Losses and destabilization of soil organic carbon stocks in coastal wetlands converted into aquaculture ponds
Lin, Shaoying (Fujian Normal University. Key Laboratory of Humid Subtropical Eco-Geographical Process)
Zhou, Yaxin (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)
Li, Yuan (Yantai Institute of Coastal Zone Research)
Fu, Chuancheng (King Abdullah University of Science and Technology. Red Sea Research Center)
Zeng, Fanjiang (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography)
Song, Zhaoliang (Tianjin University. Institute of Surface-Earth System Science)
Tariq, Akash (Chinese Academy of Sciences. Xinjiang Institute of Ecology and Geography)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2024
Resum:	Coastal-wetlands play a crucial role as carbon (C) reservoirs on Earth due to their C pool composition and functional sink, making them significant for mitigating global climate change. However, due to the development and utilization of wetland resources, many wetlands have been transformed into other land-use types. The current study focuses on the alterations in soil organic-C (SOC) in coastal-wetlands following reclamation into aquaculture ponds. We conducted sampling at 11 different coastal-wetlands along the tropical to temperate regions of the China coast. Each site included two community types, one with solely native species (Suaeda salsa, Phragmites australis and Mangroves) and the other with an adjacent reclaimed aquaculture pond. Across these 11 locations we compared SOC stock, active OC fractions, and soil physicochemical properties between coastal wetlands and aquaculture ponds. We observed that different soil uses, sampling sites, and their interaction had significant effects on SOC and its stock (p < . 05). Reclamation significantly declined SOC concentration at depths of 0-15 cm and 15-30 cm by 35. 5% and 30. 3%, respectively, and also decreased SOC stock at 0-15 cm and 15-30 cm depths by 29. 1% and 37. 9%, respectively. Similar trends were evident for SOC stock, labile organic-C, dissolved organic-C and microbial biomass organic-C concentrations (p < . 05), indicating soil C-destabilization and losses from soil following conversion. Soils in aquaculture ponds exhibited higher bulk density (BD; 11. 3%) and lower levels of salinity (61. 0%), soil water content (SWC; 11. 7%), total nitrogen (TN) concentration (23. 8%) and available-nitrogen concentration (37. 7%; p < . 05) than coastal-wetlands. Redundancy-analysis revealed that pH, BD and TN concentration were the key variables most linked with temporal variations in SOC fractions and stock between two land use types. This study provides a theoretical basis for the rational utilization and management of wetland resources, the achievement of an environment-friendly society, and the preservation of multiple service functions within wetland ecosystems.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Active OC fractions ; Coastal wetland ; Reclaimed aquaculture pond ; Soil organic carbon (SOC)
Publicat a:	Global change biology, Vol. 30, issue 9 (September 2024) , art. e174802024, ISSN 1365-2486

DOI: 10.1111/gcb.17480

Postprint 36 p, 361.3 KB

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