《环境昆虫学报》

作者	单位
陶旋，陈亚平，鲁智慧，刘毅，孙仲享，和淑琪	云南农业大学植物保护学院，云南生物资源保护与利用国家重点实验室，昆明 650201

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中文摘要:

为明确大气CO2浓度升高对草地贪夜蛾Spodoptera frugiperda及其本地近缘种斜纹夜蛾Spodoptera litura生长发育和繁殖的影响。本研究在正常二氧化碳浓度(400 μL/L)和倍增二氧化碳浓度(800 μL/L)下，用寄主植物小麦饲养草地贪夜蛾和斜纹夜蛾，研究CO2浓度升高对草地贪夜蛾及斜纹夜蛾发育历期和繁殖力的直接影响(高CO2浓度直接影响试虫)、间接影响(高CO2浓度通过影响小麦间接影响试虫)及综合影响(小麦和试虫同时受高CO2浓度影响)。结果表明，CO2浓度升高对草地贪夜蛾各虫态的发育历期均有较显著影响，完成整个世代的时间显著缩短，其中间接影响组幼虫期较对照组显著延长0.7 d，而蛹期和成虫期寿命分别显著缩短1.5 d和4.9 d；综合影响组幼虫期较对照组显著延长0.8 d，而蛹期和成虫期寿命分别显著缩短1.2 d和5.7 d；直接影响组草地贪夜蛾蛹期显著缩短2.7 d；CO2浓度升高对斜纹夜蛾各虫态发育历期影响不显著，仅直接影响组的各虫态发育历期缩短较为明显。在CO2浓度升高条件下，草地贪夜蛾直接影响组单雌产卵量显著增加1 220.48粒，综合影响组略有减少；而斜纹夜蛾单雌产卵量在高CO2浓度下均呈现下降趋势，其中综合影响显著减少818.20粒。说明CO2浓度升高加快了草地贪夜蛾的种群增长速率，使其完成整个世代的时间显著降低；但对本地近缘种斜纹夜蛾的影响不显著。因此，在未来CO2浓度升高的情况下，入侵种草地贪夜蛾的种群增长速率将大于其本地近缘种斜纹夜蛾。

英文摘要:

In order to the effects of elevated atmospheric CO2 concentration on the growth, development and reproduction of Spodoptera frugiperda and its local relative Spodoptera litura. The study was performed at normal CO2 concentration (400 μL/L) and doubled carbon dioxide concentration (800 μL/L), the direct influence (elevated CO2 concentration directly affects the test insect)，indirect influence (elevated CO2 concentration indirectly affects the test insect) and comprehensive influence (wheat and test insect are affected by elevated CO2 concentration at the same time). The results showed that the increase of CO2 concentration had a significant effect on the development duration of all stages of S. frugiperda and the time to complete the whole generation was significantly shortened. The larval stage of the indirect influence group was significantly prolonged by 0.7 d compared with the control group, while the life span of the pupal stage and adult stage was significantly shortened by 1.5 d and 4.9 d, respectively; The larval stage of the comprehensive effect group was significantly prolonged by 0.8 d compared with the control group, while the life span of the pupal stage and adult stage was significantly shortened by 1.2 d and 5.7 d respectively; the pupa period of S. frugiperda in the directly affected group was shortened by 2.7 d; the increase of CO2 concentration had no significant effect on the development duration of each insect state of S. litura, but the development duration of each insect state of the directly affected group was significantly shortened. Under the condition of increasing CO2 concentration, the number of single female eggs of S. frugiperda increased by 1220.48 eggs respectively in the direct influence groups and decreased slightly in the comprehensive influence group; however, the number of eggs laid by a single female of S. litura showed a downward trend under elevated CO2 concentration and the comprehensive effect decreased by 818.20 eggs. It indicated that the increase of CO2 concentration accelerated the population growth rate of S. frugiperda and significantly reduced the time of completing the whole generation; but there was no significant effect on the local related species S.litura. Therefore, the population growth rate of the invasive species of S. frugiperda will be higher than that of its local relative species S. litura, under the condition of increasing CO2 concentration in the future.

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