温室小型西瓜光合生产与干物质积累模拟模型

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,根据温室小型西瓜的试验数据,确 定有关模型参数,建立了温室小型西瓜光合生产和干物质积累模拟模型,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。模型利用有效积温对叶面积指数LOGISTIC方程建立叶面积指数动态模型,同时 光合作用模型还引用简便有效的高斯积分法计算冠层每日的总同化量,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,确定了温室小型西瓜的 碳水化合物转化成干物质的系数CF。通过不同品种、不同播期下的干物质积累动态的模型检验,表明模型有较强的 精确性、机理性和实用性。

Simulation model for photosynthesis and dry matter accumulation of watermelon in greenhouse

According to experimental data, the watermelon photosynthesis and dry matter dynamic accumulation model in greenhouse was developed by determining model parameters based on the greenhouse crop simulation models, in which the leaf area index dynamic formation, photosynthesis and dry matter accumulation formation submodels are considered.The leaf area index submodel was developed by LOGISTIC equation of effective accumulated temperature and leaf area index. The photosynthesis submodel introduced Gaussian integration method for the total daily canopy assimilation, considering not only effective PAR daily course but also the influence of canopy reflectivity coefficient, in addition conversion factor of carbohydrate and dry matter were quantified. The validation of model for dry matter accumulation with experiments of different genotypes and sowing date indicated good fit between the simulated and observed data. Therefore, this model was of high accuracy , mechanism, and practicability.