That also means these trees are absorbing more CO2! Global Warming is a hoax and Climate Change is a religion!
The climate demagogues warn of the unknown!
Perhaps the valuable takeaway is that previous phenological studies focused on the beginning of the growing season (budding), while this study focuses on the end of the growing season (leaf changing).
"The study showed that leaves stayed on trees about 15% longer than they did a century ago ... The implications of the longer growing period are unknown. [Really!] ... But they warned that higher, fluctuating temperatures may also stress trees in ways so far unknown. ...
When we're thinking about a relatively low-cost mitigation strategy, planting a whole bunch of trees that suck CO2 out of the air is a really good strategy, ..."
Please note: The first author of this study, the assistant professor Kellen Calinger, has published only a few papers and her lifetime citation count is 221. She did not even bother to fill out her Google Scholar profile!
Please also note: The historical data of this study is primarily based on the personal notes of one person located in one place!
From the abstract:
"Shifts in the timing of key leaf phenological events including budburst, foliage coloration, and leaf fall have been observed worldwide and are consistent with climate warming. Quantifying changes in growing season length (GSL) because of shifts in both spring and autumn leaf phenology is crucial for modeling annual net ecosystem carbon uptake. However, a lack of long-term autumn phenology datasets has prevented assessment of these growing season level changes. We investigated shifts in growing season length, budburst, foliage coloration, and leaf fall over the past century in seven native hardwood species using a historic leaf phenology dataset collected in Wauseon, OH from 1883–1912 paired with contemporary observations. Using long-term meteorological data, we investigated temperature and precipitation trends over 130 years. Finally, we correlated spring and fall phenophases with monthly temperature and precipitation variables from the twelve months preceding that phenophase using historical meteorological data. We found significant extension of growing season length over the past century in five of the seven study species (ANOVA, p < 0.05) which resulted primarily from delayed foliage coloration rather than from earlier budburst in contrast to the few other studies assessing total GSL change. Our results suggest that most of the leaf phenological studies that investigate only budburst are disregarding crucial information about the end of the growing season that is essential for accurately predicting the effects of climate change in mixed-species temperate deciduous forests."
A century of climate warming results in growing season extension: Delayed autumn leaf phenology in north central North America (open access)
Assistant professor Kellen Calinger-Yoak: "she/her/hers" (Even the Ohio State University can not resist the gender ideology!)
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