尿素氮形态转化对腐殖酸的响应  

Response of Urea-N Transformation to Humic Acid

作　　者：隽英华[1,2] 陈利军[1] 武志杰[1] 汪仁[2] 

机构地区：[1]中国科学院沈阳应用生态研究所,辽宁沈阳110016 [2]辽宁省农业科学院环境资源与农村能源研究所,辽宁沈阳110161

出　　处：《土壤通报》2011年第1期112-116,共5页Chinese Journal of Soil Science

基　　金：国家科技支撑计划资助项目-氮磷缓释促释技术研究(2006BAD10B01);国家科技支撑计划重点项目-东北冷凉区一年一熟制高效施肥关键技术研究与示范(2008BADA4B06)资助

摘　　要：通过模拟试验研究了不同用量腐殖酸对土壤中尿素氮形态转化的影响。结果表明,腐殖酸对尿素态氮形态转化的影响受其施用量的制约。与对照相比,低浓度腐殖酸(<15gkg-1)对尿素水解及以后的氮转化过程抑制作用较小,有时甚至促进了尿素水解;高浓度腐殖酸(15gkg-1和20gkg-1)则能明显的抑制尿素水解,延长尿素态氮在土壤中的停留时间,增加铵态氮含量,减少硝态氮的生成及氮素损失量,大大提高尿素利用效率。由此可见,腐殖酸不仅是一种脲酶抑制剂,还是一种硝化抑制剂。By simulation,an experiment was conducted to study the effects of different application amounts of humic acid on urea-N transformation.The results showed that the effectiveness of humic acid on urea-N transformation mainly depended on its application amount.Compared with control,lower application amount（15 g kg-1） of humic acid had little inhibition on urea hydrolysis and thereafter N transformation processes,and even a positive effect was observed on urea hydrolysis.On the contrary,higher application amount（15 g kg-1 and 20 g kg-1） of humic acid significantly retarded urea hydrolysis,prolonged the lasting time of urea-N in soil,increased the amount of NH4＋-N,and decreased the amount of NO3--N and the loss of fertilizer N,which increased the use efficiency of fertilizer N.It seemed from the results that humic acid was not only a urease inhibitor but also a nitrification inhibitor with a promising prospect.

关 键 词：腐殖酸 尿素水解 硝化作用 氮转化 

分 类 号：S153[农业科学—土壤学]