摘要
采用野外田间试验方法，研究了淹水稻田施用碳铵后，氮素的转化、运移和损失的作用过程。结果表明，田间水中氮素以氨氮为主，淹水稻田剖面土壤溶液中氨氮和硝态氮的含量随深度增加而降低。土壤 0.5 m深度以下，淋溶液中硝态氮和氨氮水平较低，在 0.6— 4.8μ g· mL－ 1之间，对地下水环境有一定影响。模拟暴雨径流试验表明，田间氮素径流损失负荷随施肥与降雨间隔时间延长而明显降低，施肥后短时间内暴雨径流导致的氮肥损失较大，对地表水环境污染严重， 必须加强科学合理的田间水肥管理。
An Experiment was done to assess the loss of nitrogen in rice field during tillering stage of paddy rice at a farm water conservancy test station in Qingpu, Shanghai. After application of ammonium bicarbonate, to rice field with drowned water, it has been found that most of nitrogen was in , with a large variation of concentrations by the time. In soil solution of vertical profile, the concentration levels of and were not high under the conditions of drowned and anaerobic reduction, in an range of from 0.6mg· L－ 1 to 4.8 mg· L－ 1, decreasing with depth. In addition, there still existed a certain contamination on the groundwater. Simulated rainmaking tests showed that the nitrogen loss load of runoff in rice field was closely related to the interval time between applying fertilizer and rainfall. When rainfall occurred briefly after applying fertilizer, the runoff loss of nitrogen in rice field may be up to about 10％ , which considerably affect on surface water quality.
出处
《农业环境保护》
CSCD
北大核心
2001年第4期196-198,205,共4页
Agro-Environmental Protection
基金
国家自然科学基金资助项目( 49831070)
上海市教委重点学科项目资助
