Diminishing warming effects on plant phenology over time

Area of Science:

• Ecology
• Climate Change Biology
• Plant Science

Background:

• Plant phenology, the timing of biological events, is sensitive to climate warming.
• Predicting long-term phenological shifts under sustained warming is crucial for ecosystem understanding.
• Previous studies show varied plant responses to experimental warming.

Purpose of the Study:

• To investigate the long-term effects of experimental warming on plant phenology.
• To determine if phenological responses to warming persist with increased intensity and duration.
• To analyze responses of leaf-out, first flowering, last flowering, and leaf coloring.

Main Methods:

• A meta-analysis of 103 global experimental warming studies.
• Examination of four key plant phenophases: leaf-out, first flowering, last flowering, and leaf coloring.
• Analysis of how warming magnitude and experimental duration influence phenological shifts.

Main Results:

• Warming advanced leaf-out and flowering but delayed leaf coloring in both herbaceous and woody plants.
• Phenological responses leveled off with increased warming in herbaceous plants but scaled with warming in woody plants.
• The impact of experimental warming on plant phenology diminished over time, with decreasing rates of change for specific phenophases.

Conclusions:

• The real-world impact of global warming on plant phenology may diminish over time.
• Long-term warming effects on phenology differ between herbaceous and woody plants.
• Understanding these diminishing responses is key for predicting future ecosystem functions and services.