准噶尔荒漠6种类短命植物生物量分配与异速生长关系

发布时间：2018-02-26 02:31

本文关键词： 生活型类短命植物生物量异速生长指数繁殖分配准噶尔荒漠　出处：《草业学报》2014年02期 　论文类型：期刊论文

【摘要】：类短命植物是我国荒漠植物区系中重要而独特的组成部分。准噶尔荒漠是类短命植物在中亚干旱区分布的最东端。目前关于类短命植物生物量分配及异速生长关系的研究较少。选择了百合科的小山蒜、棱叶韭、粗柄独尾草、黑鳞顶冰花、伊犁郁金香以及菊科的细叶鸦葱共6种植物作为研究对象,对比研究了其生物量分配及异速生长关系的异同。结果表明,6种类短命植物单株总生物量在0.628~21.144g之间,根冠比在0.355~3.066之间,叶片生物量比例在0.092~0.289之间,繁殖分配比例在0.111~0.649之间。6种植物用于繁殖器官和光合器官的生物量分配各不相同,表明不同科、不同属及同属不同种之间的生物量大小及器官分配比例无一致规律。大部分物种根冠比随个体增大而显著下降,而繁殖分配则呈显著的异速增加的趋势。6种植物器官生物量间(共45对)大部分(40对)表现为等速生长关系(即异速生长指数为1),而且地上与地下生物量间及叶片与地下生物量间还各自具有共同的异速生长指数(分别为0.8764和0.8585),表现出强烈的功能趋同性。但6个物种间没有出现完全一致的相关生长关系,这可能归因于由系统分类地位决定的遗传特性的差异。
[Abstract]:Short-lived plants are an important and unique part of the desert flora in China. Junggar Desert is the easternmost part of the distribution of short-lived plants in the arid region of Central Asia. Few studies have been carried out in the Liliaceae. Six species of plants, including leek, Cymbidium caudata, Ilystra tulip and Compositae, were used as the research objects. The results showed that the total biomass of 6 species of short-lived plants was between 0.628 and 21.144g, the ratio of root to shoot was between 0.355 and 3.066, and the ratio of leaf biomass was between 0.092 and 0.289. The proportion of reproductive distribution between 0.111 and 0.649 was between 0.111 and 0.649, indicating that the biomass distribution of reproductive organs and photosynthetic organs was different, indicating that the distribution of biomass was different in different families. The biomass size and organ allocation ratio of different genera and different species of the same genus were not consistent. The root-shoot ratio of most species decreased significantly with the increase of individuals. The reproductive allocation showed a trend of significant allometric increase. 6. The biomass of plant organs (45 pairs), most of 40 pairs, showed isokinetic growth relationship (I. e., the isokinetic growth index was 1%), and the relationship between aboveground and underground biomass and leaf. The isokinetic growth indices (0.8764 and 0.8585N, respectively) shared by the subsurface biomass showed strong functional convergence, but there was no complete correlation between the six species. This may be attributed to differences in genetic characteristics determined by the taxonomic status of the system.
【作者单位】：中国科学院干旱区生物地理与生物资源重点实验室中国科学院新疆生态与地理研究所;中国科学院大学;
【基金】：国家自然科学基金项目(41201056) 国家重点基础研究发展计划项目(2014CB954200)资助
【分类号】：Q948

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