Impact of Lower Boundary Condition of Richards' Equation on Water, Energy, and Soil Carbon Based on Coupling Land Surface and Biogeochemical Models

CHEN Xiangdong; Xu LIANG; XIA Jun; SHE Dunxian

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Impact of Lower Boundary Condition of Richards' Equation on Water, Energy, and Soil Carbon Based on Coupling Land Surface and Biogeochemical Models

机译：基于耦合地表和生物地球化学模型的Richards方程下界条件对水，能量和土壤碳的影响

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Soil moisture has a significant influence on water,energy,and carbon biogeochemical cycles.A numerical method for solving Richards' equation is usually used for simulating soil moisture.Selection of a lower boundary condition for Richards' equation will further affect the simulation results for soil moisture,water cycle,energy balance,and carbon biogeochemical processes.In this study,the soil water movement dynamic sub-model of a hydrologically based land surface model,the variable infiltration capacity (VIC)model,was modified using the finite difference method (FDM) to solve a mixed form of Richards' equation.In addition,the VIC model was coupled with a terrestrial biogeochemical model,the Carnegie Ames Stanford Approach model of carbon,nitrogen,and phosphorus (CASACNP model).The no-flux boundary (NB) and free-drainage boundary (FB) were selected to investigate their impacts on simulations of the water,energy,and soil carbon cycles based on the coupling model.The NB and FB had different influences on the water,energy,and soil carbon simulations.The water and energy simulations were more sensitive,while the soil carbon simulation was less sensitive to FB than to NB.Free-drainage boundary could result in lower soil moisture,evaporation,runoff,and heterotrophic respiration and higher surface soil temperature,sensible heat flux,and soil carbon content.The impact of the lower boundary condition on simulation would be greater with an increase in soil permeability.In the silt loam soil case,evaporation,runoff,and soil respiration of FB were nearly 16％,13％,and 1％ smaller,respectively,compared to those of NB.

机译：土壤水分对水，能量和碳生物地球化学循环有重大影响。通常使用数值方法求解Richards方程来模拟土壤水分。选择Richards方程的下边界条件将进一步影响土壤的模拟结果这项研究中，使用有限差分法对基于水文的陆面模型的土壤水分运动动态子模型，可变渗透能力（VIC）模型进行了修正（ FDM）来求解Richards方程的混合形式。此外，VIC模型与陆地生物地球化学模型，Carnegie Ames Stanford方法碳，氮和磷的模型（CASACNP模型）耦合。无通量边界（基于耦合模型，选择NB）和自由排水边界（FB）来研究它们对水，能量和土壤碳循环模拟的影响。 nt对水，能源和土壤碳模拟的影响。水和能源模拟更为敏感，而土壤碳模拟对FB的敏感性低于对NB的敏感性。自由排水边界可能导致较低的土壤水分，蒸发，径流，异养呼吸，较高的地表土壤温度，显热通量和土壤碳含量。随着土壤渗透性的增加，下边界条件对模拟的影响会更大。在粉壤土的土壤情况下，蒸发，径流和与NB相比，FB的土壤呼吸分别接近16％，13％和1％。

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《土壤圈（英文版）》 |2018年第3期|497-510|共14页
作者
CHEN Xiangdong; Xu LIANG; XIA Jun; SHE Dunxian;
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作者单位

China Institute of Water Resources and Hydropower Research, Beijing 100036(China);

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100036(China);

Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh 15261(USA);

State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072(China);

State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072(China);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 eng
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Impact of Lower Boundary Condition of Richards' Equation on Water, Energy, and Soil Carbon Based on Coupling Land Surface and Biogeochemical Models

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