温室番茄光合生产和干物质积累模型的建立

本文在借鉴国内外温室蔬菜作物光合生产和干物质积累模拟模型的基础上,根据温室番茄的试验数据,确定参数ε和参数PLMX,分别为0.45kgCO2ha-2h-1/(Jm-2s-1)、30kgCO2ha-2h-1,从而建立了温室番茄光合生产和干物质积累模拟模型。建立的模型包括叶面积指数动态模型、光合生产动态模型和干物质积累动态模型。模型利用生长度日对叶面积指数LOG ISTIC方程建立了叶面积指数动态模型LAI=3.6/(1 EXP(13.131731-0.0141×GDD 0.000001×GDD2));应用简便有效的高斯积分法计算冠层每日的总同化量,建立了光合作用模型。该模型既考虑了光合有效辐射的日变化规律,又考虑了太阳高度角的变化对冠层反射率的影响,此外,模型还考虑了温度对呼吸作用的影响。通过不同品种、不同播期下的干物质积累实测值对模型进行检验,结果表明模型有较强的精确性。

SIMULATION OF PHOTOSYNTHESIS AND DRY MATTER PRODUCTION IN GREENHOUSE TOMATO

Greenhouse tomato photosynthesis and dry matter dynamic accumulation model was developed based on the existing greenhouse crop simulation models.The model consists of leaf area index dynamic formation,photosynthesis and dry matter accumulation formation submodels.The leaf area index submodel was developed by LOGISTIC equation LAI=3.6/(1 EXP(13.131731-0.0141*GDD 0.000001*GDD2)) of growing degree days and leaf area index.The photosynthesis submodel introduced Gaussian integration method for the total daily canopy assimilation,considered not only effective PAR daily course but also the influence of canopy reflectivity coefficient were quantified.The validation of model for dry matter accumulation with experiment data of different genotypes and sowing date showed that the simulated results agreed well with the observed data.