This title appears in the Scientific Report :
2007
Please use the identifier:
http://dx.doi.org/10.2134/jeq2006.0368 in citations.
Dissolved organic fluxes under bare soil
Dissolved organic fluxes under bare soil
The flux of dissolved organic carbon (DOC) in soil facilitates transport of nutrients and contaminants in soil. There is little information on DOC fluxes and the relationship between DOC concentration and water flux in agricultural soils. The DOC fluxes and concentrations were measured during 2.5 yr...
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Personal Name(s): | Mertens, J. |
---|---|
Vanderborght, J. / Kasteel, R. / Pütz, T. / Merckx, R. / Feyen, J. / Smolders, E. | |
Contributing Institute: |
Agrosphäre; ICG-4 |
Published in: | Journal of environmental quality, 36 (2007) S. 597 - 606 |
Imprint: |
Madison, Wis.
ASA [u.a.]
2007
|
Physical Description: |
597 - 606 |
PubMed ID: |
17332264 |
DOI: |
10.2134/jeq2006.0368 |
Document Type: |
Journal Article |
Research Program: |
Terrestrische Umwelt |
Series Title: |
Journal of Environmental Quality
36 |
Subject (ZB): | |
Publikationsportal JuSER |
The flux of dissolved organic carbon (DOC) in soil facilitates transport of nutrients and contaminants in soil. There is little information on DOC fluxes and the relationship between DOC concentration and water flux in agricultural soils. The DOC fluxes and concentrations were measured during 2.5 yr using 30 automatic equilibrium tension plate lysimeters (AETPLs) at 0.4 m and 30 AETPLs at 1.20-m depth in a bare luvisol, previously used as an arable soil. Average annual DOC fluxes of the 30 AETPLS were 4.9 g C m(-2) y(-1) at 0.4 m and 2.4 g C m(-2) y(-1) at 1.2 m depth. The average leachate DOC concentrations were 17 mg C L(-1) (0.4 m) and 9 mg C L(-1) (1.2 m). The DOC concentrations were unrelated to soil moisture content or average temperature and rarely dropped below 9 mg C L(-1) (0.4 m) and 5 mg C L(-1) (1.2 m). The variability in cumulative DOC fluxes among the plates was positively related to leachate volume and not to average DOC concentrations at both depths. This suggests that water fluxes are the main determinants of spatial variability in DOC fluxes. However, the largest DOC concentrations were inversely proportional to the mean water velocity between succeeding sampling periods, suggesting that the maximal net DOC mobilization rate in the topsoil is limited. Elevated DOC concentrations, up to 90 mg C L(-1), were only observed at low water velocities, reducing the risks of DOC-facilitated transport of contaminants to groundwater. The study emphasizes that water flux and velocity are important parameters for DOC fluxes and concentrations. |