外来种喜旱莲子草的克隆生长特性

外来种喜旱莲子草的克隆生长特性 Clonal Growth of the Invasive Species Alternanthera philoxeroides（Mart.） Griseb 王炳锐 WANG Bing-rui 1 2 first-author 王建波 WANG Jian-bo 1 2 武汉大学生命科学学院/植物发育生物学教育部重点实验室 武汉大学生命科学学院/植物发育生物学教育部重点实验室 College of Life Sciences,Wuhan University /Key Laboratory of the Ministry of Educationfor Plant Developmental Biology College of Life Sciences,Wuhan University /Key Laboratory of the Ministry of Educationfor Plant Developmental Biology 武汉大学生命科学学院/植物发育生物学教育部重点实验室,湖北,武汉,430072 武汉大学生命科学学院/植物发育生物学教育部重点实验室,湖北,武汉,430072 通过对外来种喜旱莲子草（Alternanthera philoxeroides（Mart.）Griseb）生长指标的测定和分析,研究了它的克隆生长规律,并探讨了它的觅食行为.在一个生长季节内,喜旱莲子草生物量增加了近30倍,一级匍匐茎分株数增加了近50倍,最长的一级匍匐茎长度增长了近40倍,一级匍匐茎总长度增长了近13倍;一、二、三级匍匐茎上的总分株数增加了近130倍,3个级别匍匐茎总长度增长了近28倍.通过各级匍匐茎个数,匍匐茎总长度和匍匐茎总分株数比较发现,二级匍匐茎比一、三级匍匐茎生长的都要快,而一级匍匐茎的间隔物平均长度远远大于二级和三级匍匐茎.克隆植物的觅食行为与它的克隆生长紧密相连,从觅食行为来看,喜旱莲子草克隆构型随生长季节的变化说明了它对生长季节具有很强的适应性.这种快速克隆生长的特性和对生长季节的适应性有利于喜旱莲子草成功入侵新的生境. Alternanthera philoxeroides（Mart.） Griseb（Amaranthaceae） is an invasive species in China.A study regarding to its clonal growth characteristics was presented here.Also,we discussed its foraging behaviour associated with its clonal growth.The measured growth parameters were biomass,total length of each creeping stem,ramet numbers of each creeping stem,average spacer length of each creeping stem,the length of the longest primary creeping stem.During its one-year growing season,there were about 30 times increase in its biomass,50 times increase in the ramet numbers of its primary creeping stems,40 times in the length of its longest creeping stem and about 13 times increase in the total length of the whole creeping stems.The total ramet numbers of all creeping stems increased by about 130 times and the total length of all these creeping stems by about 28 times.With the comparison among the number of creeping stems,the total length and ramet numbers of each creeping stem,we found that the secondary creeping stems grew more rapid than the primary and the third ones.Moreover,the average spacer length of the primary creeping stems was longer than those of the secondary and the third creeping stems.Foraging behaviour in clonal plants is tightly associated with its clonal growth,as far as foraging behaviour is concerned,clonal architecture of Alternanthera philoxeroides changed by its growing seasons showed that it has great adaptation to growing seasons.This rapid clonal growth characteristics and great adaptation to growing seasons could be benefit to its successful invasion. 喜旱莲子草 外来种 匍匐茎 克隆生长 觅食行为 Alternanthera philoxeroides（Mart.） Griseb invasive species creeping stem clonal growth foraging behaviour X173 国家自然科学基金资助项目（30170177） 2005-06-01 2021-04-01 6