Details
| Original language | English |
|---|---|
| Article number | e2024 |
| Journal | ECOHYDROLOGY |
| Volume | 11 |
| Issue number | 6 |
| Publication status | Published - 21 Sept 2018 |
Abstract
By applying the newly developed flow cell (FC) concept, this study investigated the impact of small-scale spatial variations (millimetre to centimetre) in organic matter (OM) composition (diffusive reflectance infrared Fourier transform spectroscopy), biological activity (zymography), and wettability (contact angle [CA]) on transport processes (tracer experiments, radiography). Experiments were conducted in five undisturbed soil slices (millimetre apart), consisting of a sandy matrix with an embedded loamy band. In the loamy band increased enzyme activities and OM (10 mm apart) were found compared with the sand matrix, with no interrelations although spatial autocorrelation ranges were up to 7 cm. CAs were increased (0–110°) above the loamy band and were negatively correlated with acid phosphatase. Missing correlations were probably attributed to texture variations between soil slices. A general correlation between CA and C content (bulk) were confirmed. Variability in texture and hydraulic properties led to the formation of heterogeneous flow patterns and probably to heterogeneously distributed interfacial properties. The new FC concept allows process evaluation on the millimetre scale to analyse spatial relations, that is, between small-scale textural changes on transport processes and biological responses. The concept has been proved as a versatile tool to analyse spatial distribution of biological and interfacial soil properties in conjunction with the analysis of complex micro-hydraulic processes for undisturbed soil samples. The concept may be improved by additional nondestructive imaging methods, which is especially challenging for the detection of small-scale textural changes.
Keywords
- DRIFT spectroscopy, X-ray radiography, extracellular enzyme activity, flow cell, soil water repellency, transport processes, undisturbed soil
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Ecology, Evolution, Behavior and Systematics
- Agricultural and Biological Sciences(all)
- Aquatic Science
- Environmental Science(all)
- Ecology
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
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In: ECOHYDROLOGY, Vol. 11, No. 6, e2024, 21.09.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Coupling of interfacial soil properties and bio-hydrological processes
T2 - The Flow Cell Concept
AU - Krueger, Jiem
AU - Heitkötter, Julian
AU - Leue, Martin
AU - Schlüter, Steffen
AU - Vogel, Hans-Jörg
AU - Marschner, Bernd
AU - Bachmann, Jörg
N1 - Funding information: The authors like to thank the Deutsche Forschungsgemeinschaft DFG for financial support within the Research Group “SUBSOM”, BA1359/ 604212. We like to thank Martin Volkmann for his technical support during FC construction and Dr. John Maximilian Köhne (Soil Physics Department, UFZ?Halle) for his technical support during radiographical measurements. Also we like to thank Susanne K. Woche for XPS and CA analysis. The authors like to thank the Deutsche Forschungsgemeinschaft DFG for financial support within the Research Group ?SUBSOM?, BA1359/604212. We like to thank Martin Volkmann for his technical support during FC construction and Dr. John Maximilian K?hne (Soil Physics Department, UFZ-Halle) for his technical support during radiographical measurements. Also we like to thank Susanne K. Woche for XPS and CA analysis.
PY - 2018/9/21
Y1 - 2018/9/21
N2 - By applying the newly developed flow cell (FC) concept, this study investigated the impact of small-scale spatial variations (millimetre to centimetre) in organic matter (OM) composition (diffusive reflectance infrared Fourier transform spectroscopy), biological activity (zymography), and wettability (contact angle [CA]) on transport processes (tracer experiments, radiography). Experiments were conducted in five undisturbed soil slices (millimetre apart), consisting of a sandy matrix with an embedded loamy band. In the loamy band increased enzyme activities and OM (10 mm apart) were found compared with the sand matrix, with no interrelations although spatial autocorrelation ranges were up to 7 cm. CAs were increased (0–110°) above the loamy band and were negatively correlated with acid phosphatase. Missing correlations were probably attributed to texture variations between soil slices. A general correlation between CA and C content (bulk) were confirmed. Variability in texture and hydraulic properties led to the formation of heterogeneous flow patterns and probably to heterogeneously distributed interfacial properties. The new FC concept allows process evaluation on the millimetre scale to analyse spatial relations, that is, between small-scale textural changes on transport processes and biological responses. The concept has been proved as a versatile tool to analyse spatial distribution of biological and interfacial soil properties in conjunction with the analysis of complex micro-hydraulic processes for undisturbed soil samples. The concept may be improved by additional nondestructive imaging methods, which is especially challenging for the detection of small-scale textural changes.
AB - By applying the newly developed flow cell (FC) concept, this study investigated the impact of small-scale spatial variations (millimetre to centimetre) in organic matter (OM) composition (diffusive reflectance infrared Fourier transform spectroscopy), biological activity (zymography), and wettability (contact angle [CA]) on transport processes (tracer experiments, radiography). Experiments were conducted in five undisturbed soil slices (millimetre apart), consisting of a sandy matrix with an embedded loamy band. In the loamy band increased enzyme activities and OM (10 mm apart) were found compared with the sand matrix, with no interrelations although spatial autocorrelation ranges were up to 7 cm. CAs were increased (0–110°) above the loamy band and were negatively correlated with acid phosphatase. Missing correlations were probably attributed to texture variations between soil slices. A general correlation between CA and C content (bulk) were confirmed. Variability in texture and hydraulic properties led to the formation of heterogeneous flow patterns and probably to heterogeneously distributed interfacial properties. The new FC concept allows process evaluation on the millimetre scale to analyse spatial relations, that is, between small-scale textural changes on transport processes and biological responses. The concept has been proved as a versatile tool to analyse spatial distribution of biological and interfacial soil properties in conjunction with the analysis of complex micro-hydraulic processes for undisturbed soil samples. The concept may be improved by additional nondestructive imaging methods, which is especially challenging for the detection of small-scale textural changes.
KW - DRIFT spectroscopy
KW - X-ray radiography
KW - extracellular enzyme activity
KW - flow cell
KW - soil water repellency
KW - transport processes
KW - undisturbed soil
UR - http://www.scopus.com/inward/record.url?scp=85052381798&partnerID=8YFLogxK
U2 - 10.1002/eco.2024
DO - 10.1002/eco.2024
M3 - Article
VL - 11
JO - ECOHYDROLOGY
JF - ECOHYDROLOGY
SN - 1936-0584
IS - 6
M1 - e2024
ER -