【摘要】 <正> 在落叶松(Larix olgensis Henry)人工林内,昆虫及其他节肢动物种群,由于其各种群本身的生物、生态学特性,相互作用及环境因子对它们的影响,造成种群的数量波动是经常性的,无论这种波动是否带有明显的规律性,都会对落叶松林这一生态系统带来影响。更多还原

【Abstract】 The species, quantity and population fluctuation of pests and their natural enemies are investigated in 1988 in larch-Scot pine and larch-Amorpha mixed forests at Panshi county of Jilin province. Shannon’s index H’, Simpon’s index D and Piolon’s index J’ are used to compare the popultion diversities of pests and their natural enemies in the two types of forest. Detailed results are presented in the paper.更多还原