转基因棉田节肢动物群落调查时间间隔的探讨

Research of Time Interval to Arthropod Community Investigation in Transgenic Cotton Field

为明确调查时间间隔对棉田生物群落多样性的影响,通过设置不同的时间间隔,调查转基因棉和常规棉2类棉田节肢动物群落,分析了不同时间间隔对棉田节肢动物群落个体总数、多样性指数、均匀性指数、优势集中性指数、物种丰富度的影响。结果表明,不同时间间隔对转基因棉和常规棉节肢动物群落调查结果的影响一致;变化最敏感的是个体总数和物种丰富度,均随时间间隔越长下降趋势越明显,而多样性指数、均匀性指数和优势集中性指数在不同的调查时间间隔没有显著的变化。鉴于近年来棉田出现较多的偶见种和稀有种昆虫,提出了客观、准确评价转基因棉田节肢动物群落的调查方法及下一步研究的重点。

In recent years, the effects of transgenic cotton to the ecosystem of cotton field were studied morly, but mostly studies were concentrated on evaluating transgenic cotton biology community safety by investigating insect community diversity in cotton fields. But the results were different because of the different methods and investigating time of investigation. To understanding the effects of different investigation time to biological diversity of communities in cotton field, we investigated the arthropod animal community in transgenic cotton and conventional cotton fields in different time intervals, and compared the results of arthropod an- imal population, diversity index, evenness index, dominant concentration, species richness by investigating at different time points in transgenic cotton field. The results showed that these indexes were influenced the same in transgenic cotton and conventional cotton at different time points. And the total number of individuals and species richness significantly decreased with increase of the time interval, but the diversity index, evenness index and dominant concentration had not obvious change among different time in- tervals. A lot of occasional species and rare species of insects appeared in cotton field in recent years, so we analyzed methods for objective and accurate evaluating the arthropod community in transgenic cotton field, and further study directions.