Alleviated environmental constraints and restructured fungal microbiome facilitate aggregate formation and stabilization in coastal mudflat saline soil amended by sewage sludge

作者：Yunlong Li, Chao Shen, Yimin Wang, Xu Lu, Yilin Zhao, Siqiang Yi, Wengang Zuo, Rongjiang Yao, Xing Zhang, Chuanhui Gu, Yuhua Shan, Yanchao Bai · 发表于：Land Degradation and Development · 年份：2023 · DOI：10.1002/ldr.4668 · 被引用次数：13 · 研究领域：Soil Carbon and Nitrogen Dynamics、Mycorrhizal Fungi and Plant Interactions、Microbial Community Ecology and Physiology

Abstract Soil aggregates are important drivers of soil productivity. However, the relative importance of soil abiotic and biotic agents in driving aggregate formation and stabilization remain largely unexplored, especially in coastal mudflat saline soils. We amended saline soil with sewage sludge at rates of 0, 30, 75, and 150 t ha −1 to investigate the effects of sewage sludge on the particle size distribution and stability of soil aggregate and the underlying mechanisms induced by soil environmental factors and fungal community. Results revealed that the sewage sludge amendment significantly ( p < 0.05) increased the proportion of macroaggregates with sizes larger than 0.25 mm ( R 0.25 ) and enhanced aggregate stability. Moreover, alleviation of saline‐alkali stress and nutrient (C, N, and P) deficiency conditions were significantly ( p < 0.05) observed in sewage sludge‐amended soils. Additionally, restructured fungal communities in amended soils harbored significantly ( p < 0.05) distinguishable structures and core and unique microbiomes. Particularly, fungal species belonging to Moterella significantly ( p < 0.05) enriched in sludge reclaimed soils. Results derived from the random forest (RF) model accompanied by linear regression analysis revealed that soil pH, soil organic carbon, and fungal structural diversity were significantly ( p < 0.05) related to aggregate composition ( R 0.25 ) and stability (geometric average diameter, GMD). Furthermore, fungal c...