Differing Trade-Off Patterns of Tree Vegetative Organs in a Tropical Cloud Forest.

Area of Science:

• Plant Ecology
• Functional Trait Ecology
• Forest Ecology

Background:

• The leaf economics spectrum explains plant resource use trade-offs.
• Coordination of functional traits across different plant organs (leaf, stem, root) remains debated.
• Understanding integrated plant economics is crucial for community assembly.

Purpose of the Study:

• To investigate trait coordination across vegetative organs in a tropical cloud forest.
• To determine if the plant economics spectrum is a multi-organ phenomenon.
• To elucidate plant trade-off patterns in resource utilization.

Main Methods:

• Analysis of 13 functional traits (leaf, stem, root) from 84 tree species.
• Utilized standardized major axis (SMA) regression and principal components analysis.
• Examined trait variations and correlations to identify trade-off patterns.

Main Results:

• A "fast-slow" economic spectrum was identified, mainly characterized by leaf and stem traits.
• Leaf nutrient content, specific leaf area, leaf mass per unit area (LMA), wood density, and leaf thickness varied along the primary gradient.
• Root nutrient traits were coordinated with leaf and stem nutrient traits, but root morphology was decoupled from root nutrient traits.

Conclusions:

• Plant resource economics in this tropical cloud forest are primarily defined by leaf and stem traits.
• Nutrient traits exhibit coordination across organs, while morphological traits show partial independence between above- and below-ground components.
• Findings offer insights into species coexistence and community assembly in high-altitude tropical forests.