SAR,EC与水温对辽西褐土入渗速率的影响研究

Effects of SAR/EC and Water Temperature on Infiltration in Cinnamon of Western Liaoning

土壤入渗速率是影响灌溉水产流、侵蚀的重要因素之一。为了研究不同水温、不同SAR/EC下辽西褐土入渗速率,进行了室内变水头渗透试验。结果表明:SAR,EC一定时,渗透系数随着灌溉水水温的升高而增大,水温从15℃升至35℃,土壤渗透系数增大了1.3倍;随着灌溉水SAR增加、EC降低,土壤渗透系数会下降,水温35℃情况下SAR从0.7(mmol/L)0.5增大至12.0(mmol/L)0.5,EC从2.0dS/m减小至0.5dS/m时,土壤渗透系数由0.000 698cm/s减小至0.000 338cm/s,渗透系数下降了51.6%。相关分析表明水温、SAR/EC对渗透系数的影响显著,回归分析分别建立了沟灌土壤渗透系数与水温、SAR/EC二次函数数学模型,相关性极好。

Soil infiltration rate is one of the important factors affecting runoff yield and soil erosion. Indoor variable head penetration test was conducted to study the influence of different water temperatures, sodium adsorption ratios（SAR） and electric conductivities（EC） in cinnamon of Western I.iaoning Province. Under the same SAR and EC, soil infiltration coefficient increased with the increase of irrigation water temperature, soil infiltration coefficient increased 1.3 times while the temperature ranged from 15~C to 35~C. Soil infiltra- tion coefficient dropped with increase of SAR and decrease of EC of the irrigation water. SAR increased from 0.7 （mmol/L）~~ to 12 （retool/L）~＇~ , EC decreased from 2.0 dS/m to 0. 5 dS/m, the soil infiltration rate decreased from 0. 000 698 cm/s to 0. 000 338 cm/s, the infiltration coefficient decreased by 51. 6~ while water temperature was 35~C. Correlation analysis revealed that water temperature and SAR/EC had the significant influence on the infiltration coefficient. The quadratic function mathematic models describing the relationship between soil infiltration coefficient and water temperature and SAR/EC were established respec tively through the regression analysis, and variables in the models had the good correlation.