Root Morphology and Biomass Allocation of 50 Annual Ephemeral Species in Relation to Two Soil Condition.
Root Morphology and Biomass Allocation of 50 Annual Ephemeral Species in Relation to Two Soil Condition.
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DOI：
10.3390/plants11192495
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发表时间：
2022-09-23
期刊：
影响因子：
--
通讯作者：
Tan D
中科院分区：
文献类型：
--
作者：
Wang T;Huang L;Zhang X;Wang M;Tan D
不同的器官形态决定了植物获取资源的方式，而各器官生物量的比例是器官未来发挥功能的关键驱动力。遗憾的是，我们仍然缺乏对根系性状和幼苗生物量分配的全面了解。据此，我们调查收集了50个一年生短命树种的幼苗根系形态特征和生物量分配，以明确其对环境的适应情况。本研究结果表明，根组织密度（RTD）与根直径（RD）之间存在显着负相关（p < 0.05），这不符合一维根经济谱（RES）的假设。在此基础上，我们根据两种土壤条件将50种植物分为扎根于密砂或碎石沙（DGS）或松散沙（LS）组，以确定两组植物之间根系策略和植物策略的差异。我们的研究表明，DGS 生根的物种倾向于采用高渗透生根策略。然而，物种生根LS具有较高的资源获取效率。在全株水平上，50种短命植物沿资源获取和保护轴分布。物种生根DGS倾向于采用高茎生物量分数和低资源获取效率的保护策略，而物种生根LS倾向于采用高根和叶生物量分数和高资源获取效率的获取策略。研究成果为荒漠地区植被恢复和保护提供理论依据。
Different organ morphologies determine the manner in which plants acquire resources, and the proportion of biomass of each organ is a critical driving force for organs to function in the future. Regrettably, we still lack a comprehensive understanding of root traits and seedling biomass allocation. Accordingly, we investigated and collected the seedling root morphological traits and biomass allocation of 50 annual ephemeral species to clarify the adaptation to environment. The findings of this study showed that there was a significantly negative correlation between root tissue density (RTD) and root diameter (RD) (p < 0.05), which did not conform to the hypothesis of the one-dimensional root economics spectrum (RES). On this basis, we divided 50 plant species into those rooted in dense or gravelly sand (DGS) or loose sand (LS) groups according to two soil conditions to determine the differences in root strategy and plant strategy between the two groups of plants. Our study revealed that the species rooting DGS tend to adopt a high penetration root strategy. However, the species rooting LS adopt high resource acquisition efficiency. At the whole-plant level, 50 species of ephemerals were distributed along the resource acquisition and conservation axis. Species rooting DGS tend to adopt the conservation strategy of high stem biomass fraction and low resource acquisition efficiency, while species rooting LS tend to adopt the acquisition strategy of high root and leaf biomass fraction and high resource acquisition efficiency. The research results provide a theoretical basis for the restoration and protection of vegetation in desert areas.
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