Computing the mean residence time of soil carbon fractions using stable isotopes: impacts of the model framework
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| Title: | Main Title: Computing the mean residence time of soil carbon fractions using stable isotopes: impacts of the model framework |
| Description: | Abstract: Soils contain the largest carbon (C) reservoir on Earth, but the duration of C storage in soil, i.e., its mean residence time (MRT), is often poorly estimated despite its importance for assessing the efficiency at which soils may serve as a sink for atmospheric C. The objective of this study was to evaluate how the structure of simple models on soil carbon dynamics affects the MRT determined from isotope-mixing experiments using data from field studies with either artificial labelling (FACE) or C3/C4 vegetation change. We first theoretically highlighted how non steady-state conditions and the model structure (one single, two successive, or two parallel C pools) can impact the MRT assessment. Then we tested these different model structures against published data on the dynamics of different soil organic matter separates (e.g., particle-size fractions) and their constituents (lipids, carbohydrates, lignins). Our findings pointed out that many of the reviewed studies wrongly assumed that their system was at steady state or could be described by a single-pool approach. To select the correct model, exact knowledge on C input rates and several data points are needed from the beginning of the experiment. For steady-state conditions, an apparent temporal change of MRT computed from a single-pool model is thus a clear indicator that a two-pool approach must be chosen. The errors made by the wrong model choice varied with the length of the experiment. They usually resulted in an overestimation of MRT, with a magnitude of 15% for some data published on physical size separates but with a factor of up to 11 for individual microbial biomarkers such as muramic acid. |
| Identifier: | 10.1111/j.1365-2389.2010.01333.x (DOI) |
Responsible Party
| Creators: | Delphine Derrien (Author), Wulf Amelung (Author) |
| Publisher: | British Society of Soil Science |
| Publication Year: | 2013 |
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File Details
| Filename: | 2011_Derrien_EJoSS.pdf |
| Data Type: | Text - Article |
| Size: | 51 Pages |
| File Size: | 1.1 MB |
| Date: | Accepted: 23.07.2010 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
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| 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: | European Journal of Soil Science |
| Issue: | 2 |
| Volume: | 62 |
| Number of Pages: | 16 (237 - 252) |
Metadata Details
| Metadata Creator: | Ludger Bornemann |
| Metadata Created: | 02.12.2013 |
| Metadata Last Updated: | 02.12.2013 |
| Subproject: | B3 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 885 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 2 |
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