Scholarlink

Background <p>The increasing risk of soil organic carbon (SOC) loss in farming soils under elevated atmospheric CO<sub>2</sub> (eCO<sub>2</sub>) environments calls for mechanistic studies on how the increased plant-C input in response to eCO<sub>2</sub> alters microbial phylogenetic diversity and metabolic activity, and how that relates to SOC decomposition via eCO<sub>2</sub>-induced priming.</p> Methods <p>A natural <sup>13</sup>C-enriched soil was used to quantify plant- and soil-originated C from belowground respiration. Canola, white lupin and wheat were grown under ambient CO<sub>2</sub> (400&#xa0;ppm) and eCO<sub>2</sub> (800&#xa0;ppm) until the flowering stage.</p> Results <p>Elevated&#xa0;CO<sub>2</sub> increased rhizosphere priming by 2.0- and 2.3-fold (<i>p</i> &lt; 0.05) in lupin-grown soil at 48 and 63&#xa0;days, respectively, but had no significant effect in canola- or wheat-grown soils. The greater ratio of dissolved organic C to mineral N (101 compared to 22 and 36 for canola and wheat, respectively) might contribute to the enhanced priming effect in the lupin rhizosphere. Phylogenetic differential abundance analysis indicated that <i>Streptomyces</i>, <i>Geodermatophilus</i> and <i>Mycobacterium,</i> affiliated to Actinobacteriota, in the lupin rhizosphere were enriched under eCO<sub>2</sub>, and hence may play an important role in SOC decomposition. In the fungal community, <i>Udeniozyma</i>, a saprotrophic yeast genus, in the lupin rhizosphere was more abundant under eCO<sub>2</sub> than ambient CO<sub>2</sub>, and accounted for 2.3% of the fungal community, further contributing to the priming effect.</p> Conclusion <p>The increase of dissolved organic C relative to mineral N may drive Actinobacteriota genera to facilitate SOC mineralization in the rhizosphere of lupin grown in the eCO<sub>2</sub> environment.</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

Clarifying the role of microbial communities in carbon loss from rhizosphere priming of contrasting crop species under elevated atmospheric CO2

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月26日

查看全文
  • Jian Jin,
  • Christian Krohn,
  • Rachel Davis,
  • Ashley E. Franks,
  • Xiaojuan Wang,
  • Jennifer L. Wood,
  • Caixian Tang

摘要

Background

The increasing risk of soil organic carbon (SOC) loss in farming soils under elevated atmospheric CO2 (eCO2) environments calls for mechanistic studies on how the increased plant-C input in response to eCO2 alters microbial phylogenetic diversity and metabolic activity, and how that relates to SOC decomposition via eCO2-induced priming.

Methods

A natural 13C-enriched soil was used to quantify plant- and soil-originated C from belowground respiration. Canola, white lupin and wheat were grown under ambient CO2 (400 ppm) and eCO2 (800 ppm) until the flowering stage.

Results

Elevated CO2 increased rhizosphere priming by 2.0- and 2.3-fold (p < 0.05) in lupin-grown soil at 48 and 63 days, respectively, but had no significant effect in canola- or wheat-grown soils. The greater ratio of dissolved organic C to mineral N (101 compared to 22 and 36 for canola and wheat, respectively) might contribute to the enhanced priming effect in the lupin rhizosphere. Phylogenetic differential abundance analysis indicated that Streptomyces, Geodermatophilus and Mycobacterium, affiliated to Actinobacteriota, in the lupin rhizosphere were enriched under eCO2, and hence may play an important role in SOC decomposition. In the fungal community, Udeniozyma, a saprotrophic yeast genus, in the lupin rhizosphere was more abundant under eCO2 than ambient CO2, and accounted for 2.3% of the fungal community, further contributing to the priming effect.

Conclusion

The increase of dissolved organic C relative to mineral N may drive Actinobacteriota genera to facilitate SOC mineralization in the rhizosphere of lupin grown in the eCO2 environment.