浙江农业学报 ›› 2020, Vol. 32 ›› Issue (6): 1029-1038.DOI: 10.3969/j.issn.1004-1524.2020.06.11

• 环境科学 • 上一篇    下一篇

基于Maxwell-Stefan扩散模型的土壤碳通量计算方法研究

陈铭儒1, 胡军国1,*, 崔武峰1, 俞平2   

  1. 1.浙江农林大学 信息工程学院,浙江 杭州 311300;
    2.中共杭州市临安区委统一战线工作部,浙江 杭州 311300
  • 收稿日期:2019-11-08 出版日期:2020-06-25 发布日期:2020-06-24
  • 通讯作者: *胡军国,E-mail:hawkhjg@163.com
  • 作者简介:陈铭儒(1994—),男,北京人,硕士研究生,主要从事土壤生态环境研究。E-mail:1275697160@qq.com
  • 基金资助:
    国家自然科学基金(31570629)

Study on calculation method of soil carbon flux based on Maxwell-Stefan diffusion model

CHEN Mingru1, HU Junguo1,*, CUI Wufeng1, YU Ping2   

  1. 1. College of Information Engineering, Zhejiang A&F University, Hangzhou 311300, China;
    2. The United Front Work Department of the CPC HangZhou Lin'an District Committee, Hangzhou 311300, China
  • Received:2019-11-08 Online:2020-06-25 Published:2020-06-24

摘要: 目前土壤碳通量的监测方法存在一定的缺点,导致无法长时间精确监测。针对这一问题,提出用Maxwell-Stefan扩散模型进行碳通量的计算,并建立开放型气室模型进行仿真研究。根据仿真程序生成的不同高度的浓度时间序列,基于Maxwell-Stefan扩散模型计算二氧化碳通量值,将计算结果与仿真设定值进行对比。其中,设定通量为0.5 μmol·m-2·s-1时,计算结果为0.547 μmol·m-2·s-1;设定通量为1.0 μmol·m-2·s-1时,计算结果为0.969 μmol·m-2·s-1;设定通量为2.0 μmol·m-2·s-1时,计算结果为2.122 μmol·m-2·s-1。运用该算法计算的误差均在10%以内。另外,与Fick扩散模型的计算结果进行对比,在3组实验下,Maxwell-Stefan模型计算所得的通量值都更加接近于设定值。本研究的结果表明,Maxwell-Stefan扩散模型适用于土壤呼吸碳通量的计算,并且具有较好的计算结果,从理论上验证了该模型用于土壤碳通量计算的可行性和准确性。

关键词: 土壤呼吸, 扩散模型, 多组分, 碳通量

Abstract: There are certain disadvantages in the monitoring methods of soil carbon flux, which led to inability to accurately monitor for long period. To solve this problem, the present study proposed a method to calculate the carbon flux by using Maxwell-Stefan diffusion model, and establish an open-chamber in order for simulation. According to the multiple altitude of concentration, the carbon flux was calculated based on Maxwell-Stefan model, and was compared with the simulation settings. The calculated result was 0.547 μmol·m-2·s-1 when the set flux was 0.5μmol·m-2·s-1, the calculated result was 0.969 μmol·m-2·s-1 when the set flux was 1.0 μmol·m-2·s-1, and the calculated result was 2.122 μmol·m-2·s-1 when the set flux was 2.0 μmol·m-2·s-1. The error calculated by this method was less than 10%. In addition, compared with the calculation results of the Fick diffusion mode, the flux values calculated by the Maxwell-Stefan model were closer to the set values in three experiments. The experimental results proved that Maxwell-Stefan model was appropriate to calculate the carbon fluxes of soil respiration and it had favourable accuracy. The present study verified the feasibility and accuracy of the Maxwell-Stefan model in calculating soil carbon flux theoretically.

Key words: soil respiration, Maxwell-Stefan diffusion model, multicomponent, carbon flux

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