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首页> 外文期刊>South African Journal of Plant and Soil >The effect of degree and duration of water saturation on selected redox indicators: pe, Fe2+ and Mn2+.
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The effect of degree and duration of water saturation on selected redox indicators: pe, Fe2+ and Mn2+.

机译：水分饱和度和持续时间对选定的氧化还原指标pe，Fe 2 + 和Mn 2 + 的影响。

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It was previously hypothesised that reduction in the soil will set in at 70% water saturation (S0.7). This study aimed to determine the effect of different degrees and durations of water saturation on reduction in soil. Reduction was measured as a decrease in soil oxidisability (pe) and an increase in soluble iron (Fe2+). A yellow brown apedal B horizon from profile 234 in the Weatherley catchment was used in this study. Soil cores were packed to a bulk density of 1.6 Mg m-3 and saturated to S0.6 (60% of the pores saturated with water), S0.7 (70% of the pores saturated with water) S0.8 (80% of the pores saturated with water), and S0.9 (90% of the pores saturated with water). Analyses started three days after water saturation. Samples were analysed every 3.5 days for the first three months and then once a week for another month. The experiment was terminated after 121 days. There was a good correlation between an increase in degree of water saturation and pe (R2=0.95), Mn2+ (R2=0.99) and Fe2+ (R2=0.99) concentration. The tendency was for pe, pH, Fe2+, and Mn2+ to remain relatively stable at S0.6 and to increase in variability as the water saturation increased, with most variability observed at S0.9. The change in redox activity took place between the S0.7 and S0.8 treatments. For this particular soil the highest rate of reduction took place in the S0.9 treatment.
机译：以前曾有过这样的假设：土壤的减少将达到70％的水饱和度（S 0.7 ）。这项研究旨在确定不同程度和持续时间的水饱和度对土壤还原的影响。减少量的测量是土壤可氧化性（pe）的降低和可溶性铁（Fe 2 + ）的增加。在这项研究中，使用了韦瑟利集水区234剖面的黄褐色踏板B地平线。土壤岩心堆积至堆积密度为1.6 Mg m -3 ，并饱和至S 0.6 （60％的孔隙被水饱和），S 0.7 < / sub>（70％的孔隙被水饱和）S 0.8 （80％的孔隙被水饱和）和S 0.9 （90％的孔隙被饱和）与水）。在水饱和后三天开始进行分析。在最初的三个月中，每3.5天分析一次样品，然后在另一个月中每周一次分析样品。 121天后终止实验。水分饱和度的增加与pe（R 2 = 0.95），Mn 2 + （R 2 = 0.99）和Fe 2 + （R 2 = 0.99）浓度。 pe，pH，Fe 2 + 和Mn 2 + 的趋势是在S 0.6 保持相对稳定，并随着变化而增加。水分饱和度增加，在S 0.9 处变化最大。氧化还原活性的变化发生在S 0.7 和S 0.8 处理之间。对于这种特殊的土壤，在S 0.9 处理中还原率最高。

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