片麻岩新成土中硝态氮垂直运移规律模拟研究

采用室内土柱模拟的方法，研究河北省太行山片麻岩新成土中不同肥料、不同施氮量对硝态氮垂直运移的影响。结果表明，尿素、有机无机混合肥、氮磷复合肥中硝态氮淋失总量比值为1∶0.87∶0.94。中等施氮量下，有机无机复混肥可以降低氮素淋失。尿素硝态氮淋失率平均为29%，氮磷复合肥平均为27.8%，有机无机混合肥平均为23.7%。60 cm和90 cm处硝态氮淋失量比值为1∶1.03，差异不显著。淋溶结束后，有机无机混合肥在不同土层各处理中硝态氮含量最高，尿素硝态氮含量最低。

Simulation Study on Nitrate Transport and Leaching in the Gneiss Entisols

By simulating soil column in laboratory, the effects of the nitrate vertical transport characteristics in the gneiss of Taihang mountainous region of Hebei Province under different N fertilizer were studied. The results showed that the ratio of leaching loss amounts of nitrate-nitrogen was 1∶0.87∶0.94 among urea, organic-inorganic mixed fertilizer and N-P compound fertilizer. The amount of nitrate leaching increased with the increasing amount of nitrogen fertilizer, but there was no significant difference among the three fertilizers. Organic-inorganic mixed fertilizer could reduce nitrate leaching with the medium nitrogen fertilizer application. For urea, the rate of nitrate leaching loss averaged 29%, 27.8% for N-P compound fertilizer, 23.7% for organic-inorganic mixed fertilizer. With the increase of soil depth, there was no significant difference between 60 cm and 90 cm in which the ratio of nitrate-nitrogen leaching loss was 1∶1.03. At the end of the leaching, the nitrate content of organic-inorganic mixed fertilizer was the highest and the urea nitrate content was the lowest in different treatments.