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Effect of soil Water Repellency on Energy Partitioning Between soil and Atmosphere:A Conceptual Approach

Pedosphere 2014年第4期24卷 498-507页

作者： H.SCHONSKY A.PETERS G.WESSOLEK Department of soil Conservation Institute of EcologyTechnical University of BerlinD-10587 Berlin(Germany)

Water repellency(WR) is a phenomenon known from many soils around the world and can occur in arid as well as in humid climates;few studies,however,have examined the effect of soil WR on the soil-plant-atmosphere energy *** aim of our study was to estimate the effects of soil WR on the calculated soil-atmosphere energy balance,using a solely model-based *** made out evapotranspiration to have the largest influence on the energy balance;therefore the effect of WR on actual evapotranspiration was *** achieve this we used climate data and measured soil hydraulic properties of a potentially water-repellent sandy soil from a site near Berlin,Germany.A numerical 1D soil water balance model in which WR was incorporated in a straightforward way was applied,using the effective cross section *** were carried out with vegetated soil and bare *** simulation results showed a reduction in evapotranspiration of 30-300 mm year^(-1)(9%-76%) at different degrees of WR compared to completely wettable soil,depending on the severity degree of soil *** energy that is not being transported away by water vapor(i.e.,due to reduced evapotranspiration) had to be transformed into other parts of the energy balance and thus would influence the local climate.

关键词： climate effective cross section evapotranspiration soil-atmosphere energy balance soil hydraulic property water balance

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Inverse modeling approach for determining soil hydraulic properties as affected by application of cattle manure

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International Journal of Agricultural and Biological Engineering 2014年第2期7卷 27-35页

作者： Ali Rasoulzadeh Ali Yaghoubi Department of Water Engineering Faculty of AgricultureUniversity of Mohaghegh ArdabiliArdabilIran Department of soil Science Faculty of AgricultureUniversity of Mohaghegh ArdabiliArdabilIran

Numerical codes are extensively used in the modeling of water and solute transport in the vadose *** application of these codes depends on knowledge of soil hydraulic properties such as soil water retention curve and hydraulic *** of cattle manure to the soil can increase soil organic matter(SOM)*** in SOM associated with changes in the structure and adsorption properties of soil and,thus,their hydraulic *** this study the effect of cattle manure on soil hydraulic properties was investigated using inverse *** inverse method was based on Levenberg-Marquart optimization algorithm to estimate hydraulic properties of soil in transient condition using C++programming language along with forward model(HydroGeoSphere)as a numerical *** iron cylinders of 57 cm in inner diameter and about 40 cm in height were filled with Sandy clay loam soil of 30 cm in *** manure applied at 0,30,and 60 Mg/ha at three replications in a completely random *** year after cattle manure application,saturated hydraulic conductivity,porosity,and water retention curve parameters(van Genuchten function,αandβ)were estimated using inverse *** analysis showed that the automatic calibration is sensitive toαmore than the other *** results showed that porosity,saturated hydraulic conductivity,residual water content,αandβincreased significantly(Phydraulic parameters of soil.

关键词： soil hydraulic property parameter estimation inverse method HydroGeoSphere unsaturated flow cattle manure

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