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掺沙对盐渍化土壤水盐分布及其蒸发特性的影响

Effects of sand mixing on soil water-salt distribution and soil evaporation characteristics for salinized soil

  • 摘要: 为了探明盐渍土水盐分布和土壤蒸发特性对掺沙的响应特征,以山东省滨州市无棣县“渤海粮仓”科技示范区土壤为研究对象,分析了不同掺沙量(沙-土质量比为0,10%,30%,50%和70%,分别以处理CK,T1,T2,T3和T4表示)对盐渍土水盐运移特征和土壤蒸发的影响.结果表明,0~5 000 min,处理T1和T2表层0~1 cm土壤的平均质量含水率比CK分别高了50.0%和40.7%,T3和T4表层0~1 cm土壤的平均质量含水率比CK分别低了36.3%和18.7%,而处理T1,T2,T3和T4表层0~1 cm土壤的平均电导率比CK分别低了16.3%,30.2%,8.1%和22.4%.处理CK,T1,T2,T3和T4的0~5 000 min的平均蒸发速率依次为1.52×10-3,2.08×10-3,1.49×10-3,2.03×10-3和1.52×10-3 mm/min; 5 001~14 000 min的平均蒸发速率分别为0.79×10-3,0.44×10-3,0.47×10-3,0.26×10-3和0.35×10-3 mm/min.

     

    Abstract: The soil of the ″Bohai Granary″ science and technology demonstration area in Wudi County, Binzhou City, Shandong Province was taken as the research object. The propose was to find the response characteristics of water-salt distribution and soil evaporation characteristics of saline soil to sand mixing. The effect of different amounts of sand mixed(sand-soil mass ratios were 0, 10%, 30%, 50% and 70%, respectively, denoted by CK, T1, T2, T3, and T4) conditions on the water-salt transport characteristics and soil evaporation indexes were analyzed. The results show that the average soil water content of 0-1 cm layer during the 0-5 000 min period for T1 and T2 is 50.0% and 40.7% higher than CK, while it is 36.3% and 18.7% lower than CK for T3 and T4, respectively; and the average electrical conductivity(EC) of 0-1 cm layer for T1, T2, T3 and T4 is 16.3%, 30.2%, 8.1% and 22.4% lower than that of CK, respectively. The average evaporation rate of CK, T1, T2, T3 and T4 treatment is 1.52×10-3, 2.08×10-3, 1.49×10-3, 2.03×10-3 and 1.52×10-3 mm/min during the 0-5 000 min period and 0.79×10-3, 0.44×10-3, 0.47×10-3, 0.26×10-3 and 0.35×10-3 mm/min during the 5 001-14 000 min period, respectively.

     

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