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采用不同用量外源稀土镧 ,研究其在红壤上的吸附及对红壤阳离子交换量和溶液组成的影响。结果表明 ,红壤对La3 + 具有较大的吸附容量和具有较高的可解吸性。当外源La3 + 浓度小于 40 0mg/kg时 ,被吸附的La3 + 具有较高的非交换性。阳离子交换量受外源镧的影响不显著 ;当外源镧浓度大于 30 0mg/kg时 ,土壤盐基饱和度与有效阳离子交换量显著降低 ,而交换性酸和交换性铝显著增加。浸出液中的盐基离子浓度随外源镧浓度提高而增加 ,且当外源镧浓度大于 5 0mg/kg时呈极显著差异
Different amounts of exogenous rare earth lanthanum were used to study their adsorption on red soil and its effect on cation exchange capacity and solution composition of red soil. The results showed that red soil had a larger adsorption capacity and high desorption ability for La3 +. When the exogenous La3 + concentration is less than 40 0mg / kg, the adsorbed La3 + has higher non-exchangeability. When the concentration of exogenous lanthanum was more than 300 mg / kg, the exchange rate of soil base saturation and available cation decreased significantly, while the exchangeable acid and exchangeable aluminum increased significantly. The concentration of base ions in the leachate increased with the increase of exogenous lanthanum, and the extremely significant difference was found when the concentration of exogenous lanthanum was more than 50 mg / kg