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An Observational Study of Methane Emission of Rice Paddies in Zhenjiang Lin’an
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摘要: 1990年7—9月，在浙江临安（30°14＇N，119°42＇E），利用微气象学（梯度廓线）法及箱式技术对水稻田CH4排放通量进行了同步观测，取得了中稻整个生长期内的CH4排放资料。文章仅对箱式技术的观测结果作了介绍与分析。观测发现在整个灌溉期内，稻田CH4释放率为3.67—16.14 mg/m2·h，均值为10.58 mg/m2·h。CH4排放的季节变化明显，日变化也同样很明显。另外还发现，CH4排放通量与水（地）温及其他气象因素，如强风、阴雨等有关。与梯度廓线法的观测结果不同，箱式观测到的CH4排放通Abstract: Methane (CH4) flux from rice paddies was observed in Lin’an (34°14′N, 119°42′E) of Zhejiang province by using the static chamber during July through September 1990. Methane flux in the range of 3.67—16.14mg/m2·h was obtained during the irrigating period. The averaged methane emission flux is 10.58mg/m2·h. The CH4 release rates are shown that there is a strong diurnal variation with a maximum value at night or in the early morning and a minimum value in daytime. A seasonal variation of CH4 flux from rice paddies exhibites a rapid rising from rice plant tilling to heading periods. Then, CH4 emission decreases with water level in the rice paddies. In addition, methane emission is also related to the natural conditions, such as temperature, wind speed and rain
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Key words:
- Methane emission;
- Rice paddies;
- Observational study
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