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Updated: Jan 16, 2026

A Simple Protocol for Mapping the Plant Root System Architecture Traits
Published on: February 10, 2023
Whole-plant trait networks reveal elevational optimization of resource strategies: integration drives distribution in
Zuhua Wang1,2, Haibo Li3, Chuandong Yang1,2
1College of A&F Engineering and Planning, Tongren University, Tongren, Guizhou, China.
Introduction:
Plant trait networks (PTNs) reveal integrated adaptation strategies, but how elevational stress gradients reshape PTN architecture and influence species distribution remains unclear.
Methods:
We analyzed 14 leaf, stem, and root traits across 37 woody sapling species along a 600 - 2200 m elevational gradient on Mt. Fanjingshan, China. We linked PTN metrics (connectivity, modularity, hub traits) to environmental drivers and species distributions.
Results:
PTN integration increased with elevation, evidenced by declining average path length (R² = 0.93, P = 0.008) and graph diameter (R² = 0.92, P = 0.011), indicating intensified trait coordination at higher elevations. Modularity peaked at mid-elevations (unimodal pattern: R² = 0.97, P = 0.017), reflecting heightened trade-offs between stress tolerance and resource acquisition. Crucially, litter depth and soil phosphorus-not climate-were the primary drivers of PTN structure, jointly explaining 84.2% of variation (P = 0.011) and promoting integration via root-hub traits (specific root length, specific root area). Species distribution was strongly correlated with PTN efficiency (84.8% explained variance, P = 0.038), driven by reduced graph diameter, greater litter depth, and lower temperature.
Discussion:
These findings indicate that elevational stress selects for highly integrated PTNs optimized by belowground trait hubs and microhabitat buffering, highlighting litter-soil interactions as critical mediators of species distributions under climatic constraints.
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