Chronic nitrogen enrichment decreases soil gross nitrogen mineralization by acidification in topsoil but by carbon limitation in subsoil

•Soil gross N mineralization decreased with increasing N addition at all soil depths.•The decreased gross N mineralization was caused by acidification in topsoil.•The decreased gross N mineralization was caused by C limitation in subsoil. Continuously increasing nitrogen (N) deposition alters soil N...

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Bibliographic Details
Published in:Geoderma 2022-12, Vol.428, p.116159, Article 116159
Main Authors: Song, Lei, Wang, Jinsong, Pan, Junxiao, Yan, Yingjie, Niu, Shuli
Format: Article
Language:English
Subjects:
Carbon limitation
Chronic nitrogen deposition gradient
Deep soil
Grassland
Gross rate
Soil nitrogen mineralization
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Summary:•Soil gross N mineralization decreased with increasing N addition at all soil depths.•The decreased gross N mineralization was caused by acidification in topsoil.•The decreased gross N mineralization was caused by C limitation in subsoil. Continuously increasing nitrogen (N) deposition alters soil N mineralization, which is of vital importance in regulating soil N availability and satisfying plant N demands. Neither the response pattern of soil N mineralization to the chronic N enrichment nor the related mechanism has been well studied, particularly in deep soils. In this study, we measured the gross N mineralization rate (GNMR) as well as the corresponding soil abiotic and biotic properties along a chronic N addition gradient (7 years) at different soil depths in an alpine meadow. The results showed that GNMR was negatively correlated with the N addition rate and soil available NO3– content at each soil depth (P 
ISSN:0016-7061
1872-6259
DOI:10.1016/j.geoderma.2022.116159