N2O and CO2 Emission from an Arable Soil Amended with Glucose and Alanine Addition
Laboratory incubation was conducted to investigate the effect of organic carbon species and nitrogen fertilizer type on the nitrous oxide (N2O) and carbon dioxide (CO2) at soil water content of 100％WHC. Dissolved nitrogen (NH4+-N, NO3--N) and dissolved organic carbon (DOC) were also determined. The results showed the organic carbon species significantly affected the N transformation. For the ammonium fertilization (75 mg N kg-1), maximal N2O-N emission was found in the treatment with alanine addition (5.47 mg kg-1), minimal emission in glucose addition (0.23 mg kg-1), and medial emission in treatment with half alanine plus half glucose (1.87 mg kg-1). The similar change trend of N2O-N emission was also found in the equal rate of nitrate fertilization treatments. These results suggested amino acid-C had the higher bioavailability compared with the glucose. CO2 emission was highest in the treatment with half alanine plus half glucose in both ammonium and nitrate fertilization. Minimal CO2 emission was lowest in glucose addition treatment. Absence of NO3 --N in all treatments after incubation indicated that denitrification was very strong in the experimental condition. Lowest DOC content was determined in the treatment with amino acid addition. N2O emission was higher in nitrate fertilizer addition than in ammonium addition, and CO2 emission was contrary.
greenhouse gas Organic carbon species Nitrogen fertilizer type Nitrous ozide Carbon diozide
Wang Lianfeng Wang Lianfeng
Key Laboratory of Terrestrial Ecological Process Institute of Applied Ecology, Chinese Academy of Sc College of Environmental and Chemical Engineering Dalian Jiaotong University Dalian 116028, China
国际会议
上海
英文
3864-3867
2008-05-16（万方平台首次上网日期，不代表论文的发表时间）