甘蓝田节肢动物群落结构研究

在田间系统调查基础上研究了合肥郊区甘蓝田节肢动物群落结构。调查共记录节肢动物21种，其中害虫10种，天敌11种。害虫主要优势种为菜青虫和菜蚜为优势种；捕食性天敌主要优势种为中华跃蛛、草间小黑蛛。害虫优势种菜青虫主要分布于甘蓝心叶和内层叶反面，而菜蚜分布较广。捕食性天敌优势种中华跃蛛、草间小黑蛛主要分布于甘蓝外层叶反面。群落多样性在时间过程中较稳定，影响群落多样性的主要因素是群落均匀度。

Studies on Structure of Arthropod Communities in Cabbage Fields

Based on a systematic field investigation, the structure of arthropod communities in cabbage fields in the suburbs of Hefei was studied. The results showed that there were 21 species of arthropods, including 10 species of insect pests and 11 species of natural enemies .The major dominant species of insect pests were Pieris rapae and Lipaphis erysimi and the major dominant species of predatory enemies were Sittius sinensis and Theridium graminicola. Pieris rapae distributed mainly on heartleaves and back of inner leaves of cabbage plant, and Lipaphis erysimi distributed widely in cabbage plants. Sittius sinensis and Theridium graminicola distributed mainly on back of outer leaves of cabbage plants .The diversities of the communities were relatively stable in time sequence. The principal factor affecting the diversities was species evenness