Study On Soil Hydrological Charactereristics In Rocky Mountain Areas Of North China

The study of Soil Hydrological Characteristics in rocky mountain area is the premise and foundation of the research on the mechanism of slope water circulation and the analysis of runoff generation and confluence in mountain area,It can not only establish a theoretical basis for the development of hillside hydrology,Moreover,it has important theoretical and practical significance for the regional environmental governance in mountain areas,At the same time,it can provide scientific basis for rational development and utilization of water resources in Taihang Mountain Area.In this study,selecting the ChongLing Catchment as the research area and carries out related research work through field experiments and laboratory test.The change law and spatial distribution law of soil physical properties and hydrodynamic parameters under the condition of vegetation and slope,Statistical characteristics,correlation,variability and spatial distribution of soil thickness and rock weathering layer thickness,Influencing factors of soil water content and its response to soil water content are analyzed in detail.Tthe main research results are as follows:(1)The curve of soil particle-size distribution is similar between Vitex negundovar and Pimus tabulaeformis;The curve of soil particle-size distribution is similar between Bioa orientlis and Robinia pseudoacacia;Soil bulk density and capillary porosity gradually increase with depth increases,while total porosity,non-capillary porosity and permeability coefficient decrease gradually;With the increase of slope,the bulk density and capillary porosity increase gradually,while total porosity and non-capillary porosity decrease gradually;The spatial distribution,bulk density,non-capillary porosity and permeability coefficient in the central area of largest granite gneiss is the largest,in other areas,it is small,while the capillary porosity and field capacity in the limestone area is largest,other area is relatively small;(2)Based on Geostatistics research methods,the influence factors of soil thickness and rock weathering layer thickness,statistical characteristics,variation trend,spatial correlation and variability and spatial distribution rule are analyzed;Data samples of soil thickness and rock weathering layer thickness data showed moderate variability;The best semi variogram model of soil thickness and rock weathering layer thickness is an exponential function model;In the east-west direction,the fitting curve of soil thickness is inverted U,and the fitting curve of rock weathering layer thickness is exponential;In the North-South direction,the fitting curve of soil thickness is power function,while the curve of rock weathering thickness is inverted U;Soil thickness has strong spatial correlation,while the thickness of rock weathering layer has moderate intensity correlation;In the spatial distribution,the soil thickness increases from northwest to Southeast,while rock weathering layer thickness is opposite;(3)Soil water content in Songlin area increases with depth;Soil water content in Huangpo area decreases first and then increases with the increase of the depth,Soil water content is positively related to precipitation,and with the increase of precipitation,soil water content gradually increases;when soil water content was lower than the wilting coefficient,the temperature has little effect on soil moisture content,while soil moisture content is higher than the wilting coefficient,with the temperature increasing soil water content increased gradually.The influence of temperature on soil water content is stronger than precipitation...