数字农科院2.0

Resin-coated urea effectively simulates the chronic dynamics of natural nitrogen deposition

文献类型： 外文期刊

作者： Zhao, Yi;Ke, Yuguang;Wu, Honghui;Xu, Chong;Li, Xiwen;Hautier, Yann;Borer, Elizabeth T.;Yu, Qiang

作者机构：

关键词： biodiversity;coated fertilizer;ecosystem function;ecosystem processes;global change;N deposition;nitrogen addition;simulating experiment

期刊名称： METHODS IN ECOLOGY AND EVOLUTION

ISSN： 2041-210X

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Atmospheric nitrogen (N) deposition has more than tripled globally since the Industrial Revolution. Experiments usually simulate N deposition using fast-release N fertilizers applied once or several times a year. However, these pulses differ from the continuous N supply of natural deposition, which may lead to different outcomes. There is an urgent need for methodologies that more accurately replicate continuous N deposition to better understand its causal impacts on future biological outcomes. We developed a resin-coated slow-release urea to stimulate the continuous N deposition dynamics in semiarid grasslands. Three urea ball sizes with varying resin coating thicknesses were designed to achieve year-long release. We then compared the N release rate of the coated fertilizer to rate of natural N deposition to assess its effectiveness in replicating the temporal pattern of N deposition. Our results showed that under the semiarid conditions of our site, the resin-coated urea with a 0.5 mm coating on 4 mm diameter balls released urea continuously for approximately 12 months. The temporal pattern of N release rate of the fertilizer was very similar to local atmospheric N deposition. There was a strong positive relationship between N release rates and N deposition (R2 = 0.80), with both exhibiting simultaneous peaks and valleys. Our results indicate that resin-coated urea with a pellet size and coating thickness determined by local site conditions can effectively simulate the temporal dynamics of N deposition. Coated urea provides a far more effective approach for experimentally simulating future impacts of elevated N deposition on ecosystem function and processes compared to fast-release fertilizers.

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