4种不同类型棉田昆虫群落结构的比较

Studies on the structure and compositon of insect community in the four different cotton fields

在田间小区研究了转双价基因棉(中棉所41号)对昆虫群落结构与组成的影响。结果表明,转双价 基因棉田昆虫群落的结构与转Bt基因棉田和常规棉田无明显差异,但与常规棉常规施药田差异显著;转双价基因 棉田昆虫群落的物种数(50种)与常规棉田(50种)和转Bt基因棉田(53种)无明显差异,但均明显高于常规棉常规 施药田(44种);转双价基因棉田昆虫群落的个体总数和相对丰盛度与其他棉田无明显差异;转双价基因棉和转Bt 基因棉对昆虫群落物种数的时空动态无明显影响,而常规药物防治对棉田物种数的时空动态分布影响较大;棉铃 虫已不是转双价基因棉田和转Bt基因棉田的优势害虫,但仍然是常规棉田和常规棉常规施药田的优势害虫。

The effects of transgenic CrylAc plus CpTI cotton（CRI41） on the structure and composition of insect community were studied in cotton plots. Results showed that the differences of structure of the insect community were not very clear between the transgenic CrylAc plus CpTI cotton field, transgenic CrylAc cotton field and the traditional cotton field,but the difference was＇very clear between the transgenic CrylAc plus CpTI cotton field and traditional cotton field with pests controlled. The differences of species number of insect community were not very clear between the transgenic CrylAc plus CpTI cotton field（50） ,transgenic CrylAc cotton field（53） and the traditional cotton field（50） ,but species number of insect community in these three cotton fields were all higher than that of the traditional cotton field with pests controlled（44）. Compared with others,total numbers of insect community in transgenic CrylAc plus CpTI cotton showed no difference,and the richness of insect in the cotton field was higher than that of the other cotton fields,but the richness of nature enemy was lower ~The effects of the transgenic CrylAc plus CpTI cotton and transgenic CrylAc cotton on the number of species in different months were not very clear,but the effects of traditional cotton with pest controlled was very clear,The cotton bollworm was not the dominant insect in the transgenic CrylAc plus CpTI cotton field and transgenic CrylAc cotton field,but it was in traditional cotton field and control cotton field.