稻田节肢动物群落优势功能集团的垂直分布、数量动态及天敌作用估计

研究了稻田节肢动物群落中优势功能集团的垂直空间分布和数量动态规律.结果表明,狼蛛的分布范围不象过去认识的那样广,而是主要分布在稻株的中下部.蛸蛛也不仅仅限制在稻株叶冠层,其在受到农药干扰后,向下部转移.顶位物种与基位物种垂直空间分布的相关性不大.在稻田内影响天敌对褐飞虱种群动态控制作用大小的因素,除了天敌的数量之外,尚有天敌与褐飞虱的空间分布特征,褐飞虱占天敌食谱中的比例等.提出了包含天敌、褐飞虱、中性昆虫的数量动态、空间分布、取食特性等信息的评价天敌作用的模型.

Vertical distribution and quantitative dynamics of dominant functional groups of arthropod community in rice fields and estimation of natural enemy effects

The study showed that Lycosid (wolf spider) mainly distributed in the basal part of rice plants,not as wide as we know in past.Tetragnathid did not limited in the upper part of plants,but might translate to middle or lower part when affected by insecticide.The relationship between the vertical distributions of top and basal species was not significant.Besides the amount of natural enemies,the spatial distribution characteristics of natural enemies and brownplanthopper,and the proportion of brownplanthopper to total preys of natural enemies were the factors affecting the role of natural enemies on the population dynamics of brownplanthopper in rice fields.A model to evaluate the effect of natural enemies to brownplanthopper was put forward,which included the messages of quantitative dynamics,spatial distribution and feeding characteristics of natural enemies,brownplanthopper and neutral insects.