单 位：
中国科学院南京土壤研究所;南京农业大学资源与环境学院
摘 要：
采用培养试验方法,对南京郊区3对菜地土和水稻土的N2O排放和氮素反硝化损失进行了研究。不加乙炔培养测定土壤N2O排放,加乙炔(10%V/V)培养测定反硝化损失。菜地土为相同类型水稻土改种为蔬菜约20年的土壤。结果表明,在培养0～1d期间,菜地土本身N2O排放通量(5.15～218.37ngN·g-1soil·h-1)均高于相同类型的水稻土(2.50～3.94ngN·g-1soil·h-1)。3对供试土壤中,2个菜地土培养21d排放的N2O总量与反硝化损失总量均显著高于相同类型的水稻土(P<0.05)。3对供试土壤施尿素后反硝化损失均未显著增加。施肥和不施肥处理,土壤N2O排放累积量和反硝化损失累积量随时间t的变化均符合修正的Elovich方程y=bln(t)+a。
译 名：
Losses of Nitrogen by N_2O Emission and Denitrification in Soils Grown with Vegetables
作 者：
JIN Xue-xia1,2 ,FAN Xiao-hui1,CAI Gui-xin1,HUANG Yao2(1.Institute of Soil Sciences,Chinese Academy of Sciences,Nanjing 210008,C hina;2.College of Natural Resources &Environmental Sciences,Nanjing Agricult ural University,Nanjing 210095,China)
关键词：
vegetable soils;paddy soils;N2O emission;denitrificatio n loss
摘 要：
N2O emission and denitrification losses of N in three couples of so i ls grown with vegetables and irrigated rice from Nanjing suburbs were investigat ed in a 21 day incubation experiment. The soils grown with vegetables were conve rted from a field that had been cultivated with rice for about 20 years. N2O emi ssion and denitrification losses were measured without and with acetylene (10% V/V) inhibition technique, respectively. The soils were incubated with 100%fi eld water capacity and urea (100 mg N·kg-1soil) under (28±1) ℃condition . The results showed that N2O emission fluxes in vegetable soils (5.15～218.37 ng N·g-1soil·h) were higher than that in the corresponding paddy soils (2. 50～3.94 ng N·g-1 soil·h-1) during 1 day incubation.N2O emission and de nitrification losses from 2 vegetable soils were significantly higher than those from the corresponding paddy soils during 21 days′incubation(P<0.05. The a mounts of denitrification losses not significantly increased by nitrogen fertili zer applied in the three couples of the soils. Nitrogen source was not a limitin g factor of denitrification losses in this experiment. The relation between N2O emission or denitrification losses and the incubation time, in the three pairs o f soils either with or without applied nitrogen, could be described well by the revised Elovich equation of y=bln(t)+a.
