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Fine-root trait variation in temperate trees follows arc-shape pattern along deep soil profiles.
Katrin Pietig1,2, Christoph Leuschner1, Heinz Coners1
1Plant Ecology and Ecosystems Research, Albrecht-von-Haller-Institute for Plant Sciences, University of Göttingen, Göttingen, 37073, Germany.
The New Phytologist
|May 14, 2026
Summary
Tree roots show distinct strategies at different soil depths. Topsoil and deep subsoil roots are acquisitive, while intermediate roots are conservative, impacting resource uptake.
Area of Science:
- Plant Ecology
- Soil Science
- Forest Ecology
Background:
- Plant roots are crucial for water and nutrient acquisition.
- Understanding fine-root trait variation in deep soil profiles is limited.
Purpose of the Study:
- To quantify vertical fine-root trait variation in four temperate tree species.
- To investigate the functional implications of root trait variation with soil depth.
Main Methods:
- Excavated fine roots to 380 cm depth in German sandy soils.
- Quantified morphological and functional traits (e.g., specific root length, diameter).
- Related root traits to soil properties and resource availability.
Main Results:
- Fine-root traits exhibited a consistent arc-shaped pattern with depth across species.
- Topsoil and deep subsoil roots showed acquisitive traits (high SRL, N content, SRTA).
- Intermediate subsoil roots displayed conservative traits (thicker, denser tissues).
Conclusions:
- Trees exhibit vertically contrasting resource-use strategies based on root trait plasticity.
- Fine-root functional differentiation occurs across deep soil layers.
- Incorporating vertical root plasticity into models can improve predictions of resource uptake and carbon cycling.
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