硝化抑制剂对典型茶园土壤尿素硝化过程的影响

发布时间：2019-01-23 17:40

【摘要】：通过室内好氧培养试验,研究了双氰胺(DCD)和2-氯-6-三氯甲基吡啶(Nitrapyrin)2种常用硝化抑制剂对我国4种典型茶园土壤硝化过程的影响。试验设置5个处理:(1)尿素(CK);(2)尿素+2%DCD(DCD占施氮量的2%,下同);(3)尿素+10%DCD;(4)尿素+0.27%Nitrapyrin;(5)尿素+0.54%Nitrapyrin。结果表明:对于4种供试茶园土壤,DCD在培养过程中对硝化过程的抑制效果随培养时间的延长呈下降趋势,且高浓度DCD仅在培养第28 d时才表现出比低浓度DCD更强的抑制效果。培养第28 d后,在安溪和宜兴茶园土壤中DCD的抑制率仍可达12.15%~59.68%,而对于杭州和郎溪茶园土壤,无论DCD浓度高低,培养第28 d后抑制效果消失;对于所研究的4种茶园土壤,DCD处理在培养期间的抑制效果表现为宜兴土壤安溪土壤杭州土壤郎溪土壤。与DCD相比,无论Nitrapyrin浓度高低,其在培养期间对4种茶园土壤的硝化抑制率接近甚至超过100%,表明Nitrapyrin能完全抑制茶园土壤硝化作用,且抑制有效期达28 d。因此,Nitrapyrin是一种针对茶园土壤比较高效的硝化抑制剂。
[Abstract]:The effects of two kinds of nitrification inhibitors of dicyanide (DCD) and 2-chloro-6-trichloro-6-trichloromethyl (Nitrapyrin) on the soil nitrification process in four typical tea gardens were studied by means of indoor aerobic culture. The test was set with 5 treatments: (1) urea (CK); (2) urea + 2% DCD (2% of the amount of nitrogen applied to the DCD); (3) urea + 10% DCD; (4) urea + 0.27% Nitrapyrin; (5) urea + 0.54% Nitrapyrin. The results showed that the inhibition effect of DCD on the nitrification process in the process of culture was decreased with the increase of the culture time for four test tea garden soils, and the high concentration DCD only showed a stronger inhibition effect than the low concentration DCD only when the 28th day was cultured. After the 28th day of culture, the inhibition rate of DCD in the soil of Anxi and Yixing tea garden still can reach 12. 15% ~ 59. 68%, and for the soil of the tea garden in Hangzhou and Lanxi, the inhibition effect will disappear after the 28th day of culture. The inhibitory effect of DCD on the culture period was shown as the soil of the Lanxi, the soil of Anxi, Yixing, in the soil of Hangzhou. Compared with the DCD, no matter the concentration of the Nitrapyrin, the nitrification inhibition rate of the soil in the four tea gardens is close to or higher than 100% during the culture period, so that the Nitrapyrin can completely inhibit the nitrification of the tea garden soil, and the effective period of the tea garden soil is up to 28d. Nitrapyrin is an efficient nitrification inhibitor for the soil of tea garden.
【作者单位】：陕西省灾害监测与机理模拟重点实验室(宝鸡文理学院地理与环境学院);江苏省农业委员会;土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所);福建省农业科学院土壤肥料研究所;中国农业科学院茶叶研究所;南京师范大学环境学院;
【基金】：国家重点研发计划项目(2017YFD0800103,2017YFD0200106) 国家自然科学基金项目(41671231,41571294,41601016) 江苏省农业科技自主创新资金项目[CX(15)1004]~~
【分类号】：S153;S571.1

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