Institute of Food Science, Zhejiang Forestry Academy, Hangzhou, 310023, China.
Key Laboratory of State Forestry Administration on Forest Food Resources Utilization and Quality Control, Hangzhou, 310023, China.
Int J Biometeorol. 2020 Jan;64(1):17-27. doi: 10.1007/s00484-019-01787-x. Epub 2019 Sep 14.
Although it is well-known and established that light plays important roles in plant development, up to now, there is no substantial improvements in how to deal with the light factor of spring phenology under natural condition. By monitoring the local meteorologic data and mature dates of two types (male and female) of flower from four pecan cultivars during 9 years, it was found that the complementary pattern of growing degree day and sunshine duration helped to maintain a threshold of driving force related to the maturity of pecan flower during 9 years. A novel photothermal time model based on the linear combination of growing degree day and sunshine duration was then proposed and validated to interpret the variance of mature dates of pecan cultivars. Comparative analysis showed that the new model had made extremely significant improvements to the traditional thermal time model. In addition, this model introduced the conversion coefficient K, which quantified the effect of light on the flowering drive, and revealed the differences of base temperature among cultivars. This was the first time that sunshine duration instead of photoperiod was adopted to develop into a verified model on spring phenological event of tree species. It will help to model the spring phenologies of other tree species more reasonably.
虽然众所周知，光在植物发育中起着重要作用，但迄今为止，在如何处理自然条件下的春季物候的光因子方面，并没有实质性的改进。通过监测 9 年来 4 个山核桃品种的当地气象数据和两种（雄性和雌性）花的成熟日期，发现生长度日和日照时间的互补模式有助于维持与山核桃花成熟相关的驱动力阈值。然后提出并验证了一种基于生长度日和日照时间线性组合的新型光热时间模型，以解释山核桃品种成熟日期的变化。比较分析表明，新模型对传统的热量时间模型有了显著的改进。此外，该模型引入了转换系数 K，它量化了光对开花驱动的影响，并揭示了品种间基础温度的差异。这是首次采用日照时间而不是光周期来开发成验证过的树种春季物候事件模型。它将有助于更合理地模拟其他树种的春季物候。
