Skip to main content
Dryad

A global dataset on paired leaf Na and root Na contents

Data files

Mar 19, 2025 version files 89.88 KB

Abstract

Aim: Plants allocate sodium (Na) to leaves and roots as an adaptation to salinity and drought, potentially modulating herbivory and ecosystem carbon cycling. However, large-scale spatial pattern and environmental drivers of plant Na allocation remain unclear.
Location: China and the world.
Time period: Field data were collected between 2013 and 2019. Literature data were collected between 1970 and 2024.
Major taxa studied: Vascular plants.
Methods: We compiled a global database of paired leaf Na (NaLeaf) and root Na (NaRoot) content, combining field observations from 2183 species across 72 Chinese ecosystems with global synthesized literature records.
Results: The spatial pattern of plant Na allocation between leaves and roots is primarily regulated by aridity. Generally, plants allocate more Na to roots in humid zone but more to leaves in arid zone. Furthermore, aridification leads to abrupt and nonlinear increases in the NaLeaf to NaRoot ratio (NaLeaf: Root) when aridity exceeds critical threshold (0.814 for the Chinese plant species and 0.774 for the Chinese plant community). Importantly, the threshold response is consistently observed from species to community levels and from China to global biomes.
Main conclusions: Our findings demonstrate the flexible allocation of plant Na in response to salinity and drought on a large scale. Projected aridification could amplify leaf Na allocation in threshold-exceeding regions, possibly enhancing activity of herbivores and decomposers and triggering cascading impacts on plant community structure and carbon cycling rate.