CO2升高下入侵种西花蓟马与本地蓟马的种群响应及其竞争机制研究

CO2浓度的持续升高影响着农林生态系统及农林害虫。CO2升高下入侵物种与本地种间的竞争演替成为生态学、昆虫学领域的研究热点。前期发现三种蓟马在栀子花上的优势度为黄胸蓟马＞西花蓟马≥花蓟马，其对CO2升高具有不同响应。因此，本项目以重大危险性入侵种西花蓟马与不同优势度的本地种黄胸蓟马、花蓟马为研究对象，结合贵州特殊的喀斯特环境，以栀子花为寄主，利用人工模拟CO2升高，采用种群生命表、生理生化测定、个体/种群行为分析等研究手段，多角度系统比较和分析CO2渐增条件下西花蓟马与不同优势度的本地种的种间抑制与竞争取代、种群消长、连续多个世代潜在种群增长趋势及其跨世代效应、个体生长、繁殖、体内能源物质含量、生理酶活性和种群遗传变化等，以期阐明入侵种与本地种对CO2升高不同的适应机制，揭示CO2升高下入侵害虫的种群扩张及与本地种的竞争取代等机制，为气候变化下蓟马类害虫的重点防治提供科学依据和实践指导。

The continuous rise of CO2 concentration is causing serious impacts on agroforestry system and profoundly threatening and changing the population composition and diversity of agricultural and forest pests. Therefore, the competition and succession between invasive species and local species in the context of rising CO2 concentration have become the highlights of research in the fields of ecology and entomology. Early research finds that three thrips are sorted as follows in terms of their dominance on Gardenia jasminoides: Thrips hawaiiensis ＞ Frankliniella occidentalis ≥ F. intonsa and the rise of CO2 concentration can facilitate the population growth of invasive thrips but do harm to local thrips. Thus, this project studies F. occidentalis , a major hazardous invasive species, as well as T. hawaiiensis and F. intonsa , local species with different dominance. In combination with the special Karst environment of Guizhou, G. jasminoides were adopted as hosts and the rise of CO2 concentration was simulated by manual. Population life table, physiological and biochemical determination, individual/population behavior analysis and other research means were adopted in this paper. Under the increase of CO2 concentration, this paper systematically compares and analyzes from multiple perspectives the inhibition and competitive replacement of F. occidentalis and local species, population growth and decline, potential population growth index for multiple consecutive generations and their cross-generation effect, individual growth, reproduction, content of energy substance in their bodies, physiological enzyme and changes in population heredity, etc. This paper hopes to illustrate the different mechanisms of the adaptation of invasive and local species to the rise of CO2 concentration from the perspectives of physiology, individual metabolism and population, interpret the population growth of invasive pests under the increase of CO2 concentration and the population succession under the interactions with local species having different dominance and other mechanisms, and also provide scientific basis and practical guidance for the key prevention and control of thrip pests in the changing climate.