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入侵植物互花米草无性系生物量等级分配格局

发表时间:2011-09-15  浏览量:1144  下载量:562
全部作者: 肖燕,汤俊兵,清华,安树青
作者单位: 南京大学生命科学学院湿地生态研究所
摘 要: 选择产生一、二、三级分株的互花米草(Spartina alterniflora)无性系,对其各级分株生物量累积、分株生物量分配,以及各级分株生物量占无性系总生物量的百分比进行研究。结果表明:母株生物量在互花米草无性系中所占的比例最大,但是随着分株级别数的增加,母株在无性系中的比例逐渐降低。母株对叶和有性繁殖器官的投资比重高,而分株更多地把资源用于根系和无性繁殖器官的发育。无性系各分株采用不同的繁殖策略:母株侧重于通过种子进行长距离的繁殖体传播,同时避免与其年幼分株的种内竞争;而年幼分株侧重于通过无性繁殖与短距离扩张占据无性系周边的生境。
关 键 词: 生态学;互花米草;生物量分配;无性系;克隆植物;生物入侵
Title: Hierarchical biomass allocation patterns of invasive plant Spartina alterniflora clonal system
Author: XIAO Yan, TANG Junbing, QING Hua, AN Shuqing
Organization: Institute of Wetland Ecology, School of Life Science, Nanjing University
Abstract: Spartina alterniflora clones generating primary, secondary and tertiary clonal offspring were chosen and biomass of different generations to total biomass ratios and biomass allocations in different generations were examined. The mother ramets to whole clone biomass ratio were highest in the whole clone, but decreased with the increasing generations of clonal offspring. Mother ramets invested more on leaf and sexual reproduction, whereas clonal offspring invested more on root system and clonal reproduction. Clonal ramets showed different strategies within clones: mother ramets specialized in long-distance diffusion through seed which would avoid competition with their younger ramets; while younger ramets specialized in short-distance expansion by clonal reproduction to occupy the habitats around the developed clones.
Key words: ecology; Spartina alterniflora; biomass allocation; clones; clonal plant; biological invasion
发表期数: 2011年9月第17期
引用格式: 肖燕,汤俊兵,清华,等. 入侵植物互花米草无性系生物量等级分配格局[J]. 中国科技论文在线精品论文,2011,4(17):1572-1578.
 
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