两种践踏胁迫下克隆整合对入侵植物空心莲子草生长的影响  

Effects of clonal integration on growth of invasive plant Alternanthera philoxeroides under two kinds of trampling stress

作　　者：王宁[1,2] 高艳[1] 

机构地区：[1]井冈山大学生命科学学院,江西吉安343009 [2]井冈山生态环境研究中心,江西吉安343009

出　　处：《生态科学》2011年第2期97-101,共5页Ecological Science

基　　金：国家自然科学基金项目(30860054);江西省自然科学基金项目(2009GQN0073);江西省教育厅科学基金项目(GJJ09593;GJJ08504)

摘　　要：研究了两种践踏胁迫下克隆整合对入侵植物空心莲子草生长的影响。结果表明:(1)切断分株间的匍匐茎连接,会降低先端分株的生物量、分株数、总匍匐茎长度和总叶片数,但会显著增强基端分株的生物量。(2)对先端分株的践踏胁迫会显著降低先端分株叶片的叶绿素相对含量,对基端分株的践踏胁迫会显著降低基端分株的生物量和总匍匐茎长度。(3)对于基端分株的分株数、总匍匐茎长度和总叶片数来说,当进行基端分株践踏胁迫时,匍匐茎连接对其影响不大,而当进行先端分株践踏胁迫时,则明显对其不利。(4)对于整个克隆片段,践踏胁迫的差异和匍匐茎是否切断对其生长没有显著影响。Effects of clonal integration on growth of invasive clonal plant Alternanthera philoxeroides under two kinds of trampling stress were studied. The results are as follows. （1） Severed stolon connection decreased biomass, ramet number, total stolon length and leaf number of apical ramets; however, it obviously increased biomass of basal ramets. （2） Apical ramet trampling stress significantly decreased leaf number and relative chlorophyll content of apical ramets, and basal ramet trampling stress greatly decreased biomass and total stolon length of basal ramets. （3） Under basal ramet trample, stolon connection did not greatly affect ramet number, total stolon length, and leaf number of basal ramets; while it was obviously unfavorable for growth under apical ramet trampling stress. （4） The treatments of trample stress and stolon severing did not affect the performance of whole clonal fragments.

关 键 词：空心莲子草 克隆整合 入侵植物 践踏胁迫 叶绿素相对含量 

分 类 号：Q948.1[生物学—植物学]