Biomass allocation patterns and allometric relationships of six ephemeroid species in Junggar Basin,China
Biomass allocation patterns and allometric relationships of six ephemeroid species in Junggar Basin,China
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发表时间：
2014
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通讯作者：
Y. Tao
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作者：
Y. Tao
短命植物是我国荒漠植物群的重要组成部分，准噶尔盆地是中亚干旱区短命植物分布的最东端，目前对短命植物的生物量分配和异速生长关系的研究还很少，本文对新疆荒漠区短命植物的6个种：白葱Alliumpallasii，蓝葱Alliumcaeruplum，独尾草Eremurusinderiensis，黑顶冰花和伊犁郁金香（均属于百合科）和小鸦葱（菊科）作为目标植物，每种植物约有20~35株。采用方差分析和Levene检验分析了6种短命植物生物量分配的相似性和差异性，并采用幂函数分析了根冠质量比（R/S）与植株大小的关系利用普通最小二乘法对6种植物的地上生物量和生殖分配比与植株大小之间的关系进行了研究（OLS，即模型类型I）回归。（军事革命，即型号II）利用SMARTR软件对6个种间异速生长关系的相似性和差异性进行了回归分析，结果表明：6种植物的单株总生物量在0.628~21.144g之间，根冠质量比（R/S）在0.355~3.066之间，叶总质量比在0.092~0.289之间，生殖分配比率（RAR）生殖器官和光合器官的生物量比值在6种植物间存在差异，表明生物量及其在不同科、不同属和属内不同种间的分配比例没有规律性，大多数种的R/S随植物个体的增大而显著下降，而RAR随个体大小的增加呈显著的增加趋势，大部分种对（40对各器官生物量（共45对）呈等轴关系（即它们的异速生长标度指数为1.0），地上-地下生物量对，叶-地下生物量对表现出共同的异速生长标度指数（0.8764）和（0.8585），表现出较强的功能趋同性，但它们并没有表现出与6种短命植物相同的异速生长关系，这可能是由于分类位置决定的遗传特性的差异。
Ephemeroid species are an important and special component of the desert flora in China.The Junggar Basin is the easternmost area where the ephemeroid species distribute in arid areas of central Asia.Up to now, there are very few studies on biomass allocation and the allometric relationships of ephemeroid species.Six species,Allium pallasii,Allium caeruleum,Eremurus inderiensis,Gagea nigra and Tulipa iliensis(all belong to Liliaceae)and Scorzonera pusilla(Asteraceae)were chosen as target plants,and about 20to 35individual plants of each species were obtained.The One-way ANOVA and Levene's test were used to analyze the similarity or difference in biomass allocation among six ephemeroid species.The power function was used to test the relationship between the root to shoot mass ratio(R/S)and plant size(aboveground biomass)and between the reproduction allocation ratio(RAR)and plant size of six species using ordinary least squares(OLS,i.e.Model Type I)regression.The reduced major axis(RMA,i.e.Model Type II)regression was employed to analyze the similarity or difference in allometric relationships among six species using SMARTR software.The results showed that the total individual plant biomass of six species ranged from 0.628g to 21.144g,root to shoot mass ratios(R/S)ranged from 0.355to 3.066,leaf to total plant mass ratios ranged from 0.092to 0.289,and reproduction allocation ratios(RAR)ranged from 0.111to 0.649.The biomass ratios of reproduction organ and photosynthetic organ were different among six species,indicating that there was no regular pattern of biomass and its allocation ratios among different families,different genera and different species in a genus.R/S of most species declined markedly with the plant body size,while the RAR showed significant increasing tendency with the body size.Most(40pairs)of the species pairs(45pairs in total)of organ biomass represented isometric relationships(i.e.their allometric scaling exponents were 1.0),and the aboveground-belowground biomass pairs,leaf-belowground biomass pairs exhibited common allometric scaling exponents(0.8764and 0.8585)respectively,showing strong functional convergence.However,they did not show the same allometric relationship of six ephemeroid species,which might be due to the difference in the genetic property determined by the taxonomic position.