Scholarlink

Aims <p>Understanding the long-term effects of elevated atmospheric CO<sub>2</sub> (eCO<sub>2</sub>) and warming on soil organic carbon (SOC), along with the microbial mechanisms involved, is important for predicting SOC stability in the context of future climate change.</p> Methods <p>Open-top chambers were used to simulate an increase in the atmospheric CO<sub>2</sub> concentration to 700&#xa0;ppm (eCO<sub>2</sub>) and an air temperature of 2&#xa0;°C above the ambient temperature (warming) in a six-year experiment to examine the effects of eCO<sub>2</sub> and warming on the SOC fractions and bacterial community diversity. Maize plants were grown in four major farming soils, namely, Phaeozem, Kastanozem, Fluvisol and Acrisol.</p> Results <p>Six years of eCO<sub>2</sub> did not increase the SOC concentration in any soil but altered the distribution of the SOC fractions. In comparison, eCO<sub>2</sub> and warming decreased fine particulate organic C (fPOC) but increased the mineral-associated organic C (MOC) concentrations in Phaeozem and Kastanozem. In comparison, eCO<sub>2</sub> and warming significantly decreased the MOC in Fluvisol and tended to increase it in Acrisol. For Phaeozem, Kastanozem and Acrisol, fPOC was negatively correlated with MOC (<i>p</i> &lt; 0.05). Warming altered the bacterial community composition in Kastanozem, Acrisol and Fluvisol. The increased abundance of <i>Aquicella</i> in Fluvisol under eCO<sub>2</sub> and warming was associated with accelerated MOC decomposition.</p> Conclusions <p>Long-term eCO<sub>2</sub> and warming might not alter the SOC stock but affect the bacterial community, accelerating C turnover among different SOC pools. The decrease in the MOC fraction of Fluvisol raises concerns about the SOC sustainability of this soil under climate change.</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 mediation of soil organic carbon fractions and its feedback to long-term climate change

  • 期刊论文

  • 发表日期：

    2025年1月2日

查看全文
  • Xinqi SiMa,
  • Rui Fang,
  • Zhenhua Yu,
  • Yansheng Li,
  • Xiaojing Hu,
  • Haidong Gu,
  • Caixian Tang,
  • Judong Liu,
  • Junjie Liu,
  • Xiaobing Liu,
  • Guanghua Wang,
  • Ashley Franks,
  • Kuide Yin,
  • Jian Jin

摘要

Aims

Understanding the long-term effects of elevated atmospheric CO2 (eCO2) and warming on soil organic carbon (SOC), along with the microbial mechanisms involved, is important for predicting SOC stability in the context of future climate change.

Methods

Open-top chambers were used to simulate an increase in the atmospheric CO2 concentration to 700 ppm (eCO2) and an air temperature of 2 °C above the ambient temperature (warming) in a six-year experiment to examine the effects of eCO2 and warming on the SOC fractions and bacterial community diversity. Maize plants were grown in four major farming soils, namely, Phaeozem, Kastanozem, Fluvisol and Acrisol.

Results

Six years of eCO2 did not increase the SOC concentration in any soil but altered the distribution of the SOC fractions. In comparison, eCO2 and warming decreased fine particulate organic C (fPOC) but increased the mineral-associated organic C (MOC) concentrations in Phaeozem and Kastanozem. In comparison, eCO2 and warming significantly decreased the MOC in Fluvisol and tended to increase it in Acrisol. For Phaeozem, Kastanozem and Acrisol, fPOC was negatively correlated with MOC (p < 0.05). Warming altered the bacterial community composition in Kastanozem, Acrisol and Fluvisol. The increased abundance of Aquicella in Fluvisol under eCO2 and warming was associated with accelerated MOC decomposition.

Conclusions

Long-term eCO2 and warming might not alter the SOC stock but affect the bacterial community, accelerating C turnover among different SOC pools. The decrease in the MOC fraction of Fluvisol raises concerns about the SOC sustainability of this soil under climate change.