摘要
长喙毛茛泽泻（Ｒａｎａｌｉｓｍａｒｏｓｔｒａｔｕｍ）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５～１０ｃｍ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。
Ranalisma 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.
出处
《生物多样性》
CAS
CSCD
1998年第3期167-171,共5页
Biodiversity Science
基金
国家自然科学基金
关键词
长喙毛茛泽泻
生活史
濒危机制
Ranalisma rostratum, life history, mechanisms of endangerment
