淹水条件下种植水稻对氮元素渗漏的影响

为了探明淹水植稻条件下氮元素在土层中的垂直移动、渗漏情况，设置了模拟土柱培养试验。试验以淹水种植水稻为处理，以淹水不种水稻为对照，探讨植稻对模拟土柱（40cm埋深处）渗漏水硝态氮、铵态氮的淋出数量的影响。结果表明：硝态氮与铵态氮相比，硝态氮极易流失；在试验整个过程中，淹作种植水稻硝态氮总流失量流失远大于不种水稻，铵态氮则与之相反；从绝对数量看，种植水稻与不种植水稻氮的渗漏都以硝态氮为主。

The Effects of Waterlogged Rice on the Leakage of Nitrogen

The leakage of nitrogen under waterlogged rice condition was compared with that under normal condition. The results showed that, more NO3-^-N was lost under riee-planting condition than that without planting rice,while a reverse result was obtained for NH3-^-N. However, the nitrogen lost from the soil was mainly in the form of NO3-^-N both under rice-planting and no-riee-planting conditions.