Legacy Effects of Long-Term Nitrogen Addition Sustain Elevated Nitrification Seven Years After Nutrient Input Cessation

文献类型： 外文期刊

第一作者： Xiao, Rui

作者： Xiao, Rui;Zheng, Shuwen;Shen, Yifan;Yan, Yushan;Li, Guoyong;Yang, Zhongling;Xiao, Rui;Li, Guoyong;Yang, Zhongling;Zhang, Yongpeng;Li, Junyong

作者机构：

关键词： Alpine meadow; ammonia oxidizers; legacy effects; nitrification; nutrient addition; nutrient cessation; recovery

期刊名称：ECOSYSTEMS （ 影响因子：3.3； 五年影响因子：3.9 ）

ISSN： 1432-9840

年卷期： 2025 年 28 卷 5 期

页码：

收录情况： SCI

摘要： Nitrogen (N) input enhances N transformations, resulting in harmful environmental impacts by accelerating N loss. However, it remains unclear whether the effects of long-term N inputs on N transformations persist after N addition was ceased. We examined the changes in the communities and activities of ammonia oxidizers in an alpine meadow that underwent 15 years of nutrient addition followed by 7 years of nutrient cessation. Our results showed that plant N, soil total N, and available N returned to control levels seven years after nutrient addition stopped, whereas nitrification rates, mean N2O emissions, and ammonia-oxidizing bacteria (AOB) abundance remained elevated. Network complexity among AOB, ammonia-oxidizing archaea (AOA), and comammox Nitrospira was higher in nutrient cessation plots than in control plots. The elevated soil nitrification pattern under nutrient addition was primarily driven by high soil N availability from exogenous N inputs. In contrast, under nutrient cessation, enhanced microbial N cycling sustained the elevated soil nitrification pattern. Therefore, our findings suggest that direct measurements of soil and plant N may not sufficiently capture the recovery of N transformations, and that legacy effects of nutrient addition on N cycling microbes and their activities may persist for many years.

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