Effects of Nitrogen Application on N2O Flux from Fluvo-Aquic Soil Subject to Freezing-Thawing Process

文献类型： 外文期刊

第一作者： Wang Feng

作者： Wang Feng;Gao Shang-bin;Zhang Ke-qiang;Ba Li-jing;Huang Zhi-ping;Mi Chang-hong;Li Hai-bo

作者机构：

关键词： freezing-thawing process;NH4+-N;NO3--N;amide-N, N2O flux

期刊名称：AGRICULTURAL SCIENCES IN CHINA （ 影响因子：0.82； 五年影响因子：0.997 ）

ISSN： 1671-2927

年卷期： 2010 年 9 卷 4 期

页码：

收录情况： SCI

摘要： A lab-incubation experiment was conducted to investigate the effects of different forms of nitrogen application (ammonium, NH4(+)-N, nitrate, NO3--N; and amide-N, NH2-N) and different concentrations (40, 200 and 800 mg L-1) on N2O emission from the fluvo-aquic soil subjected to a freezing-thawing cycling. N2O emission sharply decreased at the start of soil freezing, and then showed a smooth line with soil freezing In subject to soil thawing, N2O emission increased and reached a peak at the initial thawing stage The average N2O emissions with addition of NH4+,-N, NO3--N and NH2-N are 119.01, 611 61 and 148. 22 mu g m(-2) h(-1), respectively, at the concentration of 40 mg L-1, 205 28, 1 084.40 and 106 13 mu g m(-2) h(-1) at the concentration of 200 mg L-1, and 693 95, 1 820 02 and 49 74 mu g m(-2) h(-1) at the concentration of 800 mg L-1 The control is only 100 35 mu g m(-2) h(-1), N2O emissions with addition of NH4+-N and NO3--N increased with increasing concentration, by ranging from 17.49 to 425 67% for NH4+-N, and from 563.38 to 1 458 6% for NO3--N compared with control There was a timelag for N2O emission to reach a steady state with an increase of concentration In contrast, by adding NH2-N to soil. N2O emission decreased with increasing concentration. In sum, NH4+-N or NO3--N fertilizer incorporated in soil enhanced the cumulative N2O emission from the fluvo-aquic soil relative to amide-N. This study suggested that ammonium and nitrate concentration in overwintering water should be less than 200 and 40 mg L-1 in order to reduce N2O emissions from soil, regardless of amide-N.

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