稻田生态系统中飞虱、叶蝉及其天敌的种群动态和相互关系

Population Dynamics of Delphacids and Cicadellids and Relationship with Their Natural Enemies in Rice Ecosystem

系统研究了稻田和稻田周围非稻田生境中飞虱、叶蝉和寄生性天敌的种类、分布及其相对丰盛度，并阐明了不同生境间同翅目寄主和天敌的相互关系．稻飞虱和稻叶蝉在非稻田生境中的数量很低，然稻田重要卵寄生蜂Ａｎａｇｒｕｓｓｐｐ．Ｏｌｉｇｏｓｉｔａｓｐｐ．和Ｇｏｎａｔｏｃｅｒｕｓｓｐｐ．在非稻田生境中的平均密度很高．多样性指数低的植被上存在更多的飞虱和叶蝉，同时也保存了许多寄生性天敌．水稻移栽后稻田中节肢动物的数量逐渐上升。

This paper deals with the species,distribution and relative abundance of homopterans and associated egg parasitoids in both rice and surrounding non rice habitats,the relationship of egg parasitoids with vegetations is discussed also.A very low density of rice planthoppers and leafhoppers is found in the non rice habitats,however,an abundance of egg parasitoids, Anagrus spp., Oligosita spp. and Gonatocerus spp.exists in the surrounding non rice habitats.The vegetation with less diversity index support more homopterans and associated egg parasitoids,having obviously effects on the neighboring rice fields.The number of homopterans and egg parasitoids increase gradually in rice fields after newly rice transplanting,reaching sympotom at the 4th week.