[1018] - Spatial and temporal variability of soil CO2 efflux in a spruce-dominated forest in the Eifel National Park, Germany

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Dwersteg, D., 2012. Spatial and temporal variability of soil CO2 efflux in a spruce-dominated forest in the Eifel National Park, Germany. University of Bonn, Bonn.
Title(s):Main Title: Spatial and temporal variability of soil CO2 efflux in a spruce-dominated forest in the Eifel National Park, Germany
Description(s):Abstract: The objective of this study was the analysis of temporal and spatial patterns of soil respiration on a catchment scale. This study is part of the DFG-financed project Transregio 32, which deals with the analysis of spatial and temporal patterns of matter fluxes on different scales. For investigation of local CO2-fluxes from soil a catchment area of 27 ha in a spruce stand of the Eifel National Park was chosen and 89 measurement points, placed along two transects and one measurement grid, were installed. Soil respiration was measured weekly using a closed-dynamic chamber system, along with soil temperature (in 5 and 11 cm depth) and soil moisture (integral of 15 cm) for each measurement point. Additionally soil samples for the characterization of soil structure, including texture, density, root distribution and organic matter content, were taken. In a first step the measured values were evaluated with regard to temporal and spatial patterns. These values were reproduced through a 1-dimensional simulation using a soil respiration model in a second step. The results of the measurements show that temperature plays an important role in the explanation of existing temporal patterns of soil respiration. Soil moisture exerts an influence on the temporal development of soil-CO2-fluxes, when extremely high or extremely low values of soil moisture are present. Spatial patterns are partly explained through the thickness of litter layer and through the distance from the next tree. The analysis of mean relative differences (MRD) proves satisfactory with regard to the identification of outliers and representative field averages. The application of the soil respiration model PATCIS (Fang & Moncrieff 1999) was helpful, as it resulted in a good accordance of simulated and measured values of soil CO2 efflux. The assumption, that temperature plays a major role in the variability of soil respiration, was verified by the model. Additionally the amount of organic matter in soil was identified as a second important factor explaining patterns in soil respiration. Since the measurement of soil organic matter involves a high effort and was therefore reduced to a minimum, the characterization of unsampled measurement points may be affected by large extrapolation errors, which in turn can be responsible for a high modelling error. Future investigations in the observed catchment area should involve a detailed spatial examination of different soil parameters, especially of soil organic matter, to further reduce possible errors in simulation.
Identifier(s):URL: http://hss.ulb.uni-bonn.de/2012/2823/2823.htm
Responsible Party
Creator(s):Author: Daniela Dwersteg
Publisher:University of Bonn
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: Soil CO2 efflux, Soil Moisture, Soil Temperature, Soil Respiration
Topic Category:Environment
File Details
File Name:Dwersteg 2012.pdf
Data Type:Text
File Size:8080 kB (7.891 MB)
Date(s):Available: 2012-02-28
Mime Type:application/pdf
Data Format:PDF
Download Permission:Free
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
North:-no map data
Measurement Region:Erkensruhr
Measurement Location:Wüstebach
Specific Informations - Publication
Metadata Details
Metadata Creator:Thomas Cornelissen
Metadata Created:2014-08-28
Metadata Last Updated:2014-08-28
Funding Phase:1
Metadata Language:English
Metadata Version:V40
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