塑料大棚温光条件与番茄坐果数相关关系的模拟

坐果数是番茄产量形成的重要因素,而植株的坐果潜力在很大程度上受环境因子的影响,特别是温光条件.建立温光条件与番茄坐果数关系的模拟模型,对设施番茄环境量化管理十分必要.试验在春茬大棚番茄生长期定期统计单株坐果数和棚内植株冠层的温度和光照强度,采用多项式回归,以每7 d的总有效积温和有效光合辐射累积的乘积模拟番茄坐果数的变化趋势,建立了2个品种番茄坐果数的模拟模型,并用回归直线和回归估计标准误差RMSE对模拟值和实测值的符合度进行检验.结果表明,两个模型的回归系数均接近于1,达到了较好的拟合,说明以大棚温光为联合驱动因子能较好地模拟番茄坐果数的变化趋势,且准确性高,实用性强.

Simulation of the Relation between Condition of Temperature and Illumination and Fruit Set of Tomato in Plastic Shed

The fruit set of tomato is the important factor in yield conformation and the potential of fruit set which is greatly influenced by environmental factors, especially the temperature and light conditions. Therefore, to set the simulative model between condition of temperature and light in plastic shed and tomato fruit set is quite necessary to quantitative management of environment in the facilities. The experiment was carried out through tomato growth period at the spring cropping season by termly investigating the fruit amount per plant and measuring the temperature and illumination in plant canopy. By making use of polynomial regression, the product of effective temperature accumulation and effective photosynthesis radiation accumulation within 7 days to simulate the trend of tomato fruit set were adopted. The fruit set simulation model of two tomato cultivars grown in plastic shed was built. The regression line and RMSE were finally utilized to check the conformity of the predicted value and the actual value. The result showed that the related coefficient of two models are close to 1, which means better fitting. It is conclued that the driven factors of temperature and illumination condition in plastic shed can better simulate the trend of tomato fruit amount with high accuracy and good practicability.