Scholarlink

Background and aims <p>Microbial biomass carbon (MBC) has a significant contribution to soil carbon (C) pool. It has been suggested that plant input, soil C and nutrient condition, and microbial characteristic play crucial roles in MBC accumulation. However, the primary driver of MBC accumulation remains uncertain.</p> Methods <p>To fill this knowledge gap, we conducted a greenhouse <sup>13</sup>CO<sub>2</sub> labelling experiment by planting three pioneer species (<i>Pinus tabuliformis</i>, <i>Betula platyphylla</i>, <i>Populus purdomii</i>) in soils collected from three different depths, i.e., top-soil (0–10&#xa0;cm), mid-soil (10–30&#xa0;cm), and deep-soil (30–100&#xa0;cm).</p> Results <p>We found that MB<sup>13</sup>C positively correlated with plant aboveground and belowground <sup>13</sup>C. The effects of plant <sup>13</sup>C on MBC accumulation were mainly mediated by fungal diversity and composition. Specifically, mycorrhizal fungi (e.g., <i>Peziza</i>) and toxigenic genera (e.g., <i>Fusarium</i> and <i>Penicillium</i>) were identified as crucial fungal taxa. Notably, plant <sup>13</sup>C allocation (aboveground <sup>13</sup>C, belowground <sup>13</sup>C, proportion of aboveground <sup>13</sup>C, and proportion of belowground <sup>13</sup>C) explained a larger proportion (17.50%) of MB<sup>13</sup>C variation among treatments than did soil available phosphorus contents and microbial community structure (fungal diversity and composition) (1.98%).</p> Conclusion <p>Our study suggests that plant inputs are major determinants of soil C storage, as plant C allocation was identified as the primary driver of MBC accumulation. Given the different roles of fungi and bacteria, separating fungal and bacterial biomass C can refine our understanding of MBC accumulation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Plant carbon allocation, soil carbon and nutrient condition, and microbial community jointly regulate microbial biomass carbon accumulation

  • 期刊论文

  • 发表日期：

    2025年2月7日

查看全文
  • Huijuan Xia,
  • Youchao Chen,
  • Zhi Yu,
  • Xiaomin Zeng,
  • Shuwei Yin,
  • Xinshuai Li,
  • Kerong Zhang

摘要

Background and aims

Microbial biomass carbon (MBC) has a significant contribution to soil carbon (C) pool. It has been suggested that plant input, soil C and nutrient condition, and microbial characteristic play crucial roles in MBC accumulation. However, the primary driver of MBC accumulation remains uncertain.

Methods

To fill this knowledge gap, we conducted a greenhouse 13CO2 labelling experiment by planting three pioneer species (Pinus tabuliformis, Betula platyphylla, Populus purdomii) in soils collected from three different depths, i.e., top-soil (0–10 cm), mid-soil (10–30 cm), and deep-soil (30–100 cm).

Results

We found that MB13C positively correlated with plant aboveground and belowground 13C. The effects of plant 13C on MBC accumulation were mainly mediated by fungal diversity and composition. Specifically, mycorrhizal fungi (e.g., Peziza) and toxigenic genera (e.g., Fusarium and Penicillium) were identified as crucial fungal taxa. Notably, plant 13C allocation (aboveground 13C, belowground 13C, proportion of aboveground 13C, and proportion of belowground 13C) explained a larger proportion (17.50%) of MB13C variation among treatments than did soil available phosphorus contents and microbial community structure (fungal diversity and composition) (1.98%).

Conclusion

Our study suggests that plant inputs are major determinants of soil C storage, as plant C allocation was identified as the primary driver of MBC accumulation. Given the different roles of fungi and bacteria, separating fungal and bacterial biomass C can refine our understanding of MBC accumulation.