近日，中科院动物所农业虫害鼠害综合治理研究国家重点实验室的戈峰研究组通过在自行组装的开顶式大气CO2浓度控制室，模拟未来大气CO2浓度加倍（750PPM）下，探讨了春小麦－棉铃虫及其寄生性天敌中红侧沟茧蜂系统对大气CO2浓度升高的响应。
通过用高CO2浓度处理下生长的小麦连续两代喂饲棉铃虫，然后在棉铃虫幼虫低龄时接入它的寄生性天敌——中红侧沟茧蜂，连续两代测定它们的种群参数和取食和寄生能力。研究结果表明，在CO2浓度升高下，寄主作物春小麦营养水平下降，导致棉铃虫生长发育延长，但并没有改变棉铃虫对于春小麦的取食量，而中红侧沟茧蜂对于棉铃虫的寄生率也没有发生显著性的变化。该研究首次从寄主植物-害虫-天敌三级营养关系角度，定量分析CO2浓度升高对害虫-天敌取食与寄生关系，结果清楚地显示，在未来CO2浓度升高下，不会改变棉铃虫与其天敌中红侧沟茧蜂的种间关系，CO2浓度升高不会明显增加棉铃虫的危害取食和中红侧沟茧蜂的寄生作用。相关成果发表在最近出版的Agriculture, Ecosystems and Environment杂志上。
由于工业的快速发展，消耗的化石燃料急剧增加（煤、石油、天然气），CO2被大量排放；同时，森林砍伐和土地利用等的改变使得被植物吸收利用CO2的量减少，从而导致CO2被消耗的速度降低。据IPCC（2007)报道，工业化革命前大气CO2浓度为280μl/L，而到了2005年已上升到379μl/L，预计到本世纪（21世纪）末，大气CO2浓度将在现有的基础上加倍，增加到700μl/L左右。国内外学者一直非常关注大气CO2浓度升高对于人类赖以生存的农业生态系统所产生的影响，动物所该项研究对此作了有益的补充。（生物谷Bioon.com）
生物谷推荐原始出处：
Agriculture, Ecosystems & Environment, Volume 132, Issues 3-4, August 2009, Pages 267-275
No effects of elevated CO2 on the population relationship between cotton bollworm, Helicoverpa armigera Hübner (Lepidoptera: Noctuidae), and its parasitoid, Microplitis mediator Haliday (Hymenoptera: Braconidae)
Jin Yin, Yucheng Sun, Gang Wu, Megha N. Parajulee, Feng Ge
Estimating the population consumption of an insect population under elevated CO2 is an important step in understanding the effects of elevated CO2 on herbivore–crop interactions. Two successive generations of cotton bollworm, Helicoverpa armigera Hübner, were reared on milky grains of spring wheat (Triticum aestivum L.) grown in open-top chambers under increased carbon dioxide (CO2) concentration. H. armigera development, wheat consumption, and parasitism by Microplitis mediator Haliday were examined, as were the effects of elevated CO2 on the wheat itself. We experimentally tested the hypotheses that, by quantifying the population consumption of H. armigera, elevated CO2 enhanced the pest-control ability of M. mediator again H. armigera. Decreases in protein, total amino acid, and nitrogen (N) content were noted in spring wheat when grown in an elevated-CO2 environment, as were increases in total non-structure carbohydrates (TNCs) and in the ratio of TNC to N. In the first generation of H. armigera reared under elevated CO2, no significant changes were observed in population generation time (T) or in the intrinsic rate of increase (rm) between CO2 treatments. However, in the second treatment generation, longer generation time resulted in a lower rm value. Elevated-CO2 levels caused no significant changes in the H. armigera population's total wheat consumption. The rates of parasitism, cocooning, and emergence by M. mediator were also unaffected, as were its average weight and adult lifespan. As no significant changes in wheat consumption by H. armigera or in the parasitic rate of M. mediator were revealed, the results indicate that the population relationship between H. armigera and M. mediator is unlikely to vary due to future elevated atmospheric CO2 concentrations.
