摘要
在简要评述经济阈值在森林有害生物,尤其是蛀干害虫综合治理中的局限性和特点的基础上,针对不同林种的主要经营目标,首次提出了防护林生态阈值的概念,分析了生态阈值与经济阈值的区别和特点.对宁夏青铜峡市防护林中的杨树天牛生态阈值进行了初步的研究.结果表明:羽化孔可以作为合作杨生态阈值的特征指标值;在甘城子乡,树龄为8～10a,合作杨与新疆杨的混交比例为1∶3,并在其它病虫危害甚轻和非生物因素的不良影响可忽略不计时,合作杨的杨树天牛生态阈值是48个羽化孔,其区间值为[4,6].
On the basis of review on characteristics and limitations of economic threshold(ET) in integrated pest management (IPM) of forest pests, especially forest borers, the concept of ecological threshold (ECT) in shelter belt forest is expounded firstly according to management purposes of different forest kinds. The distinctions between ECT and ET and their characteristics are discussed. Preliminary studies are conducted to test ECT of poplar longicorn beetles( Anoplophora glabripennis and A.nobilis ) in shelter belt forest in Qingtongxia City, Ningxia. The results show that emergence holes of the beetles can be acted as characteristic indicator value of ECT of Populus opera (P. simonii×P. pyramidalis ). In Ganchengzi township, neglecting the influence of other pests and factors of non organism, the ECT of the beetle is 4.8 emergence holes in mixed forest of 8～10 years old ,by P. opera (P. simonii×P. pyramidalis ) and P. alba var. pyramidalis at a ratio of 1∶3. The range of the ecological threshold is 4～6.
出处
《北京林业大学学报》
EI
CAS
CSCD
北大核心
1999年第6期45-51,共7页
Journal of Beijing Forestry University
基金
"九五"国家科技攻关专题!( 96 0 0 5 0 4 0 1 )
关键词
生态阈值
经济阈值
杨树天牛
防护林
ecological threshold, economic threshold, poplar longicorn beetle, shelter belt forest
