多年生龙胆属植物个体大小与花期资源分配研究

于各物种花中前期对青藏高原东部高寒草甸6种多年生龙胆属植物花期的繁殖分配和性分配进行分析,结果表明:(1)多年生龙胆属植物的植株个体越大,繁殖投入越高,繁殖分配越低;(2)随着植物个体的增大,对雌性、雄性和吸引结构的投入都在增加,这可保证资源的充分利用,不会因为单一部分的增加而造成资源的浪费;(3)6种龙胆属植物中,有4种其性分配结果与性别分配(SDS)的理论预测一致,即大个体更偏向雌性器官的资源投入,但麻花艽(Gentiana atraminea)和达乌里秦艽(Gentiana dahurica)的性分配与个体大小则没有表现出负相关,可能与其本身具有的雌雄异熟———雄性先熟特点有关;(4)资源在雌雄功能间的分配没有表现出权衡关系,可能是由于植物必须在许多不同生活史性状之间进行资源分配,而不是两两之间非此即彼.

Individual Size and Resource Allocation in Perennial Gentiana

The reproductive allocation and sex allocation of six perennial plants of Gentiana in Eastern Qinghai-Tibet Plateau Alpine Meadow was studied.The results showed that:(1)The larger of individual size,the higher of reproductive investment and the lower of reproductive allocation;(2)With the increasing of individual size,female function investment,male function investment and attractive structures investment increase.It can ensure that all the resource will be available fully without waste due to the increasing of a single part;(3)There are four results of sex allocation in the six kinds of Gentiana concordant with SDS theory prediction,that is to say,the larger individual allocates more resources to female function.The sex allocations of Gentiana atraminea and Gentiana dahurica Show no negative correlation with the individual size may be related to the Dichogamy-Protandry;(4)The distribution between female and male function of resource show no trade-off.It maybe caused by the truth that the resource distribution of plant must be under diverse life history character,not one kind with another.