Regulation of leaf elemental composition in a subtropical river basin with diverse forest landscapes

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2024-10-25 DOI:10.1007/s11104-024-07039-1

Kundong Bai, Wenjun Li, Shihong Lv, Shiguang Wei, Xueqing Xu

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引用次数: 0

Abstract

Background and aims

Understanding the eco-evolutionary processes that govern leaf elemental composition in subtropical regions with diverse forest landscapes remains a challenge. Here, we investigated the phylogenetic and environmental regulation of leaf elemental composition in subtropical forests.

Methods

We sampled surface soils and leaves from herbs, ferns, deciduous woody species, and evergreen woody species across four forest landscapes (montane, valley, karst, and island forests) in the subtropical Lijiang River basin. We used phylogenetic comparative methods to identify regulators of leaf elemental composition.

Results

Leaf elemental concentrations varied significantly among growth forms, with evergreen woody species presenting the highest leaf C concentration relative to N, P, and K. Apart from C, leaf elemental concentrations also showed significant variations across forest landscapes; for instance, karst forest species exhibited the highest leaf Ca and Mg concentrations but the lowest leaf P concentration, reflecting pronounced P deficiency and enhanced supply of Ca and Mg. Phylogenetic signal, indicating phylogenetic conservatism, was significantly detected in leaf C, K, Ca, and Mg concentrations. Evolutionary model comparisons suggested that stabilizing selection towards multiple optima for growth forms best explained variation in leaf C concentration, while stabilizing selection towards multiple optima for each growth form within a specific landscape emerged as the dominant process for leaf N, P, K, Ca, and Mg concentrations.

Conclusions

Our study highlights the critical roles of leaf elemental conservatism and stabilizing selection towards multiple optima for growth forms within and across forest landscapes in regulating leaf elemental composition in subtropical region.

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亚热带流域多样化森林景观中叶片元素组成的调节作用

背景和目的在森林景观多样的亚热带地区，了解支配叶元素组成的生态进化过程仍然是一项挑战。方法我们在亚热带丽江流域的四种森林景观（山地林、河谷林、喀斯特林和岛屿林）中采集了草本植物、蕨类植物、落叶木本植物和常绿木本植物的表层土壤和叶片样本。除C外，叶片元素浓度在不同森林景观中也表现出显著差异；例如，喀斯特森林物种表现出最高的叶片Ca和Mg浓度，但叶片P浓度最低，反映出明显的P缺乏和Ca和Mg供应的增强。在叶片C、K、Ca和Mg浓度中发现了显著的系统发育信号，表明了系统发育的保守性。进化模型比较表明，对生长形式多重最优的稳定选择最能解释叶片 C 浓度的变化，而对特定景观中每种生长形式多重最优的稳定选择成为叶片 N、P、K、Ca 和 Mg 浓度的主导过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.