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<p>Forest ecosystem responses to nitrogen (N) deposition depend on N fate, yet most simulated N deposition experiments focus on understory addition, overlooking canopy N processes. Here we compared canopy (CAN) and understory (UAN) N addition in a secondary forest using a <sup>15</sup>N tracer approach, adding <sup>15</sup>N as <sup>15</sup>NO<sub>3</sub><sup>-</sup> or <sup>15</sup>NH<sub>4</sub><sup>+</sup>. Total <sup>15</sup>N recovery was higher under UAN than CAN initially, but recoveries converged by day 365. CAN increased long-term N retention in woody biomass, with stems becoming the dominant sink, accounting for up to 34.9% of <sup>15</sup>N recovered after one year. UAN promoted short-term N retention in understory layer and long-term N retention in soil. <sup>15</sup>N recovery increased with soil depth under CAN but decreased under UAN from 120 to 365 days. Trees absorbed more <sup>15</sup>NO<sub>3</sub><sup>-</sup> than <sup>15</sup>NH<sub>4</sub><sup>+</sup>, whereas soil retained the two forms similarly. These findings indicate that N manipulation methods affect N retention magnitude and spatial distribution.</p>

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Above canopy and understory nitrogen additions lead to divergent spatio-temporal nitrogen retention patterns in a temperate forest

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月26日

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  • Zhichun Yang,
  • Rossella Guerrieri,
  • Nan Ye,
  • Yilin Shao,
  • Fei Yu,
  • Tiezhu Jiao,
  • Huichun Yang,
  • Ji Chen,
  • Mianhai Zheng,
  • Ang Wang,
  • Qiulong Yin,
  • Zhanqing Hao,
  • Qiong Chen,
  • Zuoqiang Yuan

摘要

Forest ecosystem responses to nitrogen (N) deposition depend on N fate, yet most simulated N deposition experiments focus on understory addition, overlooking canopy N processes. Here we compared canopy (CAN) and understory (UAN) N addition in a secondary forest using a 15N tracer approach, adding 15N as 15NO3- or 15NH4+. Total 15N recovery was higher under UAN than CAN initially, but recoveries converged by day 365. CAN increased long-term N retention in woody biomass, with stems becoming the dominant sink, accounting for up to 34.9% of 15N recovered after one year. UAN promoted short-term N retention in understory layer and long-term N retention in soil. 15N recovery increased with soil depth under CAN but decreased under UAN from 120 to 365 days. Trees absorbed more 15NO3- than 15NH4+, whereas soil retained the two forms similarly. These findings indicate that N manipulation methods affect N retention magnitude and spatial distribution.