Water and Dissolved Carbon Fluxes in an Eroding Soil Landscape Depending on Terrain Position

被引:31
|
作者
Rieckh, Helene [1 ]
Gerke, Horst H. [1 ]
Siemens, Jan [2 ]
Sommer, Michael [1 ,3 ]
机构
[1] Leibniz Ctr Agr Landscape Res ZALF, Inst Soil Landscape Res, Muncheberg, Germany
[2] Univ Bonn, Inst Crop Sci & Resource Conservat, Bonn, Germany
[3] Univ Potsdam, Inst Earth & Environm Sci, Potsdam, Germany
来源
VADOSE ZONE JOURNAL | 2014年 / 13卷 / 07期
关键词
ORGANIC-CARBON; SOLUTE TRANSPORT; HYDRAULIC CONDUCTIVITY; SUCTION CUPS; MODEL; FLOW; VARIABILITY; MACROPORES; PRINCIPLES; HORIZONS;
D O I
10.2136/vzj2013.10.0173
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Leaching of dissolved C in arable hummocky ground moraine soil landscapes is characterized by a spatial continuum of more or less erosion-affected Luvisols, Calcaric Regosols at exposed positions, and Colluvic Regosols in depressions. Our objective was to estimate the fluxes of dissolved C in four differently eroded soils as affected by erosion-induced pedological and soil structural alterations. In this model study, we considered landscape position effects by adapting the water table as the bottom boundary condition and erosion effects by using pedon-specific soil hydraulic properties. The one-dimensional vertical water movement was described with the Richards equation using HYDRUS-1D. Solute fluxes were obtained by combining calculated water fluxes with concentrations of dissolved organic and inorganic C (DOC and DIC, respectively) measured from soil solution extracted by suction cups at biweekly intervals. In the 3-yr period (2010-2012), DOC fluxes in the 2-m soil depth were similar at the three non-colluvic locations with -0.8 +/- 0.1 g m(-2) yr(-1) (i.e., outflow) but were 0.4 g m(-2) yr(-1) (i.e., input) in the depression. The DIC fluxes ranged from -10.2 g m(-2) yr(-1) for the eroded Luvisol, -9.2 g m(-2) yr(-1) for the Luvisol, and -6.1 g m(-2) yr(-1) for the Calcaric Regosol to 3.2 g m(-2) yr(-1) for the Colluvic Regosol. The temporal variations in DOC and DIC fluxes were controlled by water fluxes. The spatially distributed leaching results corroborate the hypothesis that the effects of soil erosion influence fluxes through modified hydraulic and transport properties and terrain-dependent boundary conditions.
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页数:14
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