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<p>Understanding the relationship between microorganisms and phosphorus (P) fractions under varying precipitation is crucial for developing microbial nutrition strategies in response to environmental changes in arid regions. Here we assessed microorganisms, enzyme kinetics, P fraction dynamics, and P desorption kinetics in a two-year field experiment with various precipitations: drought intensification, natural precipitation, and increased precipitation. The findings showed increased precipitation enhanced bacterial diversity while reducing fungal diversity, observed species, and desorption energy site. Drought intensification promoted stress-tolerant species abundance but decreased moisture-sensitive species, inorganic pyrophosphatase activity, and maximum reaction rate. For P fraction changes, bacteria+fungi jointly contributed 49.9%, enzymes 28.8%, and P desorption 21.4%. A key pathway for microorganisms mediating P fractions in response to precipitation involved enhancing enzyme kinetics, promoting P fraction concentration, facilitating P desorption, and increasing desorbed P, which was then utilized by microorganisms (primarily bacteria). This study provides insight into microbial nutrition strategies in changing ecosystems.</p>

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Microorganisms mediate multiple phosphorus fractions to respond to the precipitation patterns in arid deserts

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月18日

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  • Chengyi Li,
  • Mingzhu He,
  • Chunming Xin,
  • Huijun Qin,
  • Zhaohui Zhang,
  • Jiachen Shen

摘要

Understanding the relationship between microorganisms and phosphorus (P) fractions under varying precipitation is crucial for developing microbial nutrition strategies in response to environmental changes in arid regions. Here we assessed microorganisms, enzyme kinetics, P fraction dynamics, and P desorption kinetics in a two-year field experiment with various precipitations: drought intensification, natural precipitation, and increased precipitation. The findings showed increased precipitation enhanced bacterial diversity while reducing fungal diversity, observed species, and desorption energy site. Drought intensification promoted stress-tolerant species abundance but decreased moisture-sensitive species, inorganic pyrophosphatase activity, and maximum reaction rate. For P fraction changes, bacteria+fungi jointly contributed 49.9%, enzymes 28.8%, and P desorption 21.4%. A key pathway for microorganisms mediating P fractions in response to precipitation involved enhancing enzyme kinetics, promoting P fraction concentration, facilitating P desorption, and increasing desorbed P, which was then utilized by microorganisms (primarily bacteria). This study provides insight into microbial nutrition strategies in changing ecosystems.