Spatial controls on heterotrophic respiration in a temperate grassland

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Title:Main Title: Spatial controls on heterotrophic respiration in a temperate grassland
Description:Abstract: Lacking knowledge about the spatial heterogeneity of heterotrophic soil respiration (Rh) and of its controlling factors in patchy landscapes hampers the prediction of larger-scale soil CO2 efflux under changing temperature and moisture regimes. The aim of this study was i) to establish a cost-efficient method for the rapid assessment of cumulative heterotrophic soil respiration (CO2), both ex- (eRh) and in-situ (iRh), and ii) to analyze their variability affected by changing soil properties of a temperate grassland. The eRh was assessed via automated long-term (120 days) incubations at 22°C and 50% water holding capacity (WHC) using a Respicond VIII respirometer. Parts of this equipment were then transferred to field conditions for comparative assessment of iRh, which was additionally assessed in parallel using infrared gas analyzers. As potential controls on respiration, soil texture, soil organic carbon (SOC) content, soil total nitrogen, as well as WHC were determined by a combination of conventional lab analyses and predictions via mid-infrared spectroscopy and partial least square regression analyses (MIRS-PLSR). The results showed good agreement between iRh measurements from the Respicond field adaptations and infrared analyses (Slope=0.92, R²=0.99). The overall CO2 release (eRh) was about 50% for higher Stagnosols than for Cambisols. Yet, only the Cambisols exhibited a temperature-controlled relationship between eRh and iRh, whereas this relationship was absent in the Stagnosols. Hence, spatial variability of soil respiration was related to soil unit. Across soil units, eRh was exponentially related to SOC concentrations (R² = 0.78) and to WHC (R²=0.87), while soil texture affected neither eRh nor iRh. We suggest that WHC and soil unit are promising scaling parameters for heterotrophic respiration across ecosystems.
Responsible Party
Creator:Henning Schiedung (Author)
Publisher:CRC/TR32 Database (TR32DB)
Publication Year:2013
Topic
TR32 Topic:Soil
Related Subproject:B3
Subject:Keyword: PhD Report
File Details
Filename:Report2_Schiedung_2012.pdf
Data Type:Text - Text
File Size:9.6 MB
Date:Submitted: 19.12.2014
Mime Type:application/pdf
Data Format:MS word
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
Geographic
Specific Information - Report
Report Date:24th of December, 2014
Report Type:PhD Report
Report City:Bonn, Germany
Report Institution:Institute of Crop Science and Resource Conservation (INRES) - Division Soil Science, University Bonn
Volume:5
Number of Pages:28 (1 - 28)
Further Information:TR32 Student Report Phase II (Paper draft)
Metadata Details
Metadata Creator:Henning Schiedung
Metadata Created:04.12.2013
Metadata Last Updated:04.12.2013
Subproject:B3
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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