Plant-Derived Organic Acids Are Linked to Arbuscular Mycorrhizal Fungi and phoD-Harboring Bacteria Associated with Improved Soil Phosphorus Availability Across Plant Functional Groups in Karst Ecosystems

Phosphorus (P) limitation is prevalent in terrestrial ecosystems. Plants can improve soil P availability through the exudation of organic acids and symbiotic interactions with microorganisms. However, associations between different plant functional groups and phosphorus cycling in P limited karst ecosystems remain poorly understood. To investigate this, the exudation rates of oxalic, citric and acetic acids from fine roots, the contents of carbon, nitrogen, and P in leaves and fine roots, and th