[1124] - Spatial controls on heterotrophic respiration in a temperate grassland

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Schiedung, H., 2014. Spatial controls on heterotrophic respiration in a temperate grassland. PhD Report, Institute of Crop Science and Resource Conservation, Soil Science and Soil Ecology, Nussallee 13, University of Bonn, 53115 Bonn, Germany, Bonn, Germany. Accessed from https://www.tr32db.uni-koeln.de/data.php?dataID=1124 at 2019-08-20.
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Title(s):Main Title: Spatial controls on heterotrophic respiration in a temperate grassland
Description(s):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(s):Author: Henning Schiedung
Publisher:CRC/TR32 Database (TR32DB)
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: Soil CO2 efflux, Soil Organic Matter, Spatial Variability, Spatial Heterogeneity
File Details
File Name:Paper Draft.docx
Data Type:Text
File Size:171 kB (0.167 MB)
Date(s):Date Submitted: 2014-12-19
Mime Type:application/vnd.openxmlformats-officedocument.wordprocessingml.document
Data Format:MS word
Download Permission:OnlyTR32
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
Measurement Region:Kall
Measurement Location:Rollesbroich
Specific Informations - Report
Report Date:24th of December, 2014
Report Type:PhD Report
Report City:Bonn, Germany
Report Institution:Institute of Crop Science and Resource Conservation, Soil Science and Soil Ecology, Nussallee 13, University of Bonn, 53115 Bonn, Germany
Number Of Pages:32
Period of Pages:1 - 32
Further Informations:Paper draft
Metadata Details
Metadata Creator:Henning Schiedung
Metadata Created:2014-12-24
Metadata Last Updated:2014-12-24
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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