Scholarlink

Aim <p>Soil microorganisms rely on coupled fluxes of carbon (C) and energy to fuel their maintenance, switch from dormancy to activity and grow in microhabitats characterized by dynamic environmental conditions. Although C and energy fluxes in microbial metabolism are closely linked, there is a lack of cases investigating how they jointly affect microbial growth under land use change.</p> Methods <p>We assessed C use efficiency (CUE) using <sup>18</sup>O-labelled water on 0–20&#xa0;cm soils collected from hundred years of continuous land use, combined with substrate-induced growth respiration and microcalorimetry to monitor land-use effects on microbial growth and heat release.</p> Results <p>The shorter lag-phase and higher fractions of growing microorganisms, aligned with microbial proliferation induced faster microbial turnover and 11–27% higher CUE in grassland. Respiration and heat release curves exhibited a coupled pattern. However, the heat release peak occurred 3–5&#xa0;h earlier irrespective of land uses. Specifically, grassland soil had greater heat release by 12–39% than cropland and bare fallow soils. After the heat release peak, the heat rate decreased in grassland, while bare fallow soil exhibited a more gradual decrease. This was attributed to the continual decrease in C availability (i.e., dissolved organic C) and the dormancy of microorganisms (i.e., lower microbial biomass) in bare fallow limited the utilization of substrate by decomposers and lowered microbial growth rate, and prolonged heat release.</p> Conclusion <p>We conclude that sustaining fungal-mediated processes and substrate quality is vital for enhancing soil C sequestration under land-use intensification.</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

Microbial carbon and energy use efficiency after a centennial history of land use

  • 期刊论文

  • 发表日期：

    2026年4月13日

查看全文
  • Xinhu Guo,
  • Feifei Yao,
  • Kevin Z. Mganga,
  • Wentao Zhang,
  • Yingxin Lu,
  • Haishui Yang,
  • Feng-Min Li,
  • Lingling Shi,
  • Jie Zhou,
  • Kazem Zamanian

摘要

Aim

Soil microorganisms rely on coupled fluxes of carbon (C) and energy to fuel their maintenance, switch from dormancy to activity and grow in microhabitats characterized by dynamic environmental conditions. Although C and energy fluxes in microbial metabolism are closely linked, there is a lack of cases investigating how they jointly affect microbial growth under land use change.

Methods

We assessed C use efficiency (CUE) using 18O-labelled water on 0–20 cm soils collected from hundred years of continuous land use, combined with substrate-induced growth respiration and microcalorimetry to monitor land-use effects on microbial growth and heat release.

Results

The shorter lag-phase and higher fractions of growing microorganisms, aligned with microbial proliferation induced faster microbial turnover and 11–27% higher CUE in grassland. Respiration and heat release curves exhibited a coupled pattern. However, the heat release peak occurred 3–5 h earlier irrespective of land uses. Specifically, grassland soil had greater heat release by 12–39% than cropland and bare fallow soils. After the heat release peak, the heat rate decreased in grassland, while bare fallow soil exhibited a more gradual decrease. This was attributed to the continual decrease in C availability (i.e., dissolved organic C) and the dormancy of microorganisms (i.e., lower microbial biomass) in bare fallow limited the utilization of substrate by decomposers and lowered microbial growth rate, and prolonged heat release.

Conclusion

We conclude that sustaining fungal-mediated processes and substrate quality is vital for enhancing soil C sequestration under land-use intensification.