Forest plant indicator values for moisture reflect atmospheric vapour pressure deficit rather than soil water content.

IF 9.4 1区 生物学 Q1 Agricultural and Biological Sciences New Phytologist Pub Date : 2024-12-01 Epub Date: 2024-08-22 DOI:10.1111/nph.20068
Martin Kopecký, Lucia Hederová, Martin Macek, Tereza Klinerová, Jan Wild
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Abstract

Soil moisture shapes ecological patterns and processes, but it is difficult to continuously measure soil moisture variability across the landscape. To overcome these limitations, soil moisture is often bioindicated using community-weighted means of the Ellenberg indicator values of vascular plant species. However, the ecology and distribution of plant species reflect soil water supply as well as atmospheric water demand. Therefore, we hypothesized that Ellenberg moisture values can also reflect atmospheric water demand expressed as a vapour pressure deficit (VPD). To test this hypothesis, we disentangled the relationships among soil water content, atmospheric vapour pressure deficit, and Ellenberg moisture values in the understory plant communities of temperate broadleaved forests in central Europe. Ellenberg moisture values reflected atmospheric VPD rather than soil water content consistently across local, landscape, and regional spatial scales, regardless of vegetation plot size, depth as well as method of soil moisture measurement. Using in situ microclimate measurements, we discovered that forest plant indicator values for moisture reflect an atmospheric VPD rather than soil water content. Many ecological patterns and processes correlated with Ellenberg moisture values and previously attributed to soil water supply are thus more likely driven by atmospheric water demand.

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森林植物水分指标值反映的是大气蒸汽压力不足,而不是土壤含水量。
土壤湿度影响着生态模式和生态过程,但很难连续测量整个地形的土壤湿度变化。为了克服这些限制,通常使用维管植物物种的艾伦伯格指标值的群落加权平均值对土壤水分进行生物指示。然而,植物物种的生态和分布反映了土壤水分供应以及大气对水分的需求。因此,我们假设艾伦伯格水分值也能反映以蒸汽压力不足(VPD)表示的大气需水量。为了验证这一假设,我们对欧洲中部温带阔叶林林下植物群落的土壤含水量、大气蒸气压差和艾伦伯格水分值之间的关系进行了分析。在局部、景观和区域空间尺度上,无论植被小区的大小、深度以及土壤水分测量方法如何,艾伦伯格水分值都一致地反映了大气蒸气压差而非土壤含水量。通过现场微气候测量,我们发现森林植物的水分指标值反映的是大气VPD而非土壤含水量。因此,许多与艾伦伯格湿度值相关的生态模式和过程(以前认为是土壤水分供应)更有可能是由大气需水量驱动的。
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来源期刊
New Phytologist
New Phytologist PLANT SCIENCES-
CiteScore
17.60
自引率
5.30%
发文量
728
审稿时长
1 months
期刊介绍: New Phytologist is a leading publication that showcases exceptional and groundbreaking research in plant science and its practical applications. With a focus on five distinct sections - Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology - the journal covers a wide array of topics ranging from cellular processes to the impact of global environmental changes. We encourage the use of interdisciplinary approaches, and our content is structured to reflect this. Our journal acknowledges the diverse techniques employed in plant science, including molecular and cell biology, functional genomics, modeling, and system-based approaches, across various subfields.
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