Microbial mechanisms underlying organic phosphorus mineralization and inorganic phosphorus solubilization in arid cotton fields under brackish water drip irrigation and phosphorus fertilization

作者：Ye Yang, Xiang Li, Tao Xu, Wei Min, Huijuan Guo · 发表于：Industrial Crops and Products · 年份：2025 · DOI：10.1016/j.indcrop.2025.121983 · 被引用次数：5 · 研究领域：Soil Carbon and Nitrogen Dynamics、Irrigation Practices and Water Management、Wastewater Treatment and Reuse

Phosphorus (P) fertilizer utilization is globally constrained by strong soil fixation, which reduces its effectiveness in improving crop yield and quality—a challenge particularly pronounced in arid regions like Xinjiang, China. In arid regions facing freshwater scarcity and soil salinization, integrating brackish water drip irrigation with P fertilization is a potential strategy to enhance cotton productivity. However, the microbial mechanisms particularly functional genes involved in organic phosphorus mineralization (OPM) and inorganic Phosphorus solubilization (IPS), remain poorly understood. This study, conducted in a fixed-site field experiment with consistent long-term treatments, assessed four treatments: fresh water without P (FW), fresh water with P (FWP), brackish water without P (BW), and brackish water with P (BWP), brackish water irrigation significantly reduced cotton growth with biomass, P uptake, and yield decreasing by 27.1 %, 36.1 %, and 17.2 %, respectively. It also altered soil properties, increasing water content, electrical conductivity, organic carbon, and bulk density, while decreasing pH and porosity. P fertilization mitigated these effects, boosting biomass, P uptake, and yield by 51.3 %, 57.9 %, and 10.4 %, respectively. Microbial analysis revealed that brackish water irrigation increased the relative abundance of Pseudomonadota, Bacteroidota, and the gene phnP , while decreasing phoD, gcd , and pqqC . P fertilization increased the abundance of Pse...