Organic substitution regulated the soil microbial communities by modifying nutrient limitations in saline-alkaline soils

作者：Yue Han, Zhanli Ma, Rui Chen, Yue Wen, Yonghui Liang, Jinzhu Zhang, Wenhao Li, Zhenhua Wang · 发表于：Agricultural Water Management · 年份：2025 · DOI：10.1016/j.agwat.2025.109586 · 被引用次数：11 · 研究领域：Soil Carbon and Nitrogen Dynamics、Agriculture, Soil, Plant Science、Clay minerals and soil interactions

Organic amendment strategies significantly influence soil microbial community structure and functional activity, particularly in salt-affected agroecosystems. However, the mechanistic pathways by which organic substitution strategies regulate microbial resource utilization remain largely unexplored. This investigation examined the effects of organic fertilizer substitution on soil improvement and microbial community regulation in saline-alkaline soils, with a specific focus on understanding the mechanistic linkages between nutrient regulation and microbial community composition. To address this, a three-year field experiment was conducted in an arid saline ecosystem of western China. Under a constant total N input of 320 kg N ha −1 , four treatments with different organic N substitution rates of urea-N were designed: CK (100 % urea-N), OF40 (organic fertilizer substituting 40 % of the urea N), OF80 (organic fertilizer substituting 80 % of the urea N), and OF100 (organic fertilizer substituting 100 % of the urea N). Following three years of differential fertilization management, the results showed that OF40, OF80 and OF100 treatments significantly enhanced soil C and N contents in the topsoil (0 20 cm). Compared to CK, Organic substitution treatments (OF40-OF100) enhanced soil total carbon (TC), soil organic carbon (SOC), soil total nitrogen (TN), and soil NH 4 + -N concentrations by 2.61 80.19 %. Conversely, soil available phosphorus (AP) and NO 3 − -N concentrations decrease...