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Aims <p>There are one billion hectares of saline soil worldwide, which is a serious problem. Meanwhile, a gap remains in understanding the combined influence of soil salinity and aggregate size on microbial communities. The current study provided insight into the joint effects of soil salinity and aggregate size on the microbial function of saline soil, specifically in terms of carbon and nitrogen cycling.</p> Methods <p>The study was conducted in a rice field of Tiaozini Wetland (32°76.0'N, 120°96.3'E), located in Yancheng, Jiangsu Province, China. In this experiment, the low salinity and high salinity soils were divided into four size aggregates, respectively. The soil’s physicochemical properties, microbial biomass carbon (MBC), and 16S sequencing were determined.</p> Results <p>We found that the MBC decreased as salinity increased, except in the 53–250&#xa0;μm aggregates. High salinity inhibited the predicted abundance of functional genes involved in microbial carbohydrate metabolism, amino acid metabolism, chemolithotrophy, and nitrogen metabolism. Conversely, it significantly improved the predicted abundance of functional genes involved in nitrite ammonification.</p> Conclusions <p>The 250–2000&#xa0;μm soil aggregates under low salinity conditions had the most significant positive impact on soil carbon and nitrogen cycling. The impact of salinity and aggregate size on predicted functional genes related to carbon cycling was greater than that on nitrogen cycling. Furthermore, under the combined effect of salinity and aggregate size, cyanobacteria emerged as the primary microbial community affecting the predicted functional genes involved in carbon and nitrogen cycling.</p>

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Effect of salinity and soil aggregate size on microbial community involved in carbon and nitrogen cycling

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Jiuwei Song,
  • Yuhan Cai,
  • Yunxiu Zhao,
  • Xingmei Liu

摘要

Aims

There are one billion hectares of saline soil worldwide, which is a serious problem. Meanwhile, a gap remains in understanding the combined influence of soil salinity and aggregate size on microbial communities. The current study provided insight into the joint effects of soil salinity and aggregate size on the microbial function of saline soil, specifically in terms of carbon and nitrogen cycling.

Methods

The study was conducted in a rice field of Tiaozini Wetland (32°76.0'N, 120°96.3'E), located in Yancheng, Jiangsu Province, China. In this experiment, the low salinity and high salinity soils were divided into four size aggregates, respectively. The soil’s physicochemical properties, microbial biomass carbon (MBC), and 16S sequencing were determined.

Results

We found that the MBC decreased as salinity increased, except in the 53–250 μm aggregates. High salinity inhibited the predicted abundance of functional genes involved in microbial carbohydrate metabolism, amino acid metabolism, chemolithotrophy, and nitrogen metabolism. Conversely, it significantly improved the predicted abundance of functional genes involved in nitrite ammonification.

Conclusions

The 250–2000 μm soil aggregates under low salinity conditions had the most significant positive impact on soil carbon and nitrogen cycling. The impact of salinity and aggregate size on predicted functional genes related to carbon cycling was greater than that on nitrogen cycling. Furthermore, under the combined effect of salinity and aggregate size, cyanobacteria emerged as the primary microbial community affecting the predicted functional genes involved in carbon and nitrogen cycling.