通过培养试验及盆栽试验研究了外源镧在红壤中的有效性及其对土壤酸度的影响。结果表明 ,土壤有效态镧随外源镧的增加而增加 ,两者呈显著的正相关 ;外源镧在土壤中具有较高的有效性 ,随着时间的延长有效性逐渐降低 ;土壤 p H随外源镧的增加不断降低 ,p H和外源镧及有效态镧均呈显著的负相关 ;过量的镧对土壤生态环境将产生破坏作用 The effects of exogenous lanthanum in red soil and its effect on soil acidity were studied through culture experiments and pot experiments. The results showed that the effective lanthanum content increased with the increase of exogenous lanthanum, which showed a significant positive correlation. The lanthanum exogenous lanthanide was highly effective in soil, and its availability decreased with time. Soil p H With the increase of exogenous lanthanum decreasing, p H and exogenous lanthanum and available lanthanum showed a significant negative correlation; excess lanthanum on the soil environment will have a damaging effect