Denitrification rates in tidal marsh soils : the roles of soil texture, salinity and nitrogen enrichment
Hu, Minjie (Fujian Normal University)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Huang, Jiafang (Fujian Normal University)
Xu, Kang (Fujian Normal University)
Tong, Chuan (Fujian Normal University)

Data:	2020
Resum:	The denitrification rates of freshwater and oligohaline tidal marsh soils with different textures (loam and sandy soils) in a subtropical estuary, and their responses to nitrogen (N) loading, were investigated. In both marshes, the denitrification rates varied significantly with the season only in loam soil. The denitrification rates were highest in oligohaline marsh loam soil and lowest in freshwater marsh sandy soil. NH4NO3 addition significantly increased the denitrification rates of all the marsh soils. Our findings suggest that soil texture, soil organic matter (OM) content and low-level increases in salinity all had large effects on denitrification, indicating that the dynamics of denitrification rates in estuarine marshes with low-level salinity were controlled by the interaction of salinity and soil texture but mainly depended on OM content. We propose that denitrification in tidal marshes plays an important role in regulating current and future N loading into estuary and inshore coastal waters, especially for tidal freshwater marshes, which introduces great uncertainty into the N dynamics of estuaries under global changes.
Ajuts:	European Commission 610028 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1005 Ministerio de Economía y Competitividad CGL2016-79835-P
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Denitrification ; Estuarine tidal marsh ; Nitrogen enrichment ; Organic matter ; Salinity ; Soil texture
Publicat a:	European journal of soil science, 2020 , ISSN 1365-2389

DOI: 10.1111/ejss.12956

Postprint 19 p, 989.5 KB

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