Position: Home > Articles > Characteristics of Allometric Growth of Tithonia diversifolia, an Alien Invasive Plant
Journal of West China Forestry Science
2020
(1)
156-161
外来入侵植物肿柄菊的异速生长特征
作 者：
焦杨;程希平;王四海
单 位：
西南林业大学地理与生态旅游学院
关键词：
异速指数;外来入侵植物;肿柄菊;植物构件
摘 要：
植物异速生长特征能反映植物对环境的适应状况和应对环境变化的能力。为探讨外来入侵植物肿柄菊异速生长规律,本文通过对肿柄菊入侵地自然分布的群落进行随机取样,分析植物密度调控规律,以及植株构件性状之间的异速关系。结果表明,丛密度与每丛生物量之间的异速指数为-1.210 6(P<0.01),枝密度与每枝生物量之间的异速指数为-1.033 7(P<0.01)。丛密度和枝密度变化对群落单位面积地上生物量的积累没有影响(P>0.05)。分枝基茎粗与花序数、分枝长度与花序数、分枝基茎粗与长度之间的异速指数在不同的群落间变化较大,植株构件性状之间的异速关系不稳定。随着肿柄菊群落枝密度增加,分枝基茎粗与花序数之间异速指数显著增大(P<0.01),枝密度增加有促进分枝产生更多花序的趋势;肿柄菊群落丛密度的增加能促使分枝基茎粗与长度之间异速指数的增大(P<0.01),这表明丛密度的增加会使分枝生长更长。以上结果表明,肿柄菊异速生长关系会随着群落环境变化而改变,这种改变可能有利于肿柄菊对不同环境的入侵,增强其适应环境的能力。
译 名：
Characteristics of Allometric Growth of Tithonia diversifolia, an Alien Invasive Plant
作 者：
JIAO Yang;CHENG Xi-ping;WANG Si-hai;College of Geography and Ecotourism,Southwest Forestry University;Yunnan Academy of Forestry and Grassland;
关键词：
allometric exponent;;alien invasive plant;;Tithonia diversifolia;;plant modules
摘 要：
Allometric growth characteristics could reflect adaptability of plants to environment.In order to study the law of allometric growth of Tithonia diversifolia,we sampled randomly in the natural communities of T.diversifolia,and analyzed the density-dependent regulation and the allometric relationship between individual plant modules.The results showed that:(1)The allometric exponent between cluster density and its above-ground biomass was-1.210 6(P<0.01), and the allometric exponent between branch density and its above-ground biomass was-1.033 7(P<0.01).The cluster and branch density were not relationship with biomass per unit area(P>0.05).(2)These allometric exponents between stem-base diameter,length of branch and capitulum number showed fluctuation in the different community of T.diversifolia.(3)Branch density was positive correlated with the allometric exponents between stem-base diameter and capitulum number(P<0.01),and cluster density was also positive related to the allometric exponents between stem-base diameter and length of branch(P<0.01).These indicated that high branch and cluster density could promote richer capitula and longer branches respectively.The results showed variable allometric relationships of T.diversifolia could improve invasiveness and adaptation to diverse environment.
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