温带森林树木的根系吸水深度:由邻里和环境形成的物种特有模式。

IF 3.6 3区 生物学 Q1 PLANT SCIENCES
Plant Biology Pub Date : 2025-06-16 DOI:10.1111/plb.70058
C A Hackmann, S S Paligi, M Mund, D Hölscher, C Leuschner, K Pietig, C Ammer
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引用次数: 0

摘要

根系水分吸收调节植物蒸腾和内部水分供应。中欧的森林日益面临水资源限制,这突出了了解树木水源和消耗的必要性。然而,关于树木吸水深度及其随树种特征、邻近地区、地点和环境条件变化的知识仍然很少。利用稳定水同位素对欧洲山毛榉(Fagus sylvatica)、花旗松(Pseudotsuga menziesii)和挪威云杉(Picea abies)纯林分和混合林分的水分吸收深度进行了研究。调查包括在四个地点进行自然丰度采样,并在其中一个地点进行每周一次的底土示踪剂实验(1米矿物土壤深度)。欧洲山毛榉和道格拉斯冷杉比挪威云杉进入相对较深的水域。山毛榉与两种针叶树混合使用较深的水,而云杉与山毛榉混合使用较浅的水。杉木纯林分与混交林分差异不显著。最深层的吸收发生在排水良好的沙质土壤上,而最浅的吸收发生在偶尔静止的土壤上。示踪剂实验显示,来自地下水的贡献相对较低(约占9%);有机层对水分的贡献相似,但随树木耗水量的变化更动态。我们的研究结果强调了物种特异性特征和混合效应在森林水循环中的重要性,以及它们如何受到场地和环境条件的调节。花旗冷杉似乎比挪威云杉更抗旱,因为它能获得更深的水源。我们得出结论,山毛榉和花旗松可以平等共存,而山毛榉的存在加剧了云杉的干旱暴露。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Root water uptake depth in temperate forest trees: species-specific patterns shaped by neighbourhood and environment.

Root water uptake regulates plant transpiration and internal water supply. Forests in Central Europe increasingly face water limitations, highlighting the need to understand tree water sources and consumption. However, knowledge about water uptake depth and how it varies with tree species identity, neighbourhood, site, and environmental conditions remains scarce. We used stable water isotopes to study water uptake depth in pure and mixed stands of European beech (Fagus sylvatica), Douglas fir (Pseudotsuga menziesii), and Norway spruce (Picea abies). Investigations included natural abundance sampling at four sites, and a weekly subsoil tracer experiment (1 m mineral soil depth) at one of these sites. European beech and Douglas fir accessed relatively deeper water than Norway spruce. Beech used deeper water in mixtures with both conifers, while spruce shifted to shallower layers in mixture with beech. Douglas fir showed no significant difference between pure and mixed stand. Deepest uptake occurred on well-drained, sandy soil, while shallowest uptake was on an occasionally stagnic soil. The tracer experiment revealed a relatively low contribution from subsoil water (>1 m, ca. 9%); the organic layer contributed similar magnitudes, but varied more dynamically with tree water consumption. Our results emphasize the importance of species-specific traits and mixture effects in forest water cycles, and how they are mediated by site and environmental conditions. Douglas fir appears more drought resistant than Norway spruce, by accessing deeper water sources. We conclude that beech and Douglas fir may equally coexist, while beech presence exacerbates the drought exposure of spruce.

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来源期刊
Plant Biology
Plant Biology 生物-植物科学
CiteScore
8.20
自引率
2.60%
发文量
109
审稿时长
3 months
期刊介绍: Plant Biology is an international journal of broad scope bringing together the different subdisciplines, such as physiology, molecular biology, cell biology, development, genetics, systematics, ecology, evolution, ecophysiology, plant-microbe interactions, and mycology. Plant Biology publishes original problem-oriented full-length research papers, short research papers, and review articles. Discussion of hot topics and provocative opinion articles are published under the heading Acute Views. From a multidisciplinary perspective, Plant Biology will provide a platform for publication, information and debate, encompassing all areas which fall within the scope of plant science.
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