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利用条件采样法在常熟稻田测定N2O大气垂直通量初步观测结果
PRELIMINARY RESULTS OF N2O FLUX MEASUREMENT IN LOW ATMOSPHERE AT RICE PADDY IN CHANGSHU USING CONDITIONAL SAMPLING
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摘要: 1999年在常熟农业生态站试验稻田于水稻主要生长季, 利用进口的条件采样装置对水稻低层大气N2O的垂直通量进行了观测, 并在2000年做了补充观测。结果如下:各生长季测定的N2O垂直通量值最多出现在0～2.0 mg·m-2·h-1之间;N2O垂直通量平均日变化最大值出现在下午;插秧期和收割后N2O垂直通量是各个生长季中最小的;观测到N2O负通量现象的出现;在稻田用条件采样技术观测到的低层大气N2O垂直通量大于国内用箱式法观测报道的土壤N2O排放通量。Abstract: In the period from 1999 to 2000, the N2O vertical flux in the low atmosphere during the main growing seasons of rice was measured using conditional sampling method over a rice paddy at Changshu Agriculture Ecological Station. The measurements indicate that N2O vertical flux was mainly between 0~2.0 mg·m-2·h-1, and the maximum daily averaged N2O vertical flux was observed in the afternoon. The N2O vertical flux in the transplant rice seedling period and reaping period was minimum among all the growing seasons. In these measurements, the minus N2O vertical flux also observed in some cases. The N2O vertical flux by conditional sampling technique was bigger than that measured by Chamber method reported in some domestic journal papers. The reason of this difference between the two methods needs further study.
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Key words:
- N2O;
- Conditional sampling;
- Low level atmosphere;
- Vertical flux
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图 5 不同年份和不同生长季N2O垂直通量频数分布图
(横坐标A:-4~-3.1, B:-3~-2.1, C:-2~-1.1, D:-1~0.1, E:0~1.0, F:1.1~2.0, G:2.1~3.0, H:3.1~4.0)
表 1 条件采样装置气路有关参数
表 2 样品不同存放时间N2O浓度测试结果
表 3 不同生长季N2O平均垂直通量
表 4 与国外使用条件采样技术N2O垂直通量测量比较结果
表 5 与国内箱式法N2O排放通量测量结果比较
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[1] Businger J A, Delany A C. Chemical sensor resolution required for measuring surface fluxes by three common micrometeorological techniques. Journal of Atmospheric Chemistry, 1990,10: 399～410. doi: 10.1007/BF00115782 [2] Businger J A, Oncley S P. Flux measurement with conditional sampling. Journal of Atmospheric and Oceanic Technology, 1990,7: 349～352. doi: 10.1175/1520-0426(1990)007<0349:FMWCS>2.0.CO;2 [3] Beverland I J, Oneill D H, Scott S L, et al. Design, construction and operation of flux measurement systems using the conditional sampling technique. Atmospheric Environment, 1996, 30(18): 3209～3220. doi: 10.1016/1352-2310(96)00010-6 [4] Oncley S P, Delany A C, Horst T W. Verification of flux measurement using relaxed eddy accumulation. Atmospheric Environment, 1993, 27A: 1～10. http://linkinghub.elsevier.com/retrieve/pii/096016869390409R [5] Zhu T, Wang D, Desjardins R L, et al. Aircraft-based volatile organic compounds flux measurements with relaxed eddy accumulation. Atmospheric Environment, 1999, 33: 1969～1979. doi: 10.1016/S1352-2310(98)00098-3 [6] Zhu T,Pattey E,Desjardins R L,et al. Relaxed eddy-accumulation technique for measuring ammonia volatization. Environ Sci Technol., 2000, 34: 199～203. doi: 10.1021/es980928f [7] Katul G G, Finkelstein P L, Clarke J F, et al. An investigation of the conditional sampling method used to estimate fluxes of active, reactive and passive scalars. Journal of Applied Meteorology,1996, 35: 1835～1845. doi: 10.1175/1520-0450(1996)035<1835:AIOTCS>2.0.CO;2 [8] Pattey E, Desjardins B L, Rochette P, Accuracy of the relaxed eddy-accumulation technique, evaluated using CO2 flux measurements. Boundary-Layer Meteorology, 1993, 60: 341～355. doi: 10.1007%2FBF00712728 [9] Pattey E, Desjardins R L, et al. Impact of density fluctuations on flux measurements of trace gases:implications for the relaxed eddy accumulation technique. Boundary-Layer Meteorology, 1992, 59: 195～203. doi: 10.1007/BF00120695 [10] Zheng Xunhua, Wang Mingxing, et al,N2O and CH4 emissions from rice paddies in Southeast China. Chinese Journal of Atmospheric Sciences,1997, 21(2): 167～174. [11] 郑循华, 王明星, 王跃思, 等. 温度对农田N2O产生与排放的影响. 环境科学,1997, 18(5): 1～5. http://www.cnki.com.cn/Article/CJFDTOTAL-HJKZ705.000.htm [12] 王跃思, 郑循华, 王明星,等. 静态箱法气相色谱法自动检测农田N2O排放. 分析测试技术与仪器,1997, 3(1): 10～15. http://www.cnki.com.cn/Article/CJFDTOTAL-FXCQ199701002.htm [13] 王明星. 大气化学(第二版). 北京:气象出版社,1999. 40～42. [14] Horst T W, Weil J C. How far is far enough? the fetch requirements for micrometeorological measurement of surface fluxes. Journal of Atmospheric and Oceanic Technology, 1994, 11: 1018～1025. doi: 10.1175/1520-0426(1994)011<1018:HFIFET>2.0.CO;2 [15] 王木林, 程红兵, 李兴生, 等. 中国部分清洁地区大气中N2O的浓度. 气象学报,1997, 55(3): 363～370. http://www.cnki.com.cn/Article/CJFDTOTAL-QXXB703.009.htm [16] Khalil M A K, Rasmussen R A, Shearer M J. Emissions of methane, nitrous oxide and other trace gases from rice fields in China. Journal of Geophysical Research, 1998, 103(D19): 25241～25250. doi: 10.1029/98JD01114 [17] 杨文襄, 弁玉静, 钟晋贤, 等. 森林土壤N2O排放通量和东部中国沿海大气中N2O混合比测定. 见:周秀骥主编. 中国地区大气臭氧变化及其对气候环境的影响. 北京:气象出版社,1996. 139～144. [18] 陈冠雄, 黄斌, 黄国宏, 等. 稻田N2O和CH4通量测定及总量估算. 见:王庚辰,温玉璞主编. 温室气体浓度和排放监测及相关过程. 北京:中国环境科学出版社,1996. 343～350. -
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