| 1 | Methodological Framework for a Multi-Scale Study on Hydrological Processes and Soil Erosion in Subtropical Southeast China显示文摘This paper introduces and illustrates the concepts of geoecological process combinations and geographical or landscape dimensions by outlining the methodology of a Sino-German cooperative project in Southeast China and presents the first results of the modelling process for the catchment scale. The project equipped a catchment in subtropical Southeast China from plot scale to catchment scale in order to study the hydrological and soil erosion processes. Distinct spatial differences in principal water and soil material fluxes were quantified. Deep drainage peaks occurred in May, June and July and even in August and November. Measurements in erosion plots as well as sedimentary deposits revealed that there was soil erosion connected with overland flow. Consistent with the results from the regular catenary variations of soil colors, textural stratification and hydrograph analysis, there was also a clear indication of interflow from measured soil moisture data. The experimental set up has the potential to further deepen the understanding of small-scale processes involved in lateral water fluxes and soil erosion. The expected results and interpretations will lead to a further integration of the collected data. In the future, to understand matter transfer in and between landscape ecological units, agricultural influence on nutrient status and flux data will be incorporated. | H. ZEPP TANG Jia-Liang ZHANG Bin | 2005 | Pedosphere2005，15，6： | 8 |
| 2 | Anisotropy of Soil Hydraulic Properties Along Arable Slopes显示文摘The spatial variations of the soil hydraulic properties were mainly considered in vertical direction.The objectives of this study were to measure water-retention curves,θ(ψ),and unsaturated hydraulic conductivity functions,K(ψ),of the soils sampled at different slope positions in three directions,namely,in vertical direction,along the slope and along the contour,and to determine the effects of sampling direction and slope position of two soil catenas.At the upper slope positions,the surface soils(0-10 cm) sampled in the vertical direction had a lower soil water content,θ,at a certain soil water potential(-1500 kPa < ψ <-10 kPa) and had the greatest unsaturated hydraulic conductivity,K,at ψ > -10 kPa.At the lower slope positions,K at ψ > -10 kPa was smaller in the vertical direction than in the direction along the slope.The deep soils(100-110 cm) had similar soil hydraulic properties in all the three directions.The anisotropic variations of the hydraulic properties of the surface soils were ascribed to the effects of natural wetting and drying cycles on the structural heterogeneity.These results suggested that the anisotropy of soil hydraulic properties might be significant in inffuencing soil water movement along the slope and need to be considered in modeling. | JING Yuan-Shu ZHANG Bin A. THIMM H. ZEPP | 2008 | Pedosphere2008，18，3： | 4 |
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