The pace of life for forest trees

Area of Science:

• Ecology
• Forest Science
• Biogeochemistry

Background:

• Tree growth and longevity trade-offs are critical for the global carbon cycle.
• A comprehensive understanding of how these trade-offs vary across global forests is lacking.
• Forest demographic processes significantly influence terrestrial carbon balance.

Purpose of the Study:

• To map life history traits of diverse tree species across the Americas.
• To classify tree life history into distinct demographic functional types.
• To investigate variations in growth-longevity trade-offs and their relationship with environmental gradients and biome characteristics.

Main Methods:

• Mapping of life history traits for numerous tree species across the Americas.
• Classification of tree life pace into four demographic functional types based on traits.
• Analysis of trade-off strength across a temperature gradient and trait diversity across biomes.

Main Results:

• Significant variation in tree life expectancies (e.g., 1.3 to 3195 years for trees of 10 cm diameter).
• Identification of four distinct demographic functional types for trees.
• Emergent patterns in growth-longevity trade-offs along temperature gradients.
• Predictable variation in life history trait diversity across forest biomes.
• A positive relationship between trait diversity and forest productivity.

Conclusions:

• Forest trait diversity is a key driver of productivity and carbon turnover.
• Demographic functional types provide a framework for understanding forest dynamics.
• Pan-latitudinal assessments are crucial for understanding global forest carbon balance mechanisms.