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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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