Contrasting change trends in dry and wet nitrogen depositions during 2011 to 2020: evidence from an agricultural catchment in subtropical Central China

Jiang, Wenqian; Shen, Jianlin; Li, Yong; Wang, Juan; Gong, Dianlin; Zhu, Xiao; Liu, Xuejun; Liu, Ji; Reis, Stefan ORCID: https://orcid.org/0000-0003-2428-8320; Zhu, Qihong; Wu, Jinshui. 2024 Contrasting change trends in dry and wet nitrogen depositions during 2011 to 2020: evidence from an agricultural catchment in subtropical Central China. Science of The Total Environment, 907, 168094. 10, pp. https://doi.org/10.1016/j.scitotenv.2023.168094

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Abstract/Summary

Over the past decade, China has experienced a decline in atmospheric reactive nitrogen (Nr) emissions. Given that China's subtropical region is a significant nitrogen (N) deposition hotspot, it is essential to accurately quantify the ten-year variations in dry and wet N depositions in the context of reductions in atmospheric Nr emissions. Here, we evaluated the spatiotemporal variation in N deposition on forest, paddy field and tea field ecosystems in a typical subtropical agricultural catchment from 2011 to 2020. Our findings indicated a significant decrease in total N deposition in both the tea field ecosystem (41.5–30.5 kg N ha−1) and the forest ecosystem (40.8–25.7 kg N ha−1) (P < 0.05), but no significant change in the paddy field ecosystem (29.3–32.9 kg N ha−1). Specifically, dry N deposition exhibited significant declines except in the paddy field ecosystem, whereas wet N deposition had no significant change. The reduction in total oxidized and reduced N depositions in forest and tea field ecosystems is attributed to the decrease in NOx and NH3 emissions. Additionally, The ratio of NHx deposition to total N deposition all exceeded 0.5 in three ecosystems and the NHx/NOy ratio had an increasing trend (P < 0.05) in the paddy field, indicating that reactive N emissions from agricultural sources were the primary contributor to overall N deposition. Our study emphasizes that despite the decreasing trend in N deposition, it still exceeds the critical loads of natural ecosystems and requires stringent N emissions control, particularly from agricultural sources, in the future.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.scitotenv.2023.168094
UKCEH and CEH Sections/Science Areas:	UKCEH Fellows
ISSN:	0048-9697
Additional Keywords:	nitrogen deposition, wet deposition, dry deposition, temporal variations, nitrogen cycling
NORA Subject Terms:	Agriculture and Soil Science Atmospheric Sciences
Date made live:	28 Nov 2023 11:45 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/536339

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