[Microbial Community Structure and Functional Genes of Phosphorus Cycling in Cotton Field Soil Under Long-term Saline Drip Irrigation].

• DOI: 10.13227/j.hjkx.202402036
• Publication Date: 2025-02-08
• Authors: Ye Yang; Xiao-Wen Guo; Min Yang; Wei Min; Huijuan Guo
• Keywords: Cycling; Soil structure

Freshwater resources are scarce in arid regions, and the rational use of brackish water can alleviate local freshwater shortages, but long-term drip irrigation increases risk soil salinization, which turn affects nutrient transformation microbial diversity. Soil phosphorus availability is critical for crop growth, yet it unclear how will affect transformation. Therefore, to investigate effects on phosphorus-transforming microorganisms their functional genes cotton fields, experiment was set up with two salinities, （0.35 dS·m-1, FW） （8.04 SW）. The results showed that significantly decreased dry matter weight, uptake, yield, pH, Ca2-P Ca10-P contents increased content content； electrical conductivity； quick phosphorus； Ca8-P, Al-P, Fe-P, O-P contents. dominant species each treatment at phylum level were Ascomycetes, Actinobacteria, Acidobacteria, Bacillus, Greenscapes； level, α-Ascomycetes, β-Ascomycetes, Oleococcus thermophilus, γ-Ascomycetes. including Proteobacteria, Gemmatimonadetes, Chloroflexi. Select class included Alphaproteobacteria, Actinomycetia, Betaproteobacteria, Thermoleophilia, Gammaproteobacteria. Long-term saline reduced relative abundance Nitrospirae Bacteroidetes expression levels organic mineralization gene phnA, transport pit, polyphosphate synthesis ppaC. Moreover, degradation HDDC3； phnG, phoA, phnH, phnL, phnM, phnN, phnP, phnW； phnK, phnE, phnC, phnD； regulatory phoB. Correlation analysis phosphorus-cycling closely related physicochemical properties inorganic content. changes composition by affecting physical chemical content, drives phosphorus-cycling-related regulate adapt salt stress.