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土壤氮素是制约作物产量和品质的主要环境因素之一,施用氮肥对农业生产的发展起着重要的作用,研究碳酸氢铵的迁移转化规律对于现代农业发展具有重要意义。通过室内土柱试验对不同碳酸氢铵化肥施用量和不同降雨量进行模拟,在充分供水条件下,抽取土柱不同高度处不同时间的水样,通过测量氨氮、硝态氮和总氮的浓度,分析无机氮垂向迁移转化的规律。结果表明,浅层土中氨氮浓度急剧降低,深层土中氨氮浓度先增加后降低;化肥施用量越多,氨氮浓度变化趋势越平缓;降雨量越大,氨氮损失量越高;硝态氮浓度先增加后降低;化肥施用量越高,硝态氮浓度变化趋势越剧烈;降雨量的变化对硝态氮浓度影响不大;总氮浓度变化趋势与氨氮保持一致。
Soil nitrogen is one of the main environmental factors restricting crop yield and quality. The application of nitrogen fertilizer plays an important role in the development of agricultural production. Studying the law of migration and transformation of ammonium bicarbonate is of great significance to the development of modern agriculture. The indoor soil column test was used to simulate the different amounts of ammonium bicarbonate fertilizer and different rainfalls. Under sufficient water supply conditions, water samples from soil columns at different heights at different altitudes were extracted. Through measuring the concentrations of ammonia nitrogen, nitrate nitrogen and total nitrogen , Analysis of the law of vertical migration and transformation of inorganic nitrogen. The results showed that the concentration of ammonia nitrogen in shallow soil decreased sharply, the concentration of ammonia nitrogen in deep soil first increased and then decreased. The more the chemical fertilizer applied, the more gentle the change of ammonia nitrogen concentration. The higher the rainfall, the higher the ammonia nitrogen loss. First increased and then decreased; the higher the chemical fertilizer application, the more intense the change trend of nitrate nitrogen concentration; the change of rainfall has little effect on the concentration of nitrate nitrogen; the trend of total nitrogen concentration is consistent with that of ammonia nitrogen.