Discovering the importance of lateral CO2 transport from a temperate spruce 
forest

Fiedler, S.; Höll, B. S.; Jungkunst, H. F.

doi:10.1016/j.scitotenv.2006.03.038

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Discovering the importance of lateral CO₂ transport from a temperate spruce forest

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Jungkunst, H. F.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Fiedler, S., Höll, B. S., & Jungkunst, H. F. (2006). Discovering the importance of lateral CO₂ transport from a temperate spruce forest. Science of the Total Environment, 368(2-3), 909-915. doi:10.1016/j.scitotenv.2006.03.038.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-D40D-2

Abstract

Our study investigated the concentration of dissolved carbon at the point when water leaves the pedosphere and whether this amount represents a significant proportion of terrestrial carbon cycling. The investigations were carried out in a temperate forest catchment (Black Forest, Germany) over a period of I year. The annual export of dissolved C compounds (14.4 g C m(-2) year I) was dominated by CO₂ (9.7 vs. 4.7 g C m(-2) year(-1) DOC). Even though the direct CO₂ degassing at the spring was inferior (0.4 kg C year(-1)), considerably lower CO₂ concentrations were measured 17 m downstream of the spring. This shows that a large proportion of dissolved CO₂ (93%) originating from the pedosphere is not captured anymore within a short distance from the spring. The measured lateral C-transport was in the same order of magnitude as reported for the net ecosystem exchange (NEE) observed for German spruce forests (-4 to -55 g C m(-2) year(-1)). Therefore, the results clearly demonstrated that the lateral transport of dissolved carbon can be a significant part of terrestrial carbon budgets and for this study site CO₂ was dominating this 'indirect' pathway. However, for generalisation, it is important to extend this investigation to other landscapes and climatic zones. (c) 2006 Elsevier B.V All rights reserved. [References: 30]