Characteristics of wet nitrogen deposition and its response to COVID-19 in Danjiangkou reservoir area: A strategic water resource in China

IF 6 2区工程技术 Q1 ENVIRONMENTAL SCIENCES

Urban Climate Pub Date : 2025-03-01 DOI:10.1016/j.uclim.2025.102354

Haoxin Jia , Pan Huo , Xinyu Zhang , Jibao Chen , Pengcheng Gao

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引用次数: 0

Abstract

Atmospheric nitrogen deposition is crucial to global nitrogen cycles, yet its spatiotemporal dynamics and sensitivity to environmental perturbations in large reservoir remain inadequately understood. This study investigated the impact of COVID-19, a significant environmental health event, on wet nitrogen deposition in Danjiangkou Reservoir, China. From 2018 to 2021, we monitored total nitrogen (TN), nitrate nitrogen (NO₃⁻-N), and ammonium nitrogen (NH₄⁺-N) at two distinct sites: Xichuan (urban) and Qushou (rural). The results revealed significant spatial and temporal variations, with Qushou (rural) exhibiting higher TN and NH₄⁺-N fluxes, reaching 19.99 kg/(hm² a) and 9.92 kg/(hm² a), respectively, likely due to intensive agricultural practices. Conversely, Xichuan (urban) recorded fluxes of 17.66 kg/(hm²·a) for TN and 7.58 kg/(hm²·a) for NH₄⁺-N. No significant regional difference was observed for NO₃⁻-N deposition. The implementation of COVID-19 lockdown led to a marked reduction in nitrogen deposition, particularly at the urban site, where TN, NO₃⁻-N, and NH₄⁺-N fluxes decreased by 29.4 %, 32 %, and 52.7 % respectively. However, a subsequent resurgence in nitrogen deposition was observed with the easing of restrictions, highlighting the challenges in sustaining environmental improvements during periods of economic recovery. These findings highlight the need for targeted nitrogen management strategies to protect water quality in reservoir areas.

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来源期刊

Urban Climate Social Sciences-Urban Studies

CiteScore

9.70

自引率

9.40%

发文量

286

期刊介绍： Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]