施氮水平对稻田土壤温室气体排放的影响

发布时间：2018-06-21 23:09

本文选题：氮肥 + 温室气体　；参考：《农业工程学报》2016年S2期

【摘要】：该研究以江西稻田为研究对象,设置了不施氮对照(N0)、减氮40%(N1)、常规施氮(N2)、增氮50%(N3)等4个处理,采用静态箱-气相色谱法研究了稻田温室气体(N_2O、CH4、CO_2)的排放通量和速率,并计算了温室气体排放强度及全球增温潜势。结果表明:在晚稻栽培过程中,N_2O和CO_2的排放通量均出现3次峰值,且都表现为增施氮肥处理高于其他处理,而CH4排放通量仅出现一次峰值;N0、N1、N2的N_2O和CO_2的总排放量无显著差异(P0.05),但N3处理下的N_2O和CO_2的排放量显著高于其他处理(P0.05);与对照比,N1、N2和N3的CH4总排放量分别提高了58.70%、69.63%、96.15%,净增温潜势分别增加了22.34%、25.34%、52.92%;N3的温室气体排放强度最高,达1.12kg/kg,显著高于N1和N2。
[Abstract]:In this study, four treatments (N 0, N 0, N 1, N 2 and N 3) were used to study the emission fluxes and rates of greenhouse gas (N _ 2O Ch _ 4C _ 2) in the paddy fields of Jiangxi Province. The results showed that the greenhouse gas emissions from paddy fields were controlled by N _ 0, N _ 4 by N _ 2, N _ 2 by conventional N _ 2 and N _ 3 by 50% N _ 3. The fluxes and rates of greenhouse gas emissions from paddy fields were studied by static box-gas chromatography. The greenhouse gas emission intensity and global warming potential are calculated. The results showed that the emission fluxes of C _ 2O and CO _ 2 all showed three peaks in late rice cultivation, and all of them were higher than those of other treatments. However, there was no significant difference in the total emissions of N2O and CO2 between N0 and CO2 in CH4 emission fluxes (P 0.05), but the emissions of NSCO and CO2 in N3 treatment were significantly higher than those in other treatments (P0.05), and the total CH4 emissions of N1N _ 2 and N _ 3 were increased by 58.70 ~ (69. 63) ~ 96.15T, respectively, compared with those of the control (P0.05), but the total emission of N2O and CO2 was significantly higher than that of other treatments (P0.05). The net warming potential has increased 22.34% and 25.34% respectively. The greenhouse gas emission intensity of 52.92% N3 is the highest. At 1.12 kg / kg, significantly higher than N1 and N2.
【作者单位】：江西农业大学生态科学研究中心;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;江西省鹰潭市余江县农科所;
【基金】：土壤与农业可持续发展国家重点实验室开放课题(Y412201413) 国家科技支撑计划课题“鄱阳湖生态经济区绿色高效循环农业技术集成与示范”(2012BAD14B14)
【分类号】：S143.1;S154.1

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