机构地区:[1]井冈山大学生命科学学院,吉安343009 [2]南京林业大学森林资源与环境学院,南京210037
出 处:《生态学报》2015年第8期2602-2608,共7页Acta Ecologica Sinica
基 金:国家自然科学基金(31240015);江西省自然科学基金(20114BAB214011);江西省高等学校科技落地计划项目(KJLD12079);江西省教育厅科技项目(GJJ11717)
摘 要:为探究入侵植物胜红蓟在种群构件水平上的生长特性,以更好地了解其整体的生存策略和入侵性,通过测定胜红蓟各构件的生物量、各构件生物量相关性、繁殖构件/营养构件比和根冠比,对Ⅰ房前屋后、Ⅱ菜园地、Ⅲ桔园和Ⅳ路边4种不同生境下的胜红蓟种群构件的生物量分配进行了分析研究。结果表明:不同生境下胜红蓟种群各构件的生物量既存在差异,又存在相同的趋势,即:茎生物量>叶生物量>根生物量>花果生物量;生境Ⅱ胜红蓟总生物量、茎、叶和花果生物量均最大,生境Ⅳ的均最小,两者之间均存在显著差异(P<0.05);不同生境中胜红蓟种群的根、茎、叶、花果生物量分配与其各构件生物量大小顺序并不一致,前者各生境间的差异小于后者各生境间的差异;4种生境下繁殖构件与营养构件生物量比大小顺序依次为Ⅳ>Ⅲ>Ⅱ>Ⅰ,其值分别为0.069、0.061、0.050和0.042,根冠比大小顺序依次为Ⅲ>Ⅰ>Ⅳ>Ⅱ,其值分别为0.211、0.179、0.154和0.090;胜红蓟植株株高与各构件及各构件之间存在极显著正相关(P<0.01),株高与各构件的相关性中,株高与茎生物量的相关性最强,相关系数为0.525,各构件的相关性中,茎生物量与叶和花果生物量的相关性较强,其相关系数均大于0.900。胜红蓟种群在不同生境下各构件的生物量、繁殖构件/营养构件比和根冠比表现出的差异显示了其较强的表型可塑性和对异质环境的适应性,可能增强了其入侵性。不同生境下胜红蓟种群各构件生物量相同的趋势及生物量分配比间相对较小的差异显示了胜红蓟种群构件生物量分配模式的相对稳定性。胜红蓟种群各构件间的极显著相关性显示了其整体性的生存策略。In order to investigate the growth characteristics of invasive plant Ageratum conyzoides at the level of population module, and understand its survival strategies and invasiveness, the module biomass, the correlation among module biomass as well as, the ratios of reproductive module biomass/nutritional module biomass and of root/shoot were measured to determine its module biomass allocation in four different habitats (i.e. I front or behind house, Ⅱ vegetable farm, m orange orchard and 1V roadside). The results showed that, the module biomass of A. conyzoides in different habitats was different but it had same trendency, i.e. stem〉leaf 〉root〉flower and fruit. The total biomass and the biomass of stem, leaf, flower and fruit in habitat Ⅱ were the highest, the lowest in habitat IV, and there were significant differences between these two habitats (P 〈 0.05). The subsequence of module biomass allocation was inconsistent with that of module biomass in different habitats, and the differences for the former were less than those for the later. The ratios of reproductive module biomass/nutritional module biomass in four habitats followed as the subsequence of IV 〉 m 〉 n 〉 i, with the values of 0. 069, 0.061, 0.050 and 0.042 respectively, the root/shoot ratios followed as the subsequence of Ⅲ 〉 I 〉IV 〉 Ⅱ, with the values of 0.211, 0.179, 0. 154 and 0.090 respectively. There were highly significant positive correlation between plant height and module biomass, among biomass of different modules of A. conyzoides (P 〈 0.01 ). For the correlation between plant height and module biomass, the correlation between plant height and stem biomass was the strongest with the correlation coefficient of 0.525 ; for the correlation among biomass of different modules, the correlation coefficient between stem biomass and leaf, flower and fruit biomass was above 0.900. The differences of module biomass, ratios of reproductive module biomass/nutritional module biomass and root/shoot of A. conyzoides i
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