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Updated: May 23, 2025

Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil
Published on: September 1, 2020
Tree root nutrient uptake kinetics vary with nutrient availability, environmental conditions, and root traits: a
Matthew E Craig1, Anthony P Walker1, Colleen M Iversen1
1Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Tree root nutrient uptake is highly variable, influenced by factors like soil warming and root traits. Understanding these dynamics is crucial for forest ecosystem models and predicting plant responses to environmental change.
Area of Science:
- Forest Ecology
- Plant Physiology
- Biogeochemistry
Background:
- Root nutrient uptake is key to forest carbon and nutrient cycling.
- Understanding tree root nutrient uptake physiology is limited, lagging behind aboveground studies.
- Accurate models of forest ecosystems require better data on root nutrient dynamics.
Purpose of the Study:
- To compile a global dataset of tree root nutrient uptake capacity and affinity.
- To identify global patterns in nutrient uptake traits across tree species.
- To evaluate how environmental drivers and root traits influence nutrient uptake.
Main Methods:
- Compiled a global dataset of published nutrient uptake capacity and affinity values.
- Included data for ammonium, nitrate, and phosphate uptake for 77 tree species.
- Analyzed global patterns and responses to environmental factors and root traits.
Main Results:
- Nutrient uptake capacity and affinity varied significantly across species and nutrients.
- Tropical forests are underrepresented in the current dataset.
- Nutrient uptake decreased with nutrient enrichment but increased with soil warming and mycorrhizal colonization.
- Thinner roots were associated with higher nutrient uptake capacity and affinity.
Conclusions:
- Tree root nutrient uptake traits are highly variable globally.
- Environmental drivers like warming and nutrient availability significantly impact uptake.
- Root traits and life-history strategies are linked to nutrient uptake efficiency.
- Further research is needed, especially in underrepresented tropical regions.
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