[653] - Multistep outflow experiments to determine soil physical and carbon dioxide production parameters

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Weihermüller, L., Huisman, J. A., Herbst, M., Graf, A., Sequaris, J., 2009. Multistep outflow experiments to determine soil physical and carbon dioxide production parameters. Vadose Zone Journal, 8 (3), 772 - 782. DOI: 10.2136/vzj2008.0041.
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Title(s):Main Title: Multistep outflow experiments to determine soil physical and carbon dioxide production parameters
Description(s):Abstract: Soil water content (SWC) plays a crucial role in the production and transport of CO2 in soils. Classical approaches estimating the effects of SWC on soil respiration are incubation experiments, where soil structure is disturbed and transport processes are neglected. Nevertheless, such data govern the water reduction function of C turnover models. In our approach, the water reduction control parameters (WRCP) of a water reduction function were estimated from column experiments using inverse modeling. Therefore, we used the SOILCO2–RothC model in combination with multistep outflow (MSO) experiments. First, the effective hydraulic properties were estimated and then used in a second experiment to estimate the WRCP and rate constants of the resistant plant material (RPM) C pool. The results showed that the estimated hydraulic parameters can be used for the prediction of CO2 production and transport of a second MSO experiment only if the WRCP and the C turnover rate of the RPM pool of RothC will also be optimized. Optimizing only the WRCP matched the CO2 efflux fairly well but the WRCP at the highest matric potential, which determines the start of reduction, was too low at −1.61 cm and (water-filled pore space [WFPS] = 99.9%). Calibrating both WRCP and the RPM rate constant matched the efflux again fairly well and the results indicate a reduction of optimal CO2 production at water contents of 0.224 m3 m−3 or 53.3% WFPS. Also, the estimated RPM rate constant seems to be in a reasonable range at k RPM = 2.5791 × 10−7 cm−1.
Identifier(s):DOI: 10.2136/vzj2008.0041
Responsible Party
Creator(s):Author: Lutz Weihermüller
Author: Johan A. Huisman
Author: Michael Herbst
Author: Alexander Graf
Author: Jean-Marie Sequaris
Publisher:Soil Science Society of America
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: CO2, Soil Water Content, CO2 Flux
File Details
File Name:2009_Weihermueller_VZJ.pdf
Data Type:Text
Size(s):11 Pages
File Size:1302 kB (1.271 MB)
Date(s):Issued: 2009-08-01
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Publication
Article Type:Journal
Source:Vadose Zone Journal
Number Of Pages:11
Page Range:772 - 782
Metadata Details
Metadata Creator:Johann Alexander (Sander) Huisman
Metadata Created:2013-12-02
Metadata Last Updated:2013-12-02
Funding Phase:1
Metadata Language:English
Metadata Version:V40
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