Thirty Years of Spring – Phenology: It’s supposed to offer variation in Spring flowering times each year. Over a long period of time like 30 years, however, the phenology of blooming plants provides an unusually different result–uniformity. This assumption was corroborated by a 30 year Minnesota study. Let us discuss what is phenology at first.
Phenology is “the study of the correlation between climate and periodic biological phenomena.” In the Minnesota study, the specific definition was Leaf bud development and the flowering of a select group of trees and shrubs located on or in the neighborhood of the University of Minnesota St. Paul campus. The specialty of this study is that the data were recorded by the same viewer throughout the 30 years and makes it more reliable.
The results exhibited great differences between years. But when observed in 10-year increments, little variation was perceived. As per this study, the minor and uneven change in average dates from decade to decade provides evidence that these actions have not been occurring consistently earlier or later than the recent years.”
Another set of data accumulated over a sixty-three years period showed the average date for “Pink Bud Stage” was May 7, exactly almost the same as the forty years average date, May 7 and 8. The same was correct for “Apple Petal Fall.” Both sets of statistics show May 22 or 23.
These records are more than just passing interest, have been used by entomologists to schedule field works, to spread pesticide, and to educate learners. Beekeepers can also average their observations over many years to predict when serious management techniques might be necessary.