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From tropics to tundra: global convergence in plant functioning
P B Reich1, M B Walters, D S Ellsworth
1Department of Forest Resources, University of Minnesota, St. Paul, MN 55108, USA.
Summary
Plant traits like leaf structure and lifespan show consistent relationships with growth and carbon exchange across diverse global biomes, revealing convergent evolution in plant functioning.
Area of Science:
- Ecology
- Plant Biology
- Global Change Biology
Background:
- Biomes exhibit vast differences in climate, soil, and evolutionary trajectories.
- Understanding plant functioning across these diverse environments is crucial for ecological modeling.
Purpose of the Study:
- To investigate if plant functional relationships are conserved across diverse biomes.
- To determine the generality of interspecific relationships between leaf traits, carbon gain/loss, and productivity.
Main Methods:
- Analyzed data from 280 plant species across multiple global biomes.
- Examined relationships between leaf traits (lifespan, nitrogen concentration, surface area-to-mass ratio) and plant functions (photosynthesis, respiration, productivity).
Main Results:
- Consistent proportional increases in carbon gain and loss with decreasing leaf lifespan, increasing leaf nitrogen, and increasing leaf surface area-to-mass ratio were observed across all biomes.
- Plant and leaf productivity scaled in constant proportion to leaf lifespan and surface area-to-mass ratio globally.
- Demonstrated convergent evolution in plant functioning irrespective of biome diversity.
Conclusions:
- Plant functional traits exhibit global generality, indicating convergent evolution.
- These findings have significant implications for large-scale vegetation-atmosphere carbon dioxide exchange modeling.