Inverse determination of heterotrophic soil respiration response to temperature and water content under field conditions

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*Title:*	Main Title: Inverse determination of heterotrophic soil respiration response to temperature and water content under field conditions
*Description:*	Abstract: Heterotrophic soil respiration is an important flux within the global carbon cycle. Exact knowledge of the response functions for soil temperature and soil water content is crucial for a reliable prediction of soil carbon turnover. The classical approach for the in situ determination of the temperature response (Q10 or activation energy) from a linear regression between log-transformed CO2 fluxes and temperatures measured in a definite soil depth has been criticised for neglecting confounding factors such as spatial and temporal changes in soil water content and soil organic matter. To overcome these limitations, we determined temperature and soil water content response equations of heterotrophic soil respiration by means of inverse parameter estimation using a 1-dimensional CO2 transport and carbon turnover model. For the validation of the model we used an annual dataset of measured soil temperatures, soil water contents, and CO2 fluxes. Carbon pools were initialised using measured soil carbon fractions. Analysis of different formulations of temperature response resulted in estimated response factors that hardly deviated over the entire range of soil water contents and for temperatures < 25°C. For higher temperatures the temperature response was highly uncertain due to the infrequent occurrence of soil temperatures > 25°C. Inverse parameter estimation using numerical models is a promising tool for a reliable determination of the temperature and soil water content response of heterotrophic soil respiration.
*Identifier:*	10.1007/s10533-011-9583-1 (DOI)

Responsible Party

*Creators:*	Jana Bauer (Author), Lutz Weihermüller (Author), Johan A. Huisman (Author), Michael Herbst (Author), Alexander Graf (Author), Jean-Marie Sequaris (Author), Harry Vereecken (Author)
*Publisher:*	Springer
*Publication Year:*	2013

Topic

*TR32 Topic:*	Soil
*Related Subproject:*	Z3
*Subjects:*	Keywords: Soil Respiration, Heterotrophic Respiration, Water Content, Inverse Parameter Estimation

File Details

*Filename:*	2010_Bauer_Biogeochemistry.pdf
*Data Type:*	Text - Article
*Size:*	16 Pages
*File Size:*	676 KB
*Dates:*	Accepted: 11.02.2011 Issued: 08.03.2011
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	For internal use only
*Access Limitations:*	For internal use only
*Licence:*	[TR32DB] Data policy agreement

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*Publication Status:*	Published
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Biogeochemistry
*Issue:*	1-3
*Volume:*	108
*Number of Pages:*	16 (119 - 134)

Metadata Details

*Metadata Creator:*	Johann Alexander (Sander) Huisman
*Metadata Created:*	03.12.2013
*Metadata Last Updated:*	03.12.2013
*Subproject:*	Z3
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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