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以空间代替时间的方法,在干旱绿洲区选择大麦和苜蓿2种作物不同盐渍化阶段农田,并以非盐渍化农田作为对照,研究盐渍化过程中的水盐动态。结果表明:(1)不同盐渍化阶段的农田土壤含水量随土壤深度的变化有所不同,并且在大麦地10-40cm和80-100cm土层,苜蓿地20-120cm土层不同阶段农田间土壤含水量的差异显著性不同。在季节变化上,非盐渍化农田土壤含水量的变异显著高于盐渍化农田。(2)随着盐渍化程度的加剧,土壤电导率的峰值逐渐向上层移动;不同盐渍化阶段农田土壤电导率的垂直变化不同。在季节变化上,非盐渍化农田剖面电导率的变异要明显于其他盐渍化农田。(3)沿盐渍化梯度的增加,土壤中Na++K+含量表现为逐渐增加和表聚。(4)分析表明,盐渍化农田土壤水盐动态与作物生长状况、地下水电导率和土温有显著的相关性(P<0.05)。
In the method of space instead of time, two kinds of crops, barley and alfalfa, with different salinization stages were selected in the arid oasis area. The non-salinization farmland was used as a control to study the water and salinity dynamics during salinization. The results showed that: (1) The soil moisture content of farmland varied with soil depth in different salinization stages. In the fields of 10-40cm and 80-100cm in barley soil and in the fields of 20-120cm soil layer in alfalfa field, The difference of soil water content is significant different. In the seasonal variation, the variation of soil moisture content in non-salinized farmland was significantly higher than that in salinized farmland. (2) With the intensification of salinization, the peak value of soil conductivity gradually moved to the upper layer. The vertical changes of soil conductivity were different in different salinization stages. In the seasons, the variation of conductivity of non-salinized farmland is obviously different from other salinized farmland. (3) Along with the increase of salinization gradient, Na ++ K + content in soil showed a gradual increase and aggregation. (4) The analysis shows that there is a significant correlation between the soil water and salinity dynamics in the salinized farmland and crop growth, groundwater conductivity and soil temperature (P <0.05).