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首页> 外文期刊>International journal of ecohydrology and hydrobiology >Hydraulic redistribution driven by roots: Modeling and simulation case for the Pantanal
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Hydraulic redistribution driven by roots: Modeling and simulation case for the Pantanal

机译：由根驱动的液压再分配：爪子的建模和模拟案例

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摘要

Evapotranspiration is the major component of the water cycle excluding precipitation. Evapotranspiration sub-processes represent important paths of water which have been poorly investigated and may play an important role in the water cycle. Two of these sub-processes are root water uptake (RWU) and root hydraulic redistribution (RHR), which were modelled and numerically explored in this study. Both RWU and RHR were evaluated using the source/sink term in Richards' equation coupled to a vegetation-atmosphere system. This coupling composes a model of water transfer in which the interplay between evapotranspiration and three different root density distributions (exponential, linear and constant scenarios) was simulated to understand, mainly, the influence of rooting systems on RWU and RHR. The results showed that the model consistently described the water dynamics and accurately estimated water fluxes, with evapotranspiration and RWU greater under the constant scenario. RHR contributed, from simulations, up to 21% of the evapotranspiration on a daily basis. Precipitation events may invert the direction of RHR from upward (hydraulic lift) to downward. The last process tends to conserve soil moisture in the root zone. The root systems modified the dynamics of the drainage, being the exponential scenario the greatest contributor to free drainage. (C) 2020 European Regional Centre for Ecohydrology of the Polish Academy of Sciences. Published by Elsevier B.V. All rights reserved.
机译：蒸散是除沉淀的水循环的主要成分。蒸散蒸腾子过程代表了对较差的水的重要途径，并且可能在水循环中发挥重要作用。这些子过程中的两种是根水摄取（RWU）和根液压再分配（RHR），在本研究中被建模和数值探索。 RWU和RHR都使用Richards的等式中的源/沉降术语进行评估，耦合到植被 - 大气系统。该耦合组成了一种水转移模型，其中模拟了蒸散散热物和三种不同的根浓度分布（指数，线性和恒定场景）之间的相互作用以理解，主要是生根系统对RWU和RHR的影响。结果表明，该模型始终如一地描述了水动力学和准确估计的水通量，在恒定场景下具有蒸散散热和RWU更大。 RHR从仿真贡献，每天高达21％的蒸散量。降水事件可以将RHR的方向从向上（液压升降机）向下颠倒。最后一个过程倾向于保护根部区域的土壤水分。根系系统修改了排水的动态，是指数方案最大的自由排水的贡献者。 （c）2020年欧洲区域科学科学院生态学学中心。 elsevier b.v出版。保留所有权利。

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