Analysis Of Hydrological Pattern Of Vegetation Interception In Gongga Mountain

Through the field experiment data and geological, hydrological, meteorological and hydrological data, analysis of the study area of the litter interception and soil moisture variation. To forest litter interception precipitation amount and time lag effect and woodland soil water-holding performance has carried on the quantitative study, the litter and soil interception effect of precipitation are analyzed.(1) In the laboratory through to the broad-leaved forest, coniferous and broad-leaved mixed forest, coniferous forest and mature and immature coniferous forest 4 vegetation intheEast slope of GonggaMountainlitter artificial rainfall interception test.Litter observation of different vegetation in interception of precipitation and the law of the area. Data to make a scatter diagram is used to judge roughly function model, choose different linear function, quadratic polynomial function, power function as the base functions respectively to four planting interception rate and the relationship between area and the least squares curve fitting, four planting interception rate and the relationship between the area into a quadratic polynomial function. Analysis compares the use of the effect of different basis function for curve fitting. Rule for rainfall time lag effect in the use of conventional under the condition of poor basis function fitting, through the analysis of the local characteristics of scatter, adopt the method of piecewise curve fitting, get four different vegetation of rainfall lag time of empirical formulae for subsection exponential fitting function, its relevance was more than 0.89, the fitting effect is good.(2)In the analysis of four planting is the law of soil moisture content, because the data appear a peak, so the use of the polynomial curve fitting, but the degree of polynomial is too high, the data becomes extremely unstable, the ill condition of the emergence of polynomial fitting. By analyzing the changes of original data and geological characteristics of the piecewise fitting, according to the features of the data, the sine function curve fitting, by a combination of a suitable set of sine function and its correlation in more than 0.91, the fitting effect is good, the expression level of the soil moisture content change rule. The actual data of well described.Based on the test data to the circumstances involved, analysis of the hydrological effect of forest hydrology process, based on the analysis of characteristics of the data itself and geological background, the modeling of hydrological variables, the solution and good effect,and can be extended to the study of forest hydrological characteristics between different variables.