固原退耕还林区经济林木甘肃鼢鼠防治经济阈值研究  

Study on the Economic Threshold Value for Zokor Control of Economic Forest in Guyuan Replacing Agriculture by Afforestation

作　　者：杨学军[1] 韩崇选[1] 李继光 张宏利[1] 王明春[1] 

机构地区：[1]西北农林科技大学国家林业局黄土高原林木培育重点实验室,杨凌712100 [2]宁夏回族自治区固原市原州区林业局,固原756000

出　　处：《林业科学》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

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.

关 键 词：退耕还林 经济林 鼢鼠 经济阈值 

分 类 号：S764.5[农业科学—森林保护学]