Abstract: Gynostemma penaphyllumis a dioecious species with male-biased sex ratio in natural condition. In this paper ,the authors examined foraging behavior and reproductive stategies in the species in the same habitat based on the methods of comparative ecology. The preliminary results and conclusions are shown as follows:the ratio of biomass allocation to main branch in the male population is obviosly more than that in the female population,which implies the vegetative reproduction in the raios of biomass allocation other parts female and male popupation enhance greatly. In contrast, there are not much different in the raios of biomass alocation to other parts between the populations.

Key words: Gynostemma pentaphyllum, Female and male population, Foraging behavior, Reproductive strategies, Male-biased of sex ratio

摘要： 绞股蓝(Gynostemma pentaphyllum)雌雄异株，种群性比偏雄。作者利用比较生态学方法，从行为生态学角度探讨相同生境中绞股蓝雌雄种群的觅源行为和繁殖对策，得到如下初步结果和结论：(1)绞股蓝雄性种群的主枝生物量比显著大于雌性种群，这意味着雄性种群的营养繁殖投资显著增加，而两性种群在其它结构中的生物量分配无显著差异；(2)雌性种群的叶面积比和单位叶面积比雄性种群显著增加，这与两性种群的繁殖过程紧密相联；(3)雌雄种群在繁殖特征方面存在明显差异；(4)雄性种群个体间绝大多数行为特征的变异大于雌性种群；(5)雄性种群的低消耗、高效率、高潜力以及营养繁殖投资较高可能是绞股蓝种群性比偏雄的原因之一.

关键词: 绞股蓝, 雌雄种群, 觅源行为, 繁殖对策, 性比偏雄