In a nutshell
Temperature strongly influences when plants leaf out in spring and when they lose their leaves in autumn. However, not all species respond to temperature in the same way. Species traits, like leaf size or root length, may affect how sensitive plants are to warming temperatures. Understanding these patterns could help scientists predict how entire plant communities will respond to climate change.
To study the role of species traits, researchers compiled results from more than a hundred warming experiments that measured how temperature affected the timing of leaf out and leaf fall. They also analyzed observational data from Nature’s Notebook and a similar monitoring network in China. Both sets of analyses found that plants with thinner leaves and higher nutrient concentrations were more sensitive to climate change. For these plants, warming temperatures led to earlier leaf out and later leaf fall, resulting in longer growing seasons. Warming temperatures had less of an effect on plants with thicker leaves and lower nutrient concentrations.
Many studies predict that the timing of leaf out and leaf fall will shift under climate change, but few analyses have taken plant traits into account. Results of this study will allow researchers to make accurate predictions about how growing seasons might change with warming temperatures – not just for well-studied species, but for a wide range of species based on leaf traits.
What is special about this study?
The researchers in this study used two independent sources of data to investigate the same question: do particular leaf traits make species more or less sensitive to temperature? Analyses of both datasets pointed to the same result, that warming temperatures are likely to extend the growing season to a greater extent in plant species with thinner leaves and higher nutrient concentrations. These findings will enable researchers to accurately predict how climate change could affect plant productivity and carbon cycling.
What does this mean for YOU?
Warming experiments have provided critical insights about plant phenology, but they are expensive and can only include a limited number of species. In contrast, Nature’s Notebook observers collect data on hundreds of species across the country. Researchers in this study focused on Nature’s Notebook observations from plants that had been monitored for at least five years. You can help researchers by contributing to these long-term data sets and documenting how the timing of leaf out or leaf fall varies from year to year in your plants.
Citation:
Xiong, K., P. B. Reich, P. Ciais, C. Lu, H. Zhou, X. Wang, J. Peñuelas, C. Wu, and H. Liu. Acquisitive plants exhibit stronger phenological shifts in response to warming: insights from meta-analysis and long-term monitoring. Nature Communications 17:4430. https://doi.org/10.1038/s41467-026-70474-4