The Temperature Sensitivity (Q10) of Soil Respiration: Controlling Factors and Spatial Prediction at Regional Scale Based on Environmental Soil Classes

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Title:Main Title: The Temperature Sensitivity (Q10) of Soil Respiration: Controlling Factors and Spatial Prediction at Regional Scale Based on Environmental Soil Classes
Description:Abstract: The temperature sensitivity of heterotrophic soil respiration is crucial for modeling carbon dynamics but it is variable. Presently, however, most models employ a fixed value of 1.5 or 2.0 for the increase of soil respiration per 10°C increase in temperature (Q10). Here we identified the variability of Q10 at a regional scale (Rur catchment, Germany/Belgium/Netherlands). We divided the study catchment into environmental soil classes (ESCs), which we define as unique combinations of land use, aggregated soil groups, and texture. We took nine soil samples from each ESC (108 samples) and incubated them at four soil moisture levels and five temperatures (5–25°C). We hypothesized that Q10 variability is controlled by soil organic carbon (SOC) degradability and soil moisture and that ESC can be used as a widely available proxy for Q10, owing to differences in SOC degradability. Measured Q10 values ranged from 1.2 to 2.8 and were correlated with indicators of SOC degradability (e.g., pH, r = -0.52). The effect of soil moisture on Q10 was variable: Q10 increased with moisture in croplands but decreased in forests. The ESC captured significant parts of Q10 variability under dry (R2 = 0.44) and intermediate (R2 = 0.36) moisture conditions, where Q10 increased in the order cropland
Identifier:10.1002/2017GB005644 (DOI)
Responsible Party
Creators:Nele Meyer (Author), Gerd Welp (Author), Wulf Amelung (Author)
Publisher:Wiley
Publication Year:2018
Topic
TR32 Topic:Soil
Related Subproject:B3
Subjects:Keywords: Soil Organic Matter, Soil Respiration, Soil Temperature
File Details
Filename:Meyer_2018_Global_Biogeochemical_Cycles.pdf
Data Type:Text - Article
File Size:4 MB
Date:Accepted: 09.02.2018
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:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:[TR32DB] Data policy agreement
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Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Global Biogeochemical Cycles
Issue:2
Volume:32
Number of Pages:18 (306 - 323)
Metadata Details
Metadata Creator:Nele Meyer
Metadata Created:26.02.2018
Metadata Last Updated:26.02.2018
Subproject:B3
Funding Phase:3
Metadata Language:English
Metadata Version:V50
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