Intraspecific variation in fine root morphology of European beech: a root order-based analysis of phenotypic root morphospace.

IF 2.3 2区 环境科学与生态学 Q2 ECOLOGY Oecologia Pub Date : 2024-05-01 Epub Date: 2024-05-02 DOI:10.1007/s00442-024-05558-3
Eva Rüther, Dietrich Hertel, Christoph Leuschner
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Abstract

Fine roots are multifunctional organs that may change function with ageing or root branching events from primarily absorptive to resource transport and storage functions. It is not well understood, how fine root branching patterns and related root functional differentiation along the longitudinal root axis change with soil chemical and physical conditions. We examined the variation in fine root branching patterns (the relative frequency of 1st to 4th root orders) and root morphological and chemical traits of European beech trees with soil depth (topsoil vs. subsoil) and soil chemistry (five sites with acid to neutral/alkaline bedrock). Bedrock type and related soil chemistry had an only minor influence on branching patterns: base-poor, infertile sites showed no higher fine root branching than base-rich sites. The contribution of 1st-order root segments to total fine root length decreased at all sites from about 60% in the topsoil (including organic layer) to 45% in the lower subsoil. This change was associated with a decrease in specific root area and root N content and an increase in mean root diameter with soil depth, while root tissue density did not change consistently. We conclude that soil depth (which acts through soil physical and chemical drivers) influences the fine root branching patterns of beech much more than soil chemical variation across soil types. To examine whether changes in root function are indeed triggered by branching events or result from root ageing and diameter growth, spatially explicit root physiological and anatomical studies across root orders are needed.

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欧洲山毛榉细根形态的种内变异:基于根序的表型根形态空间分析。
细根是多功能器官,其功能可能会随着老化或根系分枝事件而改变,从主要吸收功能转变为资源运输和储存功能。目前还不太清楚细根的分枝模式以及沿纵向根轴的相关根功能分化是如何随土壤化学和物理条件变化的。我们研究了欧洲榉树的细根分枝模式(第 1 至第 4 根阶的相对频率)以及根系形态和化学特征随土壤深度(表层土与底层土)和土壤化学性质(5 个基岩为酸性至中性/碱性的地点)的变化。基岩类型和相关的土壤化学成分对分枝模式的影响很小:基质贫瘠、土壤贫瘠的地点的细根分枝率并不比基质丰富的地点高。在所有地点,1阶根段对细根总长度的贡献率都有所下降,从表层土壤(包括有机层)的约 60% 降至下层土壤的 45%。随着土壤深度的增加,这种变化与比根面积和根N含量的减少以及平均根直径的增加有关,而根组织密度并没有持续变化。我们的结论是,土壤深度(通过土壤物理和化学驱动因素发挥作用)对山毛榉细根分枝模式的影响远大于不同土壤类型之间的土壤化学变化。为了研究根系功能的变化究竟是由分枝事件引发的,还是由根系老化和直径增长导致的,需要对不同根系进行空间明确的根系生理和解剖学研究。
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来源期刊
Oecologia
Oecologia 环境科学-生态学
CiteScore
5.10
自引率
0.00%
发文量
192
审稿时长
5.3 months
期刊介绍: Oecologia publishes innovative ecological research of international interest. We seek reviews, advances in methodology, and original contributions, emphasizing the following areas: Population ecology, Plant-microbe-animal interactions, Ecosystem ecology, Community ecology, Global change ecology, Conservation ecology, Behavioral ecology and Physiological Ecology. In general, studies that are purely descriptive, mathematical, documentary, and/or natural history will not be considered.
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