转基因抗除草剂水稻对稻田叶冠层节肢动物群落多样性的影响

Diversity of arthropod community in the canopy of genetically modified herbicide-tolerant rice (Oryza sativa L.)

转基因抗除草剂水稻可能对稻田节肢动物产生影响。对转Bar基因抗除草剂籼稻"Bar68-1"和非转基因对照"D68"稻田叶冠层节肢动物群落的结构和特征进行调查、比较。结果显示,转基因水稻和非转基因对照水稻间的冠层节肢动物各亚群落中相对丰盛度高的物种(科)具有较大相似性,但在相对丰盛度低的科上有所差别;除2007年不喷药处理区天敌亚群落的Simpson指数(D)有差异外,转基因与非转基因对照稻田之间叶冠层节肢动物群落、亚群落的多样性指数(物种丰富度、Shannon-Wiener多样性指数、Pielou均匀度指数、Simpson优势集中性指数)差异不显著;在水稻分蘖中期、分蘖末期、齐穗期和乳熟期等4个生育期,95.3%的稻田节肢动物群落主要参数时间动态的品种间差异不显著。研究结果表明转Bar基因抗除草剂水稻"Bar68-1"对稻田叶冠层节肢动物的群落组成和多样性无显著影响。

Genetically modified herbicide-tolerant （GMHT） rice may have impacts on arthropods in paddy fields. To detect the potential effects of GMHT rice on arthropods, the structure and feature of canopy arthropod community in fields of GMHT rice ＂Bar68-1＂ were compared with those of non-GM control ＂D68＂. The families with high relative abundance of sub-communities of arthropod in GMHT rice field and non-GM rice field are similar, while the families with low relative abundance are different. There is no significant difference between GMHT rice and non-GM rice in the diversity indices, which are species abundance, Shan-non-Wiener diversity index, Pielou index, Simpson index, of arthropod communities （P0.05）, with the exception of Simpson index （D） in sub-community of natural enemy in no-pesticide treatment in 2007. Difference in dynamics of most indexes, accounting for 95.3% of all calculated indexes, of arthropod community between GMHT rice field and non-GM rice field are not significant in midtillering, late tillering, full heading stage and milk stage of rice. The results suggest that GMHT rice ＂Bar68-1＂ does not significantly affect the composition and diversity of arthropod community in canopy.