摘要
对固原退耕还林区经济林木鼠害情况进行调查.结果表明：林木死亡率与鼢鼠密度之间呈显著相关关系：y=-1.923 4＋3.432 0x（r=0.934 8）.根据退耕还林区鼢鼠对不同定植年限山杏林木的危害造成的损失、防治费用和林木价格等,研究了固原地区退耕还林区经济林木鼢鼠防治阈值,并确定山杏定植1年时防治阈值为1.907只·hm-2,定植2～4年时为0.989～1.273只·hm-2,定植4～6年时为0.859～0.989只·hm-2.同时,以林木被害率和鼠口密度为指标,确定了退耕还林区经济林木鼠害程度划分标准.
It was investigated the harm of zokor for economic forest in Guyuan replacing agriculture by afforestation, the result showed that there was a marked correlative relation between the zokor density and the death rate of forest, y = - 1 .923 4 ＋ 3.432 0x（r = 0.934 8）. On the basis of the losses of economic forest to various planting years damaged by zokor, the control cost, the tree price of almond etc. , the control economic threshold value of zokor for economic forest was put forward. When the age of forest planted is 1 year, the control economic threshold value （density of zokor） is 1. 907 ind· hm^- 2, when the age ranges form 2 - 4, the density is 0. 989 ~ 1. 273 ind· hm^- 2, when the age ranges form 4 - 6, the density is 0. 859 ~ 0. 989 ind· hm^- 2. According to the zokor density and the death rate of forest. The author established the divisiory standard of zokor harm to economic forest in replacing agriculture by afforestation.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2006年第9期74-78,共5页
Scientia Silvae Sinicae
基金
国家十五攻关项目(2001BA509B07 -2 -02)的部分内容
关键词
退耕还林
经济林
鼢鼠
经济阈值
replacing agriculture by afforestation
economic forest
zokor
economic threshold value
