Future global productivity will be affected by plant trait response to climate

Area of Science:

• Ecology
• Climate Change Biology
• Plant Ecology

Background:

• Plant traits influence ecosystem productivity and respond to local climate.
• Projected climate change may drive shifts in global plant trait distributions.
• Understanding these shifts is crucial for predicting future primary productivity.

Purpose of the Study:

• To investigate the relationship between key plant traits (Specific Leaf Area, height, seed mass) and climate.
• To project how plant trait distributions will change by 2070 under climate change scenarios.
• To estimate the impact of these trait shifts on global Gross Primary Productivity (GPP).

Main Methods:

• Characterized relationships between plant traits (SLA, height, seed mass), local climate, and GPP.
• Utilized eddy covariance CO2 flux measurements and extrapolated plant trait maps.
• Modeled global GPP distribution under current and projected future plant communities.

Main Results:

• By 2070, lower canopy height, SLA, and seed mass traits are predicted for tropical and arid ecosystems.
• Far northern latitudes are projected to favor taller, woody plants.
• Northern biomes (≥45°N) may see a 31% increase in annual GPP, while tropics could experience a 17.9% decline.

Conclusions:

• Climate change is expected to alter plant trait distributions globally.
• These trait shifts will significantly impact regional and global Gross Primary Productivity (GPP) patterns.
• Northern ecosystems may become more productive, while tropical productivity is projected to decrease.