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<p>Since the pre-industrial era, human activities have drastically increased reactive nitrogen (Nr) deposition in lakes, altering nitrogen (N) cycles. To trace its continental-scale footprints, we synthesized dated sediment δ<sup>15</sup>N records from 51 remote lakes across North America, Europe, and East Asia. Results reveal that the accelerated declines in δ<sup>15</sup>N (indicating increased Nr deposition) occurred earlier in North American and European lakes (~1950 CE), coinciding with the Great Acceleration, while similar changes in East Asian lakes appeared around 1985 CE, paralleling China’s rapid socioeconomic development. δ<sup>15</sup>N in North American lakes reversed around 2005 CE (~10%), and earlier in European lakes (~1995 CE) with more pronounced (~40%) increases. Meanwhile, East Asian lakes showed no reversal (only a slowdown in the δ<sup>15</sup>N decline). These regional differences match the timing and implementation of N emission policies, underscoring the need for region-specific and multi-N species (e.g., NH<sub>x</sub> and NO<sub>y</sub>) mitigation strategies to protect lake ecosystems.</p>

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Nitrogen isotopes in remote lake sediments reveal effectiveness of nitrogen mitigation

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月23日

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  • Anze Chen,
  • Xin Zhou,
  • John P. Smol,
  • Shiwei Jiang,
  • Hongfei Zhao,
  • Qun Zheng,
  • Xiangzhong Li,
  • Yong Luo,
  • Xiaoyan Liu,
  • Zhuoya Zhang,
  • Zhengtang Guo

摘要

Since the pre-industrial era, human activities have drastically increased reactive nitrogen (Nr) deposition in lakes, altering nitrogen (N) cycles. To trace its continental-scale footprints, we synthesized dated sediment δ15N records from 51 remote lakes across North America, Europe, and East Asia. Results reveal that the accelerated declines in δ15N (indicating increased Nr deposition) occurred earlier in North American and European lakes (~1950 CE), coinciding with the Great Acceleration, while similar changes in East Asian lakes appeared around 1985 CE, paralleling China’s rapid socioeconomic development. δ15N in North American lakes reversed around 2005 CE (~10%), and earlier in European lakes (~1995 CE) with more pronounced (~40%) increases. Meanwhile, East Asian lakes showed no reversal (only a slowdown in the δ15N decline). These regional differences match the timing and implementation of N emission policies, underscoring the need for region-specific and multi-N species (e.g., NHx and NOy) mitigation strategies to protect lake ecosystems.