双氰胺对不同形态氮在红壤中转化的影响  

Effects of dicyandiamide on the conversion of different nitrogen forms in red soil

作　　者：杨春霞[1,2] 李永梅[1] 

机构地区：[1]云南农业大学资源与环境学院 [2]云南省热带作物科学研究所,云南景洪666100

出　　处：《生态环境》2005年第3期357-360,共4页Ecology and Environmnet

基　　金：云南省科技应用基础研究项目(2000C0012Q)

摘　　要：采用室内好气培养方法,研究了碳酸氢铵、尿素在红壤中的转化,加入硝化抑制剂(双氰胺)对尿素、碳酸氢铵的水解速率、硝化速率的影响,以及硝化抑制剂用量问题。结果表明,无论加入DCD与否,大部分尿素在4d内水解,各处理硝态氮质量分数于35d内出现峰值,铵态氮质量分数变化趋势基本相似,尿素态氮和铵态氮的形态差异主要存在于培养4d内。双氰胺的加入明显提高了相应处理的铵态氮质量分数,降低了硝态氮的质量分数;硝化抑制剂对高质量分数(≥50%)铵态氮、尿素态氮处理的抑制效果优于低质量分数(≤50%)处理。至培养结束时中壤土中仍存在较高质量分数的铵态氮,故铵的硝化时间、尿素水解产生铵的硝化时间有待进一步研究。This experiment was conducted using aerobic incubation to study the transformations of ammonium bicarbonate and urea in red soil. The effect of dicyandiamide (DCD) on their transformation and the amount of dicyandiamide were also investigated. The results showed that if adding DCD or not, the hydrolyzation of most urea took 4 days while NO3--N content was maximum after being incubated 35 days. The conversion rules of all treatments were similar while the form difference of ammonium and urea were only within 4 days. Adding DCD increased obviously ammonium content of relevant treatment and decreased nitrate nitrogen at the same time. Nitrification inhibiting of dicyandiamide for treatments with more NH4+–N and urea rate(≥50%) were better than them with less rate (≤50%). However the content of ammonium had been still high until aerobic incubation was over, the transformations of ammonium and urea in the medium loam soil need further study.

关 键 词：双氰胺 氮素形态 转化 硝化抑制作用 

分 类 号：X131.3[环境科学与工程—环境科学]