Functional trait response to aridity based on leaf trait network analysis in the Hexi Corridor, China

Area of Science:

• Ecology
• Plant Science
• Environmental Science

Background:

• Aridity intensifies, significantly impacting plant leaf functional traits and creating environmental filters.
• Limited research exists on leaf trait tradeoff strategies and separation along aridity gradients.
• This study investigates 14 plant leaf traits in response to long-term aridity in China's Hexi Corridor.

Purpose of the Study:

• To examine the impact of long-term aridity on plant leaf traits.
• To understand leaf trait tradeoff strategies and trait separation under increasing aridity.
• To identify the effects of aridity and functional diversity on leaf nutrient concentration.

Main Methods:

• Construction of a leaf trait network (LTN) to analyze trait strategies.
• Correlation analyses to determine trait relationships and dominance of the mass ratio hypothesis.
• Structural equation modeling (SEM) to assess direct and indirect effects of aridity and functional diversity.

Main Results:

• Leaf trait network analysis revealed trait separation, poor trait synergy, and low resource utilization.
• Aridity positively correlated with leaf relative water content (RWC) and leaf phosphorus, negatively with leaf nitrogen content (LNC).
• SEM indicated LNC is directly influenced by aridity, RWC, leaf carbon, and plant height; phosphorus by aridity and functional dispersion.

Conclusions:

• Increasing drought intensity disrupts plant trait coordination, primarily through nutrient trait separation.
• Understanding trait tradeoffs along aridity gradients is crucial for comprehending plant adaptation and community function changes.