| 光谱学与光谱分析 |
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| Use of Open-Path TDL Technique and the Backward Lagrangian Stochastic Model to Monitor Ammonia Emission from Summer Maize Field |
| YANG Wen-liang1, 3, ZHU An-ning1*, ZHANG Jia-bao1, ZHANG Yu-jun2, HE Ying2, WANG Li-ming2, CHEN Xiao-min3, CHEN Wen-chao1 |
1. Fengqiu Agro-ecological Experimental Station, State Key Laboratory of Soil and Sustainable Agriculture (Institute of Soil Science, Chinese Academy of Sciences), Nanjing 210008, China
2. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
3. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China |
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Abstract The backward Lagrangian stochastic dispersion model in conjunction with open-path tunable diode absorption spectroscopy was used to quantify ammonia emissions from farmland based on the high-temporal resolution data, aiming to provide innovative achievements to diagnose patterns of ammonia flux. The results indicate that the bLS dispersion technique using open-path lasers to measure atmospheric ammonia concentrations is suitable for determining ammonia emissions from farmland continuously, especially for characterizing diurnal characteristics of NH3 emissions. The ammonia emissions have a significant diurnal pattern with two emission peaks from urea applied to maize on a calcareous sandy loam fluvo-aquic soil in the North China Plain. We believe that the first peak starting at approximately 9:00 am is due to NH3 absorbed by the dew re-emission at night as the dew evaporates. The maximum of ammonia flux at 14:00 corresponds to the peak of soil temperature and solar radiation. The ammonia emission increased rapidly, but the duration of emission peaks lasted approximately 4 d. Cumulative NH3 emission was 25.3% of the applied N over the entire measurement period. The NH3 emissions measured with bLS dispersion technique and venting method had certain difference.
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Received: 2012-05-21
Accepted: 2012-08-28
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Corresponding Authors:
ZHU An-ning
E-mail: anzhu@issas.ac.cn
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