农业环境科学学报2011，Vol.30Issue(12)：2496-2502,7.
硝化抑制剂双氰胺对褐土中尿素转化的影响
Effects of Nitrification Inhibitor Dicyandiamide on Ammonium and Nitrate Nitrogen Transformations in Cinnamon Soil
摘要
Abstract
An aerobic soil incubation experiment was carried out to study the effects of different levels of the nitrification inhibitor dicyandi-amide( Dicyandiamide, DCD) on the transformations of nitrate nitrogen and ammonia nitrogen in Beijing cinnamon soil. The results showed that during the 44 days incubation period, the application of DCD resulted in significanT1y higher concentrations of soil NH4+-N and lower concentrations of NO3--N in the soil. When the application rate of DCD was 1%, 2%, 3%, 4% and 5%, the average soil NH4-N concentration was increased by 29.50%,71.84%, 99.73%, 98.90% and 139.69%, the average NO3--N·concentration was decreased by 3.71%, 15.61%, 21.07%, 33.57% and 37.90%, compared with the urea control respectively. The comprehensive index of soil apparent nitrification rate, reflecting the change rule for NO3--N and NH4+-N, was decreased by 12.18%、35.35% 、44.82%、48.18% and 59.93%, respectively. And the reaching balance date of them delayed 7 days, 14 days, 14 days and 21days at the levels of 1%, 2%, 3% and 4%, respectively. It has showed a rising trend until the incubation end at the level of 5%, always lower than the control, and the increase rate was significanT1y decreased by 39.32%,40.00%,52.27% at the levels of 2%, 3%, 4%, respectively. Based on a combination of crop N requirements, environmental benefits and economic factors, the optimum rate of DCD was 4%, with a good inhibitory effect of ammonium oxidation, whilst helping to improve nitrogen use efficiency, and reducing environmental impacts.关键词
DCD用量/好气培养/NH+4 -N/NO-3 -N/表观硝化率Key words
DCD level/ aerobic soil incubation/ NH4+-N/ NO3--N/ apparent nitrating rate分类
农业科技引用本文复制引用
刘瑜,串丽敏,安志装,赵同科,赵丽平,高忠义,李英..硝化抑制剂双氰胺对褐土中尿素转化的影响[J].农业环境科学学报,2011,30(12):2496-2502,7.基金项目
沿湖地区农业面源污染阻控关键技术研究(2007BAD87B01) （2007BAD87B01）
国家科技支撑计划:沿密云官厅水库集约化种养殖农业面源污染防控技术研究与示范(2007BAD87B02) （2007BAD87B02）
中国-加拿大IPNI国际合作项目:北京市菜田土壤养分优化管理研究与示范 （）
农业部环境保护项目:华北地区大中城市郊区农业生产区域地下水硝酸盐监测与评价 （）
