生物多样性 ›› 1998, Vol. 06 ›› Issue (3): 167-171.DOI: 10.17520/biods.1998025

• 论文 • 上一篇    下一篇

长喙毛茛泽泻的生活史特征及濒危机制

王建波,陈家宽,利容千,何国庆   

  1. (武汉大学生命科学院,  武汉 430072)
  • 收稿日期:1997-09-15 修回日期:1997-12-02 出版日期:1998-08-20 发布日期:1998-08-20

Life history traits and mechanisms of endangerment in Ranalisma rostratum

WANG Jian-Bo, CHEN Jia-Kuan, LI Rong-Qian, HE Guo-Qing   

  1. College of Life Sciences , Wuhan University , Wuhan  430072
  • Received:1997-09-15 Revised:1997-12-02 Online:1998-08-20 Published:1998-08-20

摘要:

长喙毛茛泽泻(Ranalisma rostratum)是1种水生濒危植物,目前我国仅在湖南茶陵的湖里沼泽中生存有1个种群。在自然生境中,它在水深5~10 cm条件下生长良好,植株挺水。该植物以无性和有性两种方式生殖,无性繁殖体对种群的补充是保持自然种群大小的重要途径。虽然种子产量不是限制因素,但无性繁殖体和种子传播受限制、种子生活力及萌发率低、幼苗生长慢、在自然群落中竞争能力差、生境破坏很可能是导致这种植物濒危的重要原因。

AbstractRanalisma rostratum (Alismataceae) is an endangered aquatic plant , and now there exists only one population in China. In its natural habitat , Huli marsh in Chaling , Hunan Province , the best growing plants were observed at microsites where the water depth is five to 10 cm , and the plants grow in emergent form. R. rostratum reproduces asexually or sexually , and recruitment of asexual propagules into population is a very importment way to maintain the natural population size. Although seed production does not appear to limit R. rostratum , restricted dispersal of propagules and seeds , low seed viability , low germinability , slow growth of seedlings under all conditions , and habitat loss due to agriculture appear to be more important reasons for the endangerment of this plant .