Response of topsoil Fe-bound organic carbon pool and microbial community to Spartina alterniflora invasion in coastal wetlands
Lin, Meifen (Fujian Normal University. College of Life Science)
Chen, Yu (Fujian Normal University. College of Life Science)
Cheng, Liwen (Fujian Normal University. College of Life Science)
Zheng, Yi (Fujian Normal University. College of Life Science)
Wang, Weiqi (Fujian Normal University. Key Laboratory of Humid Subtropical Eco-geographical Process)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Song, Zhaoliang (Tianjin University. School of Earth System Science)
Guggenberger, Georg (Leibniz University. Institute of Soil Science)
Zou, Yuanchun (Northeast Institute of Geography and Agroecology (Changchun, Xina))
Ding, Xueli (Nanjing University of Information Science and Technology. School of Applied Meteorology)
Tariq, Akash (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography. State Key Laboratory of Desert and Oasis Ecology)
Zeng, Fanjiang (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography. State Key Laboratory of Desert and Oasis Ecology)
Fahad Alrefaei, Abdulwahed (King Saud University. Department of Zoology)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2023
Resum:	Wetland ecosystems have dual functions as both carbon (C) sources and C sinks, playing a vital role in the world's C budget. Wetlands are prone to suffer from plant invasions, and for example, Spartina alterniflora, a well-known invasive species, has rapidly expanded in coastal areas of Asia since 1979 and altered the C cycles in coastal wetland ecosystems. Fe(III) oxides are critical in the OC storage by formation of Fe-bound organic carbon (Fe-OC). But the impact of the invasion by S. alterniflora in coastal wetlands on the formation and stabilization of Fe-OC is poorly known. Herein, we assessed soil Fe species contents, Fe-OC pool, and the microbial communities associated with these processes in seven wetlands dominated by both native (Kandelia obovate, Avicennia marina and Phragmites australis) and invasive (S. alterniflora) plants. Our results showed that organical complexed Fe (Fep) concentration and Fe complexing index under S. alterniflora community were lower than that under native communities. Soil Fe-OC concentration and molar OC:Fe ratio decreased (35. 9% and 29. 3%, respectively) after S. alterniflora invasion in coastal wetlands, while the abundance of FeRB increased by 78. 6%. The invasion of S. alterniflora increased soil water content while decreased bulk density, and these changes could have important effects on Fe species and FeRB abundance. Moreover, Fe-OC was positive correlated with soil organic carbon (SOC), Fep, and Fe(III), indicating that SOC and Fe(III) concentrations directly affect the formation of Fe-OC. FeRB reacted on the combination of Fe (hydr-) oxides and SOC to indirectly affect Fe-OC through dissimilatory Fe reduction, which further determined the stabilization and mineralization of SOC. Taken together, the invasion of S. alterniflora hindered the generation and accumulation of soil Fe-OC pool weakening the stabilization of SOC in coastal wetlands. Therefore, the conservation and restoration of mangroves and other coastal wetlands provide a promising strategy for SOC sequestration and climate change mitigation.
Ajuts:	Agencia Estatal de Investigación PID2019-110521GB-I00 Agencia Estatal de Investigación PID2020-115770RB-I Agència de Gestió d'Ajuts Universitaris i de Recerca SGR/2017-1005
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Coastal wetlands ; Carbon-cycle ; Fe-bound organic carbon ; Plant invasion ; Spartina alterniflora
Publicat a:	Catena, Vol. 232 (Nov. 2023) , art. 107414, ISSN 1872-6887

DOI: 10.1016/j.catena.2023.107414

Disponible a partir de: 2025-11-30 Postprint

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