油菜物质生产与积累的模拟模型

A Simulation Model of Photosynthetic Production and Dry Matter Accumulation in Rapeseed

油菜物质生产与积累是由单位绿色叶面积和群体绿叶面积光合作用的结果,单位叶面积的光合作用采用负指数方程描述,群体则采用高斯积分法模拟每日油菜冠层总同化量。扣除呼吸消耗与物质转化损耗形成群体生物量。同时考虑了温度、生理年龄对单位叶面积光合作用的影响以及水分、CO2浓度、氮素丰缺对群体干物质积累的影响。采用不同播期、不同品种、不同密度的试验对模型预测的地上部干物重进行验证,结果表明模拟值与实测结果吻合很好,相对误差小于7％。

Dry matter production and accumulation in rapeseed were results from the photosynthesis of unit and colonial green leaf area, and the photosynthesis rate of unit green leaf area was described by negative exponential function, the daily total canopy photosynthetic rate was simulated by Gauss integration, and biomass was subtracting respiration and transformation from it. In the meantime, the effects of daily temperature, plant age, water, CO2 concentration and nitrogen deficit on photosynthesis rate of unit and colonial green leaf area were taken into consideration. The relationship of plant critical and minimum nitrogen content to physiological development time was also established. Tests of different sowing date, densities, variety treatments were carried out to validate the simulated results, which showed the relative errors of the predicted to the observed biomass were less than 7%.