Scholarlink

<p>Excessive anthropogenic phosphorus inputs create nutrient surpluses along the terrestrial-aquatic continuum, triggering worldwide water quality challenges. River damming enhances phosphorus retention within river networks and redistributes it among reservoirs, rivers, and coastal oceans. However, the role of reservoirs as phosphorus sinks and their effect on phosphorus export to estuaries remain poorly quantified. We developed a coupled terrestrial-aquatic model to trace phosphorus fate in the highly dammed and fertilized Yangtze River Basin from 1980 to 2018. Our results show that cumulative dam-driven phosphorus retention reached <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({4.7}_{3.7}^{5.5}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mn>4.7</mn> </mrow> <mrow> <mn>3.7</mn> </mrow> <mrow> <mn>5.5</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation> teragrams of phosphorus (median and range), exceeding the cumulative rise in phosphorus loading (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({2.1}_{1.3}^{2.9}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mn>2.1</mn> </mrow> <mrow> <mn>1.3</mn> </mrow> <mrow> <mn>2.9</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation> teragrams of phosphorus), thereby reversing the anticipated rise in phosphorus export to the estuary. Notably, 40% of dam-induced retention occurred during 2011–2018, despite fertilizer use plateauing around 2010. This strengthened inland water phosphorus sink arises not only from increased damming but also from the continuous release of previously stored phosphorus in terrestrial ecosystems, highlighting the key role of legacy effects in controlling the phosphorus temporal dynamics.</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

Dam-driven phosphorus sinks reversed the anticipated increase in phosphorus export from the Yangtze River Basin

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月17日

查看全文
  • Zhimin Zhou,
  • Yan Sun,
  • Zhaoxue Yu,
  • Shushi Peng,
  • Pierre Regnier,
  • Maoyuan Feng,
  • Jinfeng Chang,
  • Zun Yin,
  • Haicheng Zhang,
  • Yang Gao,
  • Huiwang Gao

摘要

Excessive anthropogenic phosphorus inputs create nutrient surpluses along the terrestrial-aquatic continuum, triggering worldwide water quality challenges. River damming enhances phosphorus retention within river networks and redistributes it among reservoirs, rivers, and coastal oceans. However, the role of reservoirs as phosphorus sinks and their effect on phosphorus export to estuaries remain poorly quantified. We developed a coupled terrestrial-aquatic model to trace phosphorus fate in the highly dammed and fertilized Yangtze River Basin from 1980 to 2018. Our results show that cumulative dam-driven phosphorus retention reached \({4.7}_{3.7}^{5.5}\) 4.7 3.7 5.5 teragrams of phosphorus (median and range), exceeding the cumulative rise in phosphorus loading ( \({2.1}_{1.3}^{2.9}\) 2.1 1.3 2.9 teragrams of phosphorus), thereby reversing the anticipated rise in phosphorus export to the estuary. Notably, 40% of dam-induced retention occurred during 2011–2018, despite fertilizer use plateauing around 2010. This strengthened inland water phosphorus sink arises not only from increased damming but also from the continuous release of previously stored phosphorus in terrestrial ecosystems, highlighting the key role of legacy effects in controlling the phosphorus temporal dynamics.