云杉阿扁叶蜂发生与环境因素的关系

云杉阿扁叶蜂Acantholyda piceacola Xiao et Zhou是为害青海云杉的主要害虫，为控制其危害，作者在祁连山大黄山林区对影响云杉阿扁叶蜂种群发生、发展的环境因素作了调查研究。结果表明，云杉阿扁叶蜂的发生与林分因子、地形地势和人畜活动关系密切，发生程度一般表现为疏林重于密林，纯林重于混交林，长势弱的林分重于长势好的林分，中幼龄树重于中老龄树；低海拔区重于高海拔区；人畜活动频繁区重于人烟稀少区。

Relationship between the occurrence of Acantholyda piceacola and enviorment foutors

Acantholyda piceacola Xiao et Zhou is an important pest insect in Picea crassifolia stands.In order to control its infestation,the factors influencing the population of the pest were studied in the Dahuangshan forest area in Qilian Mountains.The results indicated that the occurrence of Acantholyda piceacola was closely related to the forest stand conditions,topography and hypsography,and the activities of human and animals.The infestation of Acantholyda piceacola are more serious in sparse stands,pure stands,lower altitude stands than in dense stands,mixture stands and higher altitude stands.And in stands disturbed frequently by human and animals,the damage was also heavier than that in stands little disturbed by human and animals.