元素硫和双氰胺对菜地土壤铵态氮硝化抑制协同效应研究  

Synergistic nitrification-inhibiting effect of elemental sulfur and dicyandiamide in a typical vegetable soil

作　　者：刘常珍[1] 胡正义[2] 赵言文[1] 牛高华[1] 肖新[1] 毕冬梅[1] 

机构地区：[1]南京农业大学农学院,江苏南京210095 [2]中国科学院南京土壤研究所土壤与持续农业国家重点实验室,江苏南京210008

出　　处：《植物营养与肥料学报》2008年第2期334-338,共5页Journal of Plant Nutrition and Fertilizers

基　　金：国家科技部“863”项目(2002AA6012,2005AA60101002);国家自然科学基金重点项目(40335047)资助

摘　　要：采用好气培养法,研究了双氰胺(DCD)、元素硫(S0)和元素硫分解中间物(S2O32-)及其组合对蔬菜地土壤氮素硝化抑制作用。结果表明,在培养试验72 d内,DCD+S0、DCD、DCD+Na2S2O3处理土壤NH4+-N总量分别是N处理的5.8、5.1、5.9倍;S0、Na2S2O3处理分别是N处理的1.8、1.4倍;而所有硝化抑制剂(DCD、S0、S2O32-)处理土壤NO3--N含量显著低于N处理,表明DCD、S0和S2O32-均能抑制菜地土壤铵态氮硝化。培养试验开始8 d后,Na2S2O3和DCD对铵态氮硝化抑制产生协同效应,16 d后S0和DCD对铵态氮硝化抑制也产生协同效应,这可能是由于S0氧化中间体S2O32-、S4O62-具有抑制DCD降解作用,延长了DCD硝化抑制作用时间。建议蔬菜生产上推荐使用DCD+S0组合,以提高氮素利用率。An incubation experiment was conducted to investigate the effect of three nitrification inhibitors[dicyandiamide （DCD）, elemental sulfur （S^0） and thoisulfate （S2O^2-3）] on nitrification of NH4^＋ -N in a typical vegetable soil. The resuits showed that within 72 day-incubation period, the soil NH^＋4 -N content at DCD ＋ S^0, DCD and DCD ＋ Na2S2O3 treatment was 5.8, 5.1 and 5.9 times of that at N treatment, respectively, and soil NH4^＋ -N content at So and Na2S2O3 treatment was 1.8 and 1.4 times of that at N treatment, respectively. Soil NO3^-N content was obviously lower in nitrification inhibitor treatments than in those without nitrification inhibitor treatments, implying that DCD, So and S2O^2-3 could inhibit nitrification of soil NH4^＋ -N in the vegetable soil. Synergistic effect of DCD ＋ So and DCD ＋ S2O^2-3 on nitrification inhibition of soil NH4^＋ -N was observed 16 and 8 days after the incubation experiment, respectively. This could be contributed to the effect of S2O^2-3 and S4O6^2- originated from So oxidation in soil on restraining decomposition of DCD, prolonging the time of DCD for nitrification inhibition. It is suggested that application of So combined with DCD could be used as a nitrification inhibitor in vegetable soils to increase fertilization nitrogen efficiency.

关 键 词：元素硫 双氰胺 菜地土壤 硝化抑制作用 硝态氮 

分 类 号：S153[农业科学—土壤学]