Model Research on the Effect of Surface Film on Ammonia Volatilization from Rice Field |
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| Authors: | ZHUANG Shun-yao YIN Bin ZHU Zhao-liang |
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| Institution: | Institute of Soil Science, Chinese Academy 9f Sciences, Nanjing 210008, P.R. China |
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| Abstract: | Pan and field experiments were conducted to investigate the effect of surface film on ammonia volatilization from water and paddy soil. The results showed that the addition of the surface film on floodwater reduced the rate of ammonia volatilization, however, the reduction of the latter varied greatly with its rates of addition. Jayaweera-Mikkelsen ammonia volatilization model with the introduction of a parameter Kf, a relative measure of the resistance of the surface film on ammonia volatilization, was used to elucidate the effectiveness of the surface film on lowering ammonia volatilization. The Kf value was calculated from the results obtained in the pan experiment with different rates of surface film addition. With the modified model and the optimized Kf value, the effects of the surface film in reducing ammonia volatilization under different environmental conditions were simulated and analyzed. However, it was found that the simulation was not satisfactory in the field experiment and the parameter Kf should be further tuned so as to improve the simulation and to optimize the addition rate of the surface film in field conditions. |
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| Keywords: | Surface film Ammonia volatilization J-M model Coefficient of resistance |
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