种子大小及其命运对植被更新贡献研究进展

种子是种子植物的繁殖体.种子对后代的资源投入将会直接影响后代的适合度进而影响到植被群落的更新.一般较大种子物种在种子萌发和幼苗生长阶段是具有较大优势的；但较小种子物种在逃避被动物采食和形成持久的土壤种子库成为植被更新的后备动力方面具有较大的优势.在不同的选择压力下,不同大小种子在以后的生活史中具有不同的命运，对植被的更新也具有不同的贡献.本文主要从种子大小和种子的传播散布、种子萌发、种子存活以及种子土壤库等方面综述了国外关于种子大小及其以后命运对植被更新贡献的研究结果，并对国内的相关研究提出了一些建议：种子生态学研究需要结合群落特点以及微环境等，开展从种子生产到幼苗更新全过程的系统性研究,为植物物种多样性保育和退化植被恢复方面提出有科学依据的管理措施.

Contribution of seed size and its fate to vegetation renewal: A review

Seed is the reproductive body of spermatophytes,and its resource devotion has a direct effect on the offspring fitness and the renewal of vegetation community.Generally,larger size seed has the superiorities of higher germination rate and seedling's establishment,while smaller size seed has the advantages in escaping the predation of animals and birds,forming soil seed bank,and exhibiting larger potentiality of vegetation renewal.Under various kinds of stress,different size seed has different fate in its life history,and has different contribution in vegetation renewal.This paper reviewed the research findings on the contribution of seed size and its fate to vegetation renewal,and presented some suggestions regarding the domestic research in the future.