Scholarlink

Purpose <p>Understanding microbial diversity and the life history strategies of microorganisms is essential for advancing our knowledge of soil organic carbon (SOC) turnover. Despite their significance, there’s a noticeable lack of research on how microbial <i>r-</i> and <i>K-</i>strategists in grazing exclusion (GE) settings can reliably indicate SOC.</p> Materials and methods <p>Using high-throughput sequencing and multiple statistical methods, we examined how GE influences SOC content, the composition of microbial <i>r/K-</i>strategists, and the overall microbial network in five typical sagebrush desert experimental plots in Xinjiang, northwest China.</p> Results <p>Our findings revealed a concerning trend: GE negatively impacts SOC, the Oligo/Copio ratio of bacteria and fungi, and the fungi EMC/Sapro ratio in sagebrush desert grassland. Moreover, GE significantly altered the topological characteristics of microbial networks. We observed a notable increase in the abundance of both <i>K-</i>strategy and <i>r-</i>strategy microbes among keystone taxa in the 0–5&#xa0;cm soil layer, contrasting sharply with the patterns found in the deeper 5–10&#xa0;cm layer. Random Forest, heatmap plot, and Structural equation model showed that the change <i>K</i>-strategy to an <i>r-</i>strategy has a significant effect on lnRR SOC.</p> Conclusion <p>Our research highlights a vital connection between microbial life strategies and SOC, providing new insights into how SOC accumulates following grazing exclusion.</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

Grazing exclusion affects soil organic carbon by shifting its life-history strategies in sagebrush desert grassland

  • 期刊论文

  • 发表日期：

    2026年2月12日

查看全文
  • Bingjie Yu,
  • Zongjiu Sun,
  • Yuxuan Cui,
  • Huixia Liu

摘要

Purpose

Understanding microbial diversity and the life history strategies of microorganisms is essential for advancing our knowledge of soil organic carbon (SOC) turnover. Despite their significance, there’s a noticeable lack of research on how microbial r- and K-strategists in grazing exclusion (GE) settings can reliably indicate SOC.

Materials and methods

Using high-throughput sequencing and multiple statistical methods, we examined how GE influences SOC content, the composition of microbial r/K-strategists, and the overall microbial network in five typical sagebrush desert experimental plots in Xinjiang, northwest China.

Results

Our findings revealed a concerning trend: GE negatively impacts SOC, the Oligo/Copio ratio of bacteria and fungi, and the fungi EMC/Sapro ratio in sagebrush desert grassland. Moreover, GE significantly altered the topological characteristics of microbial networks. We observed a notable increase in the abundance of both K-strategy and r-strategy microbes among keystone taxa in the 0–5 cm soil layer, contrasting sharply with the patterns found in the deeper 5–10 cm layer. Random Forest, heatmap plot, and Structural equation model showed that the change K-strategy to an r-strategy has a significant effect on lnRR SOC.

Conclusion

Our research highlights a vital connection between microbial life strategies and SOC, providing new insights into how SOC accumulates following grazing exclusion.