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<p>Revealing the mechanisms by which soil microbes mediate nutrient cycling at the aggregate scale holds promise for improving soil structure and increasing the accumulation of soil nutrients. Soil samples were collected at depths of 0–20&#xa0;cm and 20–40&#xa0;cm from various Chinese fir plantations, which included the pure Chinese fir (I), Chinese fir × <i>Mytilaria laosensis</i> (II), and Chinese fir × <i>Michelia macclurei</i> (III). Soil aggregates were categorized into four fractions and their stability was assessed using mean weight diameter (MWD) and geometric mean diameter (GMD). Soil microbial biomass C (MBC), N (MBN), P (MBP), and their ratios (C:N<sub>M</sub>, C:P<sub>M</sub>, and N:P<sub>M</sub>) were analyzed for each aggregate fractions. Stand type III had higher MWD and GMD than the other types. Soil MBC, MBN, and MBP concentrations followed the trend: stand type III &gt; II &gt; I, while no significant differences (<i>P</i> &gt; <i>0.05</i>) were found in C:N<sub>M</sub>, C:P<sub>M</sub>, and N:P<sub>M</sub> ratios among different stand types. Redundancy analysis identified &lt; 0.25&#xa0;mm aggregates, &gt; 2&#xa0;mm aggregates, and MWD as the primary factors influencing microbial stoichiometric characteristics in the 0–20&#xa0;cm layer, while in the 20–40&#xa0;cm layer, &lt; 0.25&#xa0;mm aggregates, MWD, and GMD were the key factors. Partial least square-structural equation model revealed that stand types had a direct impact on microbial stoichiometry and an indirect impact through soil aggregates, with the direct influence being predominant. Stand type III was the most effective in enhancing soil aggregate stability, fostering optimal conditions for soil microorganisms, and promoting a balanced microbial stoichiometry.</p>

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Mixed with Broadleaf Tree Species Changes Soil Microbial Stoichiometric Characteristics in Chinese Fir Plantations: Insights at the Aggregate Scale

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Xuegan Lu,
  • Yili Guo,
  • Xianyu Yao,
  • Shaoming Ye,
  • Shengqiang Wang

摘要

Revealing the mechanisms by which soil microbes mediate nutrient cycling at the aggregate scale holds promise for improving soil structure and increasing the accumulation of soil nutrients. Soil samples were collected at depths of 0–20 cm and 20–40 cm from various Chinese fir plantations, which included the pure Chinese fir (I), Chinese fir × Mytilaria laosensis (II), and Chinese fir × Michelia macclurei (III). Soil aggregates were categorized into four fractions and their stability was assessed using mean weight diameter (MWD) and geometric mean diameter (GMD). Soil microbial biomass C (MBC), N (MBN), P (MBP), and their ratios (C:NM, C:PM, and N:PM) were analyzed for each aggregate fractions. Stand type III had higher MWD and GMD than the other types. Soil MBC, MBN, and MBP concentrations followed the trend: stand type III > II > I, while no significant differences (P > 0.05) were found in C:NM, C:PM, and N:PM ratios among different stand types. Redundancy analysis identified < 0.25 mm aggregates, > 2 mm aggregates, and MWD as the primary factors influencing microbial stoichiometric characteristics in the 0–20 cm layer, while in the 20–40 cm layer, < 0.25 mm aggregates, MWD, and GMD were the key factors. Partial least square-structural equation model revealed that stand types had a direct impact on microbial stoichiometry and an indirect impact through soil aggregates, with the direct influence being predominant. Stand type III was the most effective in enhancing soil aggregate stability, fostering optimal conditions for soil microorganisms, and promoting a balanced microbial stoichiometry.