摘要
在室内降雨模拟试验条件下，研究暴雨径流中农田氮素养分流失及施肥处理的影响。结果表明，农田暴雨径流氮养分的流失量与累积径流量成正相关；施用NH4HCO3显著地增大了农田径流中溶解态氮浓度及流失量（P=0.01），而对颗粒态氮浓度及流失量没有显著影响（P=0.1）；在大暴雨和裸露地试验条件下，颗粒态氮是农田暴雨径流氮养分流失的主要形态；在44 min降雨径流中，以颗粒态流失的氮达476.3～488.7 mg/m2；侵蚀泥沙有富集氮养分的特点，其富集系数与侵蚀泥沙累积量存在对数线性关系：LOG(ER)=0.770-0.300LOG(SED)；减少地表径流和土壤侵蚀，降低表土中速效氮养分含量是减少农田地表径流氮流失的关键。
Rainfall simulation experiment was performed to evaluate nitrogen losses from farmland and show the effect of fertilizer application on nitrogen concentration and losses of runoff. As expected, cumulative N loss of runoff is directly correlated with cumulative runoff; dissolve nitrogen concentration and the dissolve nitrogen lost significantly increase (P=0.01), but particulate nitrogen concentration and particulate nitrogen lost do not significantly increase (P=0.1) in farmland runoff of fertilizer application of NH4HCO3. Particulate nitrogen lost account for 476.3~488.7 mg/m2, and particulate nitrogen is the main form of N losses. Nutrient of N is enriched in eroded sediment, the logarithm of N enrichment ratio (ER) is negatively correlated with the logarithm of accumulated sediment discharge: log(ER)=0.770-0.300 log(SED).
出处
《土壤与环境》
CSCD
2001年第1期6-10,共5页
Soil and Environmental Sciences
基金
国家自然科学基金重大项目!(39790100)
