摘要
对害虫经济阈值理论的再思考郝树广张孝羲（南京农业大学植物保护系，２１００９５）ＡＦｕｒｔｈｅｒＤｉｓｃｕｓｓｉｏｎｏｎｔｈｅＥｃｏｎｏｍｉｃＴｈｒｅｓｈｏｌｄｉｎＩＰＭ．ＨａｏＳｈｕｇｕａｎｇ，ＺｈａｎｇＸｉａｏｘｉ（ＤｅｐａｒｔｍｅｎｔｏｆＰｌａ...
The previous theories and methods of determining the economic threshold in Intergrated Pest Management(IPM) and some of their shortcomings were analysed in the paper. It was not satisfied to decide the economic threshold of pest only according to the rule of “cost of controlling=benefit of controlling”. A new method to define the economic threshold was put forward as follows:Y 2(N)-Y1(N)=C Y 2(N)/ C=1 or [Y 2(N)-C(N)]/N=0 [Y 2(N)-C(N)]/ C=0 where :Y 2(N)=production value of crop controlled;Y 1(N)=production value of crop uncontrolled;C(N)=cost of controlling;N=density of pest. The new concept and standard index system of economic threshold, which may be applied to “Intergrated Desease and Pest Control”(IDPC) in the future were discussed in detail.
出处
《生态学杂志》
CAS
CSCD
北大核心
1998年第2期71-77,共7页
Chinese Journal of Ecology
关键词
害虫
经济阈值
确定方法
economic threshold, injury level, pest management.
