NUMERICAL SIMULATION OF CH<sub>4</sub> EMISSION FROM RICE PADDY FIELDS DURING RECENT 50 YEARS

Liu Jiandong; Zhou Xiuji; Wang Jianlin; Yu Qiang

Vol.12, NO.4, 2001

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2001 > 12(4): 409-418

Liu Jiandong, Zhou Xiuji, Wang Jianlin, et al. Numerical simulation of CH4 emission from rice paddy fields during recent 50 years. J Appl Meteor Sci, 2001, 12(4): 409-418.

Citation:

Liu Jiandong, Zhou Xiuji, Wang Jianlin, et al. Numerical simulation of CH₄ emission from rice paddy fields during recent 50 years. J Appl Meteor Sci, 2001, 12(4): 409-418.

Liu Jiandong, Zhou Xiuji, Wang Jianlin, et al. Numerical simulation of CH4 emission from rice paddy fields during recent 50 years. J Appl Meteor Sci, 2001, 12(4): 409-418.

Citation:

Liu Jiandong, Zhou Xiuji, Wang Jianlin, et al. Numerical simulation of CH₄ emission from rice paddy fields during recent 50 years. J Appl Meteor Sci, 2001, 12(4): 409-418.

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NUMERICAL SIMULATION OF CH₄ EMISSION FROM RICE PADDY FIELDS DURING RECENT 50 YEARS

Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2000-04-09
Rev Recd Date: 2000-10-08
Publish Date: 2001-11-30

Abstract

Abstract

Based on the DNDC model of American, a numerical model for simulating CH₄ emission from rice paddy fields is established. Validation of the model with the observed data shows that the mean relative error is about 15%. The simulation analysis results show that the CH₄ emission is interrelated well with average temperature during rice growth periods. Analysis of CH₄ emission and meteorological factors by using power spectrum indicates that the change of CH₄ emissions has 4-5 year cycles, which is the same as that of temperature. Simple statistical models are given based on the results of the numerical model, which can be applied conveniently to estimate and monitor CH₄ emissions in the rice paddy fields.
- CH₄ emissions;
- Rice paddy fields;
- Agrometeorological numerical model;

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References(12)

Figures and Tables

图 1 CH₄日排放量模拟值与实测值的对比

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图 2 昌德晚稻CH₄历年排放与气象因子间的关系

(a) 生长期CH₄排放量及平均气温 (—: CH₄排放量; …: 平均气温) (b) 生长期总辐射及降水量 (—: 总辐射; …: 降水量)

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图 3 CH₄排放与温度变化趋势比较

(—: CH₄排放量; …: 温度)

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表 1 稻田CH₄排放量与相应生长期气象因子的相关系数

表 2 杭州地区早稻CH₄排放与相应气象因子的功率谱分析

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