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<p>Against the backdrop of continuously increasing global nitrogen (N) deposition, the changes in photosynthetic carbon (C) allocation patterns of desert plants and their underlying mechanisms affecting soil C sequestration remain poorly understood. This study selected two representative species from desert ecosystems: the non-vascular moss <i>Syntrichia caninervis</i> and the vascular ephemeral plant <i>Erodium oxyrhinchum</i> as research subjects. Three N deposition levels were implemented: 0 (N0), 10.0 (N10), and 30.0&#xa0;kg&#xa0;N&#xa0;ha<sup>−1</sup>&#xa0;a<sup>−1</sup> (N30), combined with <sup>13</sup>C stable isotope labeling technique, to systematically investigate the effects of N deposition on plant photosynthetic C allocation and soil C sequestration. The experiment demonstrated that: (1) Aboveground <sup>13</sup>C content in both species decreased significantly with increasing N input (<i>P</i> &lt; 0.05); (2) N deposition significantly promoted photosynthetic C transfer to soil, with soil <sup>13</sup>C allocation increasing from 0.8% (N0) to 4.0% (N30) for <i>S. caninervis</i>, and from 5.0 to 12.2% for <i>E. oxyrhinchum</i> (<i>P</i> &lt; 0.01). N deposition alters photosynthetic C allocation strategies in desert plants, significantly enhancing belowground C transfer and strengthening soil C sink function. This study provides crucial experimental evidence for evaluating arid region C cycle dynamics under global N deposition scenarios.</p>

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Nitrogen input drives carbon flow in desert ecosystems: mechanisms of photosynthetic carbon allocation response to nitrogen deposition

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Jungang Yang,
  • Xing Guo,
  • Lingwei Zhang,
  • Wei Hang,
  • Fan Du,
  • Yongxing Lu,
  • Boyi Song,
  • Hao Guo,
  • Huiliang Liu,
  • Benfeng Yin,
  • Xiaobing Zhou,
  • Yuanming Zhang

摘要

Against the backdrop of continuously increasing global nitrogen (N) deposition, the changes in photosynthetic carbon (C) allocation patterns of desert plants and their underlying mechanisms affecting soil C sequestration remain poorly understood. This study selected two representative species from desert ecosystems: the non-vascular moss Syntrichia caninervis and the vascular ephemeral plant Erodium oxyrhinchum as research subjects. Three N deposition levels were implemented: 0 (N0), 10.0 (N10), and 30.0 kg N ha−1 a−1 (N30), combined with 13C stable isotope labeling technique, to systematically investigate the effects of N deposition on plant photosynthetic C allocation and soil C sequestration. The experiment demonstrated that: (1) Aboveground 13C content in both species decreased significantly with increasing N input (P < 0.05); (2) N deposition significantly promoted photosynthetic C transfer to soil, with soil 13C allocation increasing from 0.8% (N0) to 4.0% (N30) for S. caninervis, and from 5.0 to 12.2% for E. oxyrhinchum (P < 0.01). N deposition alters photosynthetic C allocation strategies in desert plants, significantly enhancing belowground C transfer and strengthening soil C sink function. This study provides crucial experimental evidence for evaluating arid region C cycle dynamics under global N deposition scenarios.