Global Distribution and Influencing Factors of Plant‐Available Phosphorus in (Semi‐)Natural Soils

作者：Xianzhen Luo, Conghui Guo, Xianjin He, Julian Helfenstein, Hans Lambers, Qingqing Ren, Muhammed Mustapha Ibrahim, Zhimin Li, Huiying Lin, Zhaofeng Chang, Lingling Zhang, Dazhi Wen, Enqing Hou · 发表于：Global Biogeochemical Cycles · 年份：2025 · DOI：10.1029/2025gb008513 · 被引用次数：16 · 研究领域：Soil and Water Nutrient Dynamics、Soil Carbon and Nitrogen Dynamics、Peatlands and Wetlands Ecology

Abstract Phosphorus (P) is frequently a limiting nutrient for plant growth in natural ecosystems. Determining plant‐available P concentration in soil is essential for pinpointing areas where P availability might restrict plant growth and terrestrial carbon sequestration. However, the worldwide distribution and factors influencing plant‐available P in (semi‐)natural soils are not well understood. Here, we have developed a comprehensive global database that compiles plant‐available P measurements using five prevalent analytical methods: Olsen, Bray‐1, Mehlich III, Colwell, and AB‐DTPA. The data set encompasses 6,253 plant‐available P measurements in (semi‐)natural soils (under natural ecosystems and >10 years since anthropogenic activities) at 3,353 globally distributed sites. Leveraging this extensive database, we initially examined the global distribution and influencing factors of plant‐available soil P. Subsequently, we utilized a random forest model to delineate a detailed global map of plant‐available soil P patterns. Globally, plant‐available P varied over four orders of magnitude, from 0.01 to 99.2 mg kg −1 . The variation was best explained by parent material types and total soil P concentration. Random forest predicted plant‐available P increased significantly with latitude in both hemispheres, though with large longitudinal variations. Global stock of plant‐available P was estimated to be 0.73 Pg and 1.59 Pg at 0–30 cm and 30–100 cm soil depths. Our analysis provi...