杨干象对杨树生长的影响和防治指标的研究  

Influence of Cryptorrhynchus lapathi on growth of poplar and its prevention and control indicators

作　　者：夏志立 王德玉 谭丽娟 

机构地区：[1]朝阳县森防检疫站,辽宁朝阳122000

出　　处：《辽宁林业科技》2004年第1期12-14,共3页Liaoning Forestry Science and Technology

摘　　要：1995～2000年,对杨干象对杨树生长的影响和防治指标进行了研究。结果认为,不同虫口密度对杨树生长的影响明显,通过建立虫口密度与杨树生长(树高、胸径、材积)损失率回归预测模型表明,随着虫口密度的增加,胸径、材积生长明显下降,其关系呈直线、对数回归关系;高生长总的趋势是下降的,呈多项式回归关系;杨干象防治指标确定为:5年生以下杨树为2头/株,6～8年生杨树为3头/株,9年生以上杨树为4头/株。Influence of Cryptorrhynchus lapathi on growth of poplar and its prevention and control indicators were conducted from 1995 to 2000. The results showed that the influence of different population densities on poplar growth was significant. The established regression patterns between population density and rates of losses of poplar growth (height, DBH and volume) indicated that growth of DBH and volume decreased evidently as population density increased, which showed linear and logarithmic regression relationships respectively; the general trends of height growth declined and appeared a multinomial regression relationships. The prevention and control indicators of Cryptorrhynchus lapathi were determined as 2, 3 and 4 heads per tree for poplar aged below 5, 6-8 and 9-plus years old, respectively.

关 键 词：杨干象 杨树 生长损失率 防治指标 

分 类 号：S763.38[农业科学—森林保护学]