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Purpose <p>While were many studies have focused on the individual effects of biochar and organic fertilizer on carbon sequestration, research on their combined application to enhance carbon sequestration in sediments remains limited. This study, therefore, primarily investigated the impacts of different ratios of biochar and organic fertilizer on the physicochemical properties, aggregate stability, aggregate size, and microbial community structure of sediments from the Xiangjiang River, as well as the influence of these factors on sedimentary carbon sequestration.</p> Methods <p>In this experiment, a control group (CK) was established, along with six experimental groups with different proportions of biochar and organic fertilizer added. Samples were collected from each group on days 7, 15, 30, 60, and 90 to assess the physicochemical properties of the sediment and the size distribution and stability of aggregates. Additionally, on day 90, the microbial community structure and the functional genes cbbM and cbbL of carbon-fixing microorganisms were analyzed.</p> Results <p>The results indicated that the introduction of these amendments significantly enhanced the stability of the aggregates and increased the content of larger aggregates. The mean weight diameter (MWD) and geometric mean diameter (GMD) of the sediment in each group were 1.01–1.19 and 1.14–1.62 times those of the control group, respectively. Additionally, the content of large macroaggregates increased by 0.24–4.23% compared to the control group. The content of sediment organic carbon (SOC) in the sediment increased by 3.47–6.81%. The amendments also had a significant impact on the sediment microbial community. The alpha diversity of the organisms decreased, and the abundance of the <i>Gemmatimonadetes</i>, which were involved in the decomposition of recalcitrant organic carbon, decreased by 3.93%.</p> Conclusions <p>The combined application of these amendments significantly altered the physicochemical properties of sediment, fostered the formation of larger macro-aggregate, and enhanced the stability of these aggregates, thereby promoting carbon sequestration in the sediment. Among the various amendments tested, the use of 100% biochar demonstrated the most pronounced effects.</p>

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Effects of biochar and organic fertilizer on microorganisms and aggregates and their carbon sequestration in sediment

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Hongjiao Li,
  • Jilai Gong,
  • Meng Qin,
  • Siqun Tang,
  • Biao Song

摘要

Purpose

While were many studies have focused on the individual effects of biochar and organic fertilizer on carbon sequestration, research on their combined application to enhance carbon sequestration in sediments remains limited. This study, therefore, primarily investigated the impacts of different ratios of biochar and organic fertilizer on the physicochemical properties, aggregate stability, aggregate size, and microbial community structure of sediments from the Xiangjiang River, as well as the influence of these factors on sedimentary carbon sequestration.

Methods

In this experiment, a control group (CK) was established, along with six experimental groups with different proportions of biochar and organic fertilizer added. Samples were collected from each group on days 7, 15, 30, 60, and 90 to assess the physicochemical properties of the sediment and the size distribution and stability of aggregates. Additionally, on day 90, the microbial community structure and the functional genes cbbM and cbbL of carbon-fixing microorganisms were analyzed.

Results

The results indicated that the introduction of these amendments significantly enhanced the stability of the aggregates and increased the content of larger aggregates. The mean weight diameter (MWD) and geometric mean diameter (GMD) of the sediment in each group were 1.01–1.19 and 1.14–1.62 times those of the control group, respectively. Additionally, the content of large macroaggregates increased by 0.24–4.23% compared to the control group. The content of sediment organic carbon (SOC) in the sediment increased by 3.47–6.81%. The amendments also had a significant impact on the sediment microbial community. The alpha diversity of the organisms decreased, and the abundance of the Gemmatimonadetes, which were involved in the decomposition of recalcitrant organic carbon, decreased by 3.93%.

Conclusions

The combined application of these amendments significantly altered the physicochemical properties of sediment, fostered the formation of larger macro-aggregate, and enhanced the stability of these aggregates, thereby promoting carbon sequestration in the sediment. Among the various amendments tested, the use of 100% biochar demonstrated the most pronounced effects.