Comparison of different methods for the measurement of ammonia voltatilization after urea application in Henan Province, China

文献类型： 外文期刊

第一作者： Pacholski, Andreas

作者： Pacholski, Andreas;Cai, Gui-Xin;Fan, Xiao-Hui;Ding, Hong;Chen, Deli;Nieder, Rolf;Roelcke, Marco

作者机构：

关键词： ammonia loss;integrated horizontal flux method;Drager-Tube Method;N-15;AGRICULTURAL CROPLAND;ATMOSPHERIC AMMONIA;VOLATILIZATION;EMISSION;EXCHANGE;SAMPLER;FIELD;FLUX;SOIL;FERTILIZERS

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE （ 影响因子：2.426； 五年影响因子：3.029 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Ammonia losses following urea fertilization of maize and winter wheat were determined in field trials carried out at Fengqiu Experimental Station in the North China Plain in 1998 and 1999. Four experiments were carried out using two simplified micrometeorological integrated horizon tal flux methods [IHF(L) and IHF(S)], a chamber method (calibrated Drager-Tube Method DTM) and the N-15-balance method using N-15-labeled urea. The IHF(L) was taken as the reference method. Both IHF methods showed good agreement in one experiment only, while the IHF(S) overestimated as well as underestimated cumulative ammonia losses compared to IHF(L) in the other experiments (deviation ranged from 12.5% to 64% based on cumulative ammonia losses). Regression analysis of the fluxes showed that in particular different sensitivities of the samplers to wind speed accounted for the discrepancies observed. The IHF(L) and the DTM flux curves were very similar in three experiments, while the values obtained with DTM considerably deviated from IHF(L) results in one experiment. A comparison with apparent fertilizer-N losses determined by the N-15-labeling approach showed that ammonia volatilization was the major pathway of fertilizer-N loss in this study.

分类号： S1

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