水深对刺苦草生长和繁殖策略的影响研究

被引:29
作者
袁龙义
李守淳
李伟
邓光
张昭
机构
[1] 中科院武汉植物园水生植物生物学实验室
关键词
刺苦草; 水深; 生长; 繁殖策略;
D O I
10.16357/j.cnki.issn1000-5862.2007.02.013
中图分类号
Q948 [植物生态学和植物地理学];
学科分类号
071012 ; 0713 ;
摘要
调查研究西凉湖的刺苦草(V.spinulosa)在不同水深下的生长和繁殖策略,试图弄清是否水位的变化影响刺苦草的繁殖策略,进而影响刺苦草在湖泊中的分布情况.研究结果表明:在水深1.4~2.2 m的范围内,刺苦草有性繁殖体的生物量、有性繁殖体的收获系数和繁殖体个数都随水深的增加而减少.水深2 m以下,随着水深的增加,刺苦草的地上生物量和地下生物量逐渐增加;水深超过2 m后,生物量显著减少,刺苦草的有性繁殖受限.随着水位的变化,有性繁殖体的投资比率发生变化,从水深1.4 m的2.77%±0.96%到水深2 m的0.13%±0.22%;而无性分株繁殖方式水深2 m以下没有显著差异.当水深超过2 m时,无性分株数明显减少,约为492株/m2.水深不影响刺苦草的根冠比.
引用
收藏
页码:156 / 160
页数:5
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