PRELIMINARY RESULTS OF N<SUB>2</SUB>O FLUX MEASUREMENT IN LOW ATMOSPHERE AT RICE PADDY IN CHANGSHU USING CONDITIONAL SAMPLING

Ding Guoan; Liu Jingmiao; Yan Peng; Wang Muling; Wang Shufeng; Cheng Hongbing; Meng Zhaoyang; Cheng Yanjie; Lu Chang gui; Yu Haiqing; Wen Deyong; Xu Jing

Vol.15, NO.4, 2004

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2004 > 15(4): 456-467

Ding Guoan, Liu Jingmiao, Yan Peng, et al. Preliminary results of N2O flux measurement in low atmosphere at rice paddy in Changshu using conditional sampling. J Appl Meteor Sci, 2004, 15(4): 456-467.

Citation:

Ding Guoan, Liu Jingmiao, Yan Peng, et al. Preliminary results of N₂O flux measurement in low atmosphere at rice paddy in Changshu using conditional sampling. J Appl Meteor Sci, 2004, 15(4): 456-467.

Ding Guoan, Liu Jingmiao, Yan Peng, et al. Preliminary results of N2O flux measurement in low atmosphere at rice paddy in Changshu using conditional sampling. J Appl Meteor Sci, 2004, 15(4): 456-467.

Citation:

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PRELIMINARY RESULTS OF N₂O FLUX MEASUREMENT IN LOW ATMOSPHERE AT RICE PADDY IN CHANGSHU USING CONDITIONAL SAMPLING

Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2002-12-18
Rev Recd Date: 2004-02-04
Publish Date: 2004-08-31

Abstract

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.
- N₂O;
- Conditional sampling;
- Low level atmosphere;
- Vertical flux

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References(18)

Figures and Tables

图 1 测点周围环境

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图 2 条件采样装置

(a) 示意图, (b) 气路图

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图 3 1999年水稻不同长生期感热通量平均日变化

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图 4 1999年7月14日04:00~24:00垂直风速脉动值标准差日变化

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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)

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图 6 1999年各生长季N₂O垂直通量平均日变化

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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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