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以苏打盐化草甸土和苏打碱土2种土壤类型为研究对象,研究苏打盐渍土土壤水分特征,并对土壤水分特征曲线进行模拟。结果表明,0~40 cm土壤层,盐化草甸土总孔隙度大于50%,毛管孔隙中以0.1~1.2 mm当量孔径的粗孔隙为主,苏打碱土总孔隙度低,主要以小于0.1 mm当量孔径的细孔隙为主;0~40 cm土壤层在相同水势作用下,盐化草甸土土壤含水率明显高于苏打碱土,说明苏打碱土土壤持水能力较低。通过模型模拟,获得不同土壤层的水分特征曲线参数,模拟值与实测值相关系数均在0.9以上,模型具有可靠性。
Two soil types, sodic saline meadow soil and soda ash soil, were selected as the research object to study the characteristics of soil moisture in sodic saline soil and to simulate the soil water characteristics curve. The results showed that the total porosity of salinized meadow soil was greater than 50% in 0-40 cm soil layer and salinized meadow soil, while the crude porosity in capillary pores was 0.1-1.2 mm equivalent. The total porosity of soda ash soil was low, mainly less than 0.1 mm Equivalent pore size. The soil water content of salinized meadow soil under 0-40 cm soil layer was significantly higher than that of sodic soil under the same water potential, which indicated that soil water holding capacity of sodic anaerobic soil was low. Through the model simulation, the parameters of water characteristic curves of different soil layers were obtained. The correlation coefficients between simulated and measured values were above 0.9, and the model was reliable.