were analyzed,and the correlation between the vegetation communi-ty characteristics and insect communities was also examined. The results showed that a total of 1 309 herbivorous and 2 390 predaceous insects were collected in the three types of steppes in 2023,amount-ing to a total of 3 699 insects belonging to 49 species of herbivorous insects and 30 species of preda-ceous insects. In the temperate desert steppe,the species richness,individual numbers,and diversity in-dices of insects were all lower in the enclosed area than in the external area. However,in both the transi-tion zone and the temperate steppe,insect diversity indices were higher in the enclosed area,while dom-inance indices were lower. Furthermore,significant differences were observed in the abundance of pred-atory and herbivorous insects between enclosed and unenclosed areas across various seasons within the three types of steppes. In addition,herbivorous insect species richness,individual numbers,diversity,and evenness indices of herbivorous insects were negatively correlated with plant height,while the indi-vidual number was positively correlated with plant frequency and aboveground biomass,and the diversi-ty and evenness indices were also positively correlated with plant density. In the enclosed area,as the number of predaceous insects increased,the individual number of herbivorous insects also increased,and there was a significant positive correlation between them. Therefore,implementing fencing and protec-tion measures in the transition zone between desert and temperate steppe and in the temperate steppe can effectively increase insect diversity in the ecosystem and reduce the risk of pest outbreaks.
万方数据
维普
