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本文将农田微气象模式与冬小麦冠层光合模式进行耦合 ,建立了一个具有较强机理的冬小麦冠层 CO2 分布廓线模式。冠层光合模式中考虑了气孔对叶片光合的调节作用 ,具有明确的生物学意义。实测资料验证表明 :模式可以较准确地模拟拔节期冬小麦冠层 CO2 分布状况 ,平均相对误差为 6 .4 7%。数值分析表明 :当冬小麦冠层风速为 1m/ s时 ,CO2 廓线弯曲最为明显 ,随着风速加大 ,CO2 廓线弯曲程度变小 ;CO2 浓度升高后风速对廓线影响的基本规律没有发生改变 ,但是冠层中 CO2 浓度差将进一步加大。
In this paper, the micro-meteorological model of farmland was coupled with the canopy photosynthetic model of winter wheat to establish a canopy CO2 profile profile with strong mechanism. The photosynthetic model of the canopy accounts for the regulatory role of stomata on leaf photosynthesis, with clear biological significance. The experimental results show that the model can accurately simulate the distribution of CO2 in the canopy of winter wheat at jointing stage, with an average relative error of 6.74%. Numerical analysis shows that when the canopy wind speed of winter wheat is 1m / s, the curve of CO2 profile is the most obvious. As the wind speed increases, the curve of CO2 profile becomes smaller. The basic law of the effect of wind speed on profile after the increase of CO2 concentration is not Change, but the CO2 concentration difference in the canopy will further increase.