【摘要】 在综合已有作物模拟模型优点的基础上,构建了基于生态生理过程的棉花光合生产与干物质积累动态模拟模型。模型中引用了高斯积分法计算冠层每日的PAR总截获量和光合同化量,考虑了PAR的日变化规律和太阳高度角变化对直射PAR消光系数的影响,在量化直射辐射对光合作用贡献的同时,分别计算了天空散射辐射、冠层和土壤散射辐射的强度。模型充分考虑了温度、生理年龄、氮素、水分等因子对光合作用和呼吸作用的影响。利用不同遗传类型品种、不同管理方式下的棉花干物质积累动态对模型进行了检验,结果表明模拟值与观测值吻合度较好,模型不仅具有较强的机理性而且具有较高的预测性和实用性。更多还原

【Abstract】 A process based model for cotton photosynthesis and dry matter dynamic accumulation was developed by integrating certain advantages in current simulation models. The model introduced Gaussian integration method for computation of daily total canopy PAR interception and assimilation, considered not only PAR daily course but also the influence of direct PAR extinction coefficient by daily solar height course. The model calculated photosynthesis based on both direct radiation and diffusion radiation from sky, canopy and soil. The effectiveness of temperature, physiological age, nitrogen and water status on photosynthesis and respiration are fully quantified. The validation of model for dry matter accumulation with field experiments of different genotype and management indicated good fit between the simulated and observed data. Therefore, this model is strong on both mechanism and practicability. 更多还原