Coastal wetland ecosystems deliver large carbon stocks in tropical Mexico

Periodo de realización: 1900/01/01 al 2021/01/01

Tipo: Artículo científico

Lugar(es) de estudio: Chiapas, México, Tabasco, México, Veracruz, México
Resumen: "Tropical wetlands are important in the global carbon (C) cycle and climate system. To elaborate government policies that protect wetland ecosystem services, spatially explicit data on the existing C stocks are needed. This study quantified above and below ground C stocks in mangrove, swamp forests, marshes, and grazed wetlands in three different regions in Mexico (Veracruz, Tabasco/Campeche, and Chiapas states), using a combination of remote sensing techniques and field data collection. We report a 0.688 Gt C stock in the areas investigated showing that these wetlands hold important C stocks. The total C stock of Mexico’s wetlands is expected to be considerably larger as our study is not a complete survey of Mexico’s total wetland area. Across the three regions, the currently unprotected swamp forests and marshes had substantial peat deposits storing ˜ 0.232 and 0.375 Pg C, respectively. The high C stocks found in swamp forests (1801?±?283?Mg C ha-1) and marshes (1100?±?376?Mg C ha-1) are likely to be vulnerable to human interventions such as drainage. Flooded grasslands, used for grazing, had substantially lower C storage (271?±?122?Mg C ha-1), showing that grazed areas are less effective as C stores. Across sites the belowground C pool that was two orders of magnitude greater than the aboveground biomass C stocks. Carbon storage in wetland vegetation types differed among the three study regions, indicating the need for developing government policies considering a specific regional approach to protect the C stocks of coastal wetlands. Given that freshwater swamps had the greatest C stocks and freshwater marshes stored most C, these wetland peat deposits should be prioritized for conservation, via new legislation or inclusion in payment for ecosystem services schemes."

Información de ECOSUR