摘要
不同温度对麦二叉蚜繁殖历期的影响差异不大,但对一个世代的产若蚜数差异明显,日产若蚜高峰相差近40天,13.5℃条件下,峰期出现在产仔的初期。 7.5℃和13.5℃温度下,麦二叉蚜种群增长的趋势指数(Ⅰ)、内禀增长力(r_m)和周限增长率(λ)都有明显差异。在7.5℃时,Ⅰ=27.6,r_m=0.0698,λ=1.072;而在13.5℃时,Ⅰ=40.3,r_m=0.1097,λ=1.116。由于周限增长率都较高,这就导致了在稳定年龄组配中,若蚜所占比例偏大(若蚜为86.65％和81.98％)。
Under 7.5℃ and 13.5℃ temperature conditions,there was no sig-nificant difference between the two reproduction durations of greenbugSchizaphis graminum (Rondani ),while the two fecundities of one gene-ration were evidently different,the interval of two peak reproductiondates was about 40 days,and the latter occurred in early birth stage. The indices of population trend,intrinsic growth rates,and cyclicincrease rates under these two experimental temperatures were 27.6 and40.3,0.0698 and 0.1097,and 1.072 and 1.116,respectively.The ratherhigh cyclic increase rates in both cases caused the higher proportionsof immatures,86.85% and 81.98%,respectively,in the stable agedistribution.
出处
《植物保护学报》
CAS
CSCD
北大核心
1990年第1期35-39,共5页
Journal of Plant Protection
关键词
麦二叉蚜
种群增长
温度
Schizaphis graminum——temperatures——population fluctuation
