Dynamic interactions between groundwater level and discharge by phreatophytes

IF 4 2区 环境科学与生态学 Q1 WATER RESOURCES
Cheng-Wei Huang , Jean-Christophe Domec , Thomas L. O’Halloran , Samantha Hartzell
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Abstract

Many traditional models that predict plant–groundwater use based on groundwater level variations, such as the White method, make various simplifying assumptions. For example, these models often neglect the role of plant hydraulic redistribution, a process that can contribute up to 80% of transpiration. Thus, this work aims to avoid such assumptions and subsequently explore the dynamic interactions between groundwater levels and phreatophytic vegetation, including plant nocturnal transpiration, hydraulic redistribution, and response to atmospheric conditions, in shallow-groundwater ecosystems using Loblolly pine (Pinus taeda) as a model species. The model scenarios are formulated using a stomatal-optimization model coupled to the soil–plant–atmosphere continuum. Flow through soil and groundwater are described using the Richards equation and a linear reservoir approximation, respectively, with groundwater in contact with an external water body of fixed elevation. Results show that nocturnal transpiration, mediated by plant residual conductance, and hydraulic redistribution, are able to reduce groundwater levels at night and alter the groundwater recharge rate. Projected atmospheric conditions of increased carbon dioxide and elevated temperature have opposing effects on groundwater levels, which tend to roughly cancel each other under a projected scenario of 500 ppm carbon dioxide and 1.5 oC warming. Such detailed modeling can be used to provide further insights into coupled interactions between vegetation, climate and groundwater levels in phreatophyte-dominated ecosystems.

地下水位与蕨类植物排水量之间的动态相互作用
许多基于地下水位变化预测植物地下水使用量的传统模型(如怀特法)都做了各种简化假设。例如,这些模型往往忽略了植物水力再分配的作用,而这一过程可能占蒸腾作用的 80%。因此,这项工作旨在避免这些假设,并随后探索浅层地下水生态系统中地下水位与植被之间的动态相互作用,包括植物夜间蒸腾作用、水力再分配以及对大气条件的响应,并以欧洲赤松(Pinus taeda)为模型物种。模型方案是利用与土壤-植物-大气连续体耦合的气孔优化模型制定的。流经土壤和地下水的水流分别使用理查兹方程和线性水库近似法进行描述,地下水与固定海拔的外部水体接触。结果表明,夜间蒸腾作用、植物残留传导和水力再分配能够降低夜间地下水位,并改变地下水补给率。预计大气中二氧化碳增加和气温升高对地下水位的影响是相反的,在预计二氧化碳浓度为 500 ppm、气温升高 1.5 oC 的情况下,这两种影响大致相互抵消。这种详细的建模可用于进一步了解以岩浆植物为主的生态系统中植被、气候和地下水位之间的耦合相互作用。
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来源期刊
Advances in Water Resources
Advances in Water Resources 环境科学-水资源
CiteScore
9.40
自引率
6.40%
发文量
171
审稿时长
36 days
期刊介绍: Advances in Water Resources provides a forum for the presentation of fundamental scientific advances in the understanding of water resources systems. The scope of Advances in Water Resources includes any combination of theoretical, computational, and experimental approaches used to advance fundamental understanding of surface or subsurface water resources systems or the interaction of these systems with the atmosphere, geosphere, biosphere, and human societies. Manuscripts involving case studies that do not attempt to reach broader conclusions, research on engineering design, applied hydraulics, or water quality and treatment, as well as applications of existing knowledge that do not advance fundamental understanding of hydrological processes, are not appropriate for Advances in Water Resources. Examples of appropriate topical areas that will be considered include the following: • Surface and subsurface hydrology • Hydrometeorology • Environmental fluid dynamics • Ecohydrology and ecohydrodynamics • Multiphase transport phenomena in porous media • Fluid flow and species transport and reaction processes
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