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<p>As an essential component of global change, atmospheric nitrogen deposition exerts profound impacts on ecosystems. Since ~ 1900 AD, the rapid increase in global nitrogen deposition has become an environmental concern. Lakes, as key components of terrestrial ecosystems, warrant further investigation regarding their responses to atmospheric nitrogen deposition. Here, we selected lakes from the Loess Plateau and the arid Northwest China to examine their potential responses to atmospheric nitrogen deposition since ~ 1900 AD. Our results show that: (1) The persistently negative δ¹⁵N values in lake sediments from the Loess Plateau since the 1900s may be linked to enhanced atmospheric nitrogen deposition; (2) The responses from lakes in the arid Northwest China to atmospheric nitrogen deposition may occur decades later than the lakes in Loess Plateau; (3) Compared to the effects of atmospheric nitrogen deposition, human activities (such as road construction, agricultural practices) near or within the lake catchments have caused stronger variability in sedimentary δ¹⁵N values. Our findings indicate that gradual increases in atmospheric nitrogen deposition may lead to significant responses in lakes and a shift in nutrient limitation.</p>

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Contrasting sedimentary nitrogen isotope responses to atmospheric nitrogen deposition in Northern China

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Kang’en Zhou,
  • Yingying Wei,
  • En’guo Sheng,
  • Bin Liu,
  • Keke Yu,
  • Jianghu Lan

摘要

As an essential component of global change, atmospheric nitrogen deposition exerts profound impacts on ecosystems. Since ~ 1900 AD, the rapid increase in global nitrogen deposition has become an environmental concern. Lakes, as key components of terrestrial ecosystems, warrant further investigation regarding their responses to atmospheric nitrogen deposition. Here, we selected lakes from the Loess Plateau and the arid Northwest China to examine their potential responses to atmospheric nitrogen deposition since ~ 1900 AD. Our results show that: (1) The persistently negative δ¹⁵N values in lake sediments from the Loess Plateau since the 1900s may be linked to enhanced atmospheric nitrogen deposition; (2) The responses from lakes in the arid Northwest China to atmospheric nitrogen deposition may occur decades later than the lakes in Loess Plateau; (3) Compared to the effects of atmospheric nitrogen deposition, human activities (such as road construction, agricultural practices) near or within the lake catchments have caused stronger variability in sedimentary δ¹⁵N values. Our findings indicate that gradual increases in atmospheric nitrogen deposition may lead to significant responses in lakes and a shift in nutrient limitation.