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采用控制取样和典型取样相结合的方法,对比分析了红寺堡扬黄灌区玉米地和枸杞地、未利用地0～40cm分层土壤质地、盐渍化特征、阳离子交换量(CEC)值及其相关关系.结果表明:控制取样条件下,除未利用地0～10cm土壤含盐量(TS)达1.74g·kg-1外,3种利用方式下0～40cmTS在0.69～1.30g·kg-1之间变化,盐化特征不明显;枸杞地20～40cm土壤钠吸附比(SAR)和土壤碱化度(ESP)分别达到12.18%和14.1%;玉米地0～20cm粘粉粒和(CPS)为13.5%,枸杞地0～40cmCPS达37.3%.控制取样条件下,20～40cm土层玉米地土壤碱化和沙化指标间显著相关;典型取样条件下,上述相关性消失,但CEC与沙化指标及盐渍化指标均显著相关.不同土地利用方式下灌区土壤沙化和盐渍化呈复杂的交互关系,CEC可以作为土壤环境质量变化的综合指示因子.
By using the combination of controlled sampling and typical sampling, the soil texture, salinization characteristics, cation exchange capacity (CEC) value and its correlation in 0-40 cm layer of unused land in maize and wolfberry fields in Hongsipuang Yellow Irrigation Area were comparatively analyzed The results showed that 0 ~ 40cmTS of 0 ~ 40cmTS was 0.69 ~ 1.30g · kg-1 under the three kinds of utilization except for the soil salinity (TS) of 0 ~ 10cm up to 1.74g · kg- (SAR) and soil alkalization (ESP) of 20-40 cm soil in Lycium barbarum reached 12.18% and 14.1%, respectively; and that of 0-20 cm sticky particles and (CPS) Was 13.5% and the percentage of 0-40cmCSP in wolfberry was 37.3%. Under controlled sampling conditions, there was a significant correlation between soil alkalization and desertification index in maize land under 20 ~ 40cm soil layer. Under typical sampling conditions, the above correlation disappeared, but CEC and desertification index And salinization index were significantly correlated.The relationship between soil salinization and salinization showed a complex interaction under different land use patterns, and CEC could be used as a comprehensive indicator of soil environmental quality changes.