Spatio-temporal variability of soil respiration in a spruce-dominated headwater catchment in western Germany
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| Title: | Main Title: Spatio-temporal variability of soil respiration in a spruce-dominated headwater catchment in western Germany |
| Description: | Abstract: CO2 production and transport from forest floors is an important component of the carbon cycle and is closely related to the global atmosphere CO2 concentration. If we are to understand the feedback between soil processes and atmospheric CO2, we need to know more about the spatiotemporal variability of this soil respiration under different environmental conditions. In this study, long-term measurements were conducted in a spruce-dominated forest ecosystem in western Germany. Multivariate analysis-based similarities between different measurement sites led to the detection of site clusters along two CO2 emission axes: (1) mainly controlled by soil temperature and moisture condition, and (2) mainly controlled by root biomass and the forest floor litter. The combined effects of soil temperature and soil moisture were used as a time-dependent rating factor affecting the optimal CO2 production and transport at cluster level. High/moderate/weak time-dependent rating factors were associated with the different clusters. The process-based, most distant clusters were identified using specified pattern characteristics: the reaction rates in the soil layers, the activation energy for bio-chemical reactions, the soil moisture dependency parameter, the root biomass factor, the litter layer factor and the organic matter factor. A HYDRUS-1D model system was inversely used to compute soil hydraulic parameters from soil moisture measurements. Heat transport parameters were calibrated based on observed soil temperatures. The results were used to adjust CO2 productions by soil microorganisms and plant roots under optimal conditions for each cluster. Although the uncertainty associated with the HYDRUS-1D simulations is higher, the results were consistent with both the multivariate clustering and the timedependent rating of site production. Finally, four clusters with significantly different environmental conditions (i.e. permanent high soil moisture condition, accumulated litter amount, high variability in soil moisture content, and dominant temperature dependence) were found to be relevant in explaining the spatio-temporal variability of CO2 efflux and providing reference-specific characteristic values for the investigated area. |
| Identifier: | 10.5194/bg-11-4235-2014 (DOI) |
Responsible Party
| Creators: | Aymar Bossa (Author), Bernd Diekkrüger (Author) |
| Publisher: | Copernicus Publications |
| Publication Year: | 2014 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | C1 |
| Subjects: | Keywords: Soil CO2 efflux, Soil Moisture, Soil Temperature, Soil Respiration |
File Details
| Filename: | Bossa & Diekkrueger 2014.pdf |
| Data Type: | Text - Article |
| Size: | 15 Pages |
| File Size: | 1 MB |
| Date: | Accepted: 03.07.2014 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| 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 |
| Volume: | 11 |
| Number of Pages: | 15 (4235 - 4249) |
Metadata Details
| Metadata Creator: | Thomas Cornelissen |
| Metadata Created: | 01.09.2014 |
| Metadata Last Updated: | 01.09.2014 |
| Subproject: | C1 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 924 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 2 |
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