Locating Studies On Infiltration Process And Water Conservation Capacity Of Soil With Four Vegetation Patterns In Hong'ya Of Sichuan Province

In order to choose fitter vegetation patterns, Infiltration process and physical properties of soil were locatingly observed in Hong'ya county of Sichuan province with the traditional ways. The correlation between soil infiltration rate and soil physical properties was analyzed to seek the leading factors which influent infiltration capacity. Infiltration process of soil in four vegetation patterns was respectively simulated with Horton model, Philip model and the current formula of soil infiltration. At last in order to analyze the improved effect on soil, the staggered research was discussed in the following aspects: infiltration capacity of soil, water holding capacity for soil and litter layer. The results show:Soil initial infiltration rate had a significantly negative relationship with soil bulk of 0~20cm depth, The second influential factor is soil non-capillary porosity, soil total porosity and soil organic matter had some effect on infiltration rate.Soil capillary porosity in 0~20cm depth is the leading factor which influents soil steady infiltration rate, and both of them had a positive relationship. Soil steady infiltration rate had significant correlation with soil humus matter, soil capillary porosity and capillary porosity in 20~40cm depth respectively.The initial phrase of soil infiltration process can be simulated with Philip and Horton infiltration formula, but the simulated result was not good in the steady phrase. The current formula of soil infiltration was similar to infiltration process in the initial phrase and can simulate total infiltration process better. The result showed that the current formula of soil infiltration adapted to simulate soil infiltration process in this studied area.As we know after analyzing litter layers, water holding capacity of litter layers was the same as change tend of litter layer account, and its change rule was pattern â…¡ > pattern â…¢ > pattern â…  , there weren't litter layer account in the comparison and its water holding capacity was zero.Analyzing soil water holding capacity, we know that soil non-capillary porosity in the 0~20cm depth was more than one in the 20~40cm depth in four vegetation patterns, and the change rule was patter II > patter III > pattern IV > pattern I .the change rule of soil infiltration capacity was patter II > patterIV >patternIII> pattern I .Litter lays accounts, soil non-capillary porosity and infiltration capacity was distinctly increasing in four vegetation patterns. In generary, pattern II had best effect on water conservation capacity of soil, patter I had better effect on it, patternlV had good effect on it, and patternlllhad little effect.