青海云杉种实害虫发生与环境条件关系的调查研究  

Study on relation between enviroment and the ocurrence of seed insect of Picea crassifolia

作　　者：尹承陇 王桑 汪有奎 张耀荣 李进军 

机构地区：[1]甘肃省林木种苗管理总站 [2]甘肃省祁连山国家级自然保护区管理局 [3]甘肃省森林病虫害防治检疫站 [4]天祝县林业局

出　　处：《甘肃林业科技》1999年第1期31-34,共4页Journal of Gansu Forestry Science and Technology

摘　　要：青海云杉种实害虫的主要种类为云杉球果小卷蛾，主要发生于天然林及母树林，虫害株率高达１００％。发生规律为低海拔林分重于高海拔林分，老母树林重于新母树林，纯林、疏林重于混交林和郁闭林分，与天然林相距较远的种子园内无直接种子害虫发生。在同一山坡上，依坡位升高虫害减轻，平缓坡林分重于陡坡林分，不同坡向间无明显差异；干燥林分重于湿润林分。虫害果与健康果相比，出种率下降２．４％，健饱种数下降１８．３％，种子虫蛀率达１６．２％，千粒质量下降０．９３ｇ，发芽率降低２８％（平均单果虫口密度在３头左右）。Cydia strobilella,as a main seed insect of Picea crassifolia,is usually have been found in nature forest and seed stands, and the percentage of tree been infected counld come to 100%. The severity order of insect damage follows the law:stands in low latitute、old seed stands、pure forest and thin stands are more than it in high latitute、young seed stands、mixed forest and close forest respectively. In the same slope, it reduced with slope location and slope degree going up. There is no significant difference in different slope orientation, and it of the dry stands is more than humid stands. Furtheremore, seeds in seed orchard which is far to nature forest.

关 键 词：青海云杉 种实害虫 环境条件 调查 云杉 

分 类 号：S763.711.8[农业科学—森林保护学]