摘要： 通过利用原状土柱研究牧草生态系统中施用硝化抑制剂对氮素的转化，研究结果表明，在施用相同氮肥的基础上增施硝化抑制剂DCD可以提高牧场的产草量，增产可以达到30%~50%。土壤淋溶液中的NO₃^--N浓度，受施肥量的影响，包括有机肥在内，氮肥施用量越大，土壤淋溶液中的浓度就越高。施用硝化抑制剂后降低土壤淋溶液中NO₃^--N的浓度，NO₃^-N的浓度由220mg/L下降到50~70mg/L，氮素的损失由总氮量40.6%降到10%，N₂O的排放高峰从560g/hm².降到48g/hm²，高峰期的排放量可以减少11倍。

关键词: 养牛场废物, 氮肥, 硝化抑制剂, 硝酸盐淋溶, N₂O排放

Abstract: Using the lysimeter to study the NO₃^--N leaching and N losing in grass agroecosystem,the results showed that nitration inhibitor DCD could increase grass yield 30%-50%.The more nitrogen the more leaching nitrate in the soil.The NO₃^--N leaching of concentration affected by both of the organic fertilizer and inorganic fertilizer.The NO₃^--N concentration was declined from 220mg/L to 50-70 mg/L in the top leaching periods while applied DCD.The losing nitrogen by NO₃^--N dropped from 40.6% of the total nitrogen to 10% after applied DCD.N₂O emission was declined from 560g/ ha to 48g/ha e.g,it reduced 11 times than that without DCD application.

Key words: Dairy effluent, Nitrogen, Nitration inhibitor,, NO₃^{--N leaching,} N²O emission

中图分类号: 

• S153