Measurement depth effects on the apparent temperature sensitivity of soil respiration in field studies

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Title:Main Title: Measurement depth effects on the apparent temperature sensitivity of soil respiration in field studies
Description:Abstract: CO2 efflux at the soil surface is the result of respiration in different depths that are subjected to variable temperatures at the same time. Therefore, the temperature measurement depth affects the apparent temperature sensitivity of field-measured soil respiration. We summarize existing literature evidence on the importance of this effect, and describe a simple model to understand and estimate the magnitude of this potential error source for heterotrophic respiration. The model is tested against field measurements. We discuss the influence of climate (annual and daily temperature amplitude), soil properties (vertical distribution of CO2 sources, thermal and gas diffusivity), and measurement schedule (frequency, study duration, and time averaging). Q10 as a commonly used parameter describing the temperature sensitivity of soil respiration is taken as an example and computed for different combinations of the above conditions. We define conditions and data acquisition and analysis strategies that lead to lower errors in field-based Q10 determination. It was found that commonly used temperature measurement depths are likely to result in an underestimation of temperature sensitivity in field experiments. Our results also apply to activation energy as an alternative temperature sensitivity parameter.
Identifier:10.5194/bg-5-1175-2008 (DOI)
Responsible Party
Creators:Alexander Graf (Author), Lutz Weihermüller (Author), Johan A. Huisman (Author), Michael Herbst (Author), Jana Bauer (Author), Harry Vereecken (Author)
Publisher:European Geosciences Union
Publication Year:2013
Topic
TR32 Topic:Soil
Related Subproject:B1
Subjects:Keywords: Temperature, Temperature Sensitivity, CO2 Flux
File Details
Filename:2008_Graf_Biogeosciences.pdf
Data Type:Text - Article
Size:14 Pages
File Size:879 KB
Dates:Accepted: 29.07.2008
Issued: 26.08.2008
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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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Biogeosciences
Source Website:www.biogeosciences.net
Volume:5
Number of Pages:14 (1175 - 1188)
Metadata Details
Metadata Creator:Alexander Graf
Metadata Created:02.12.2013
Metadata Last Updated:02.12.2013
Subproject:B1
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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