不同抗性品系稻田捕食性节肢动物群落的结构和动态

The structure and dynamics of the predatory arthropod communities in different resistant variety rice fields

通过野外调查,对粳籼89、七桂早、七袋占3个不同抗性品种水稻田中捕食性节肢动物群落的结构、动态等方面进行了研究。结果表明:水稻品种抗性对捕食性节肢动物群落结构的影响不显著。高抗虫性品种样田中节肢类捕食性天敌的迁入虫口密度和总的虫口密度相对较低,群落物种丰富度、多样性、均匀指数也呈下降趋势。中抗品种与天敌群落的共同作用,能有效地控制稻飞虱的数量。中抗品种稻田中天敌群落的迁入虫口密度和总虫口密度都高于感性样田和高抗样田,天敌群落的物种丰富度、多样性和均匀性高于抗性样田。

The structure and dynamics of the predatory arthropod communities were analyzed,in the paddy fields of various resistant rice varieties.The dominant predator species were massed when the resistance of variety was increased.Resistance of variety gave little effects to the structure of predatory communities.In paddy fields of medial resistant rice varieties,the coordination effects between resistant rice varieties and predator communities were found.Not only were the initial and total densities of predators higher than those of strong or susceptible varieties,but also the species diversity,abundance,and evennesses of predatory arthroped communities were tended to rise.