湿地松粉蚧自然种群生命表的组建和分析

CONSTRUCTION AND ANALYSIS OF THE LIFE TABLE FOR NATURAL POPULATION OF THE LOBLLOLY PINE MEALYBUG Oracella acuta

通过采用林间系统调查，平均历期法，组建得到湿地松粉蚧自然种群连续世代生命表，结果表明：越冬代初龄若虫期至第一代初龄若虫早期时的种群趋势指数Ｉ值为５．７０，完整第一代结束时间的Ｉ值为０．９２，表明下代种群数量将为当代种群数量的５．７０和０．９２倍；在新侵入区，没有发现寄生性天敌，捕食性天敌的排除作用控制指数ＥＩＰＣ为１．２６，表明捕食性天敌对该粉蚧的控制作用不明显；“其它”类因子是影响种群数量发展趋势的重要因子，其ＥＩＰＣ值为８３．６８。

Construction and analysis of the life table for natural population of Oracella acuta inSouthern Guangdong Provinee were discussed Based on the data of systematic surveyin the pine forest,the initial number and the survival rates in several stages were esti-mated respectively,The results showed that the trend index of the population dynamics(1-values)of the pest fro moverwintering crawler stage to crawler stage of the 1stgenerationand the 1st generation completing develo pment were 5.70,0.9 2 respectively,parasitio ids on the lnealybug were uno bserved and the sup pressio n effect o f p redato rson the pest was not obvious.The exdusive index of population control(EIPC )was1.26,i.e.,the next population of the pest wouldincrease 1.26 times if the naturalenemies were excluded.The important factors suppressing the natural population ofO. acuta was“ others ”which total EIPC was 83.68.