Ecosystem-atmosphere CO2 exchange from semiarid mangroves in the Gulf of California. (January 2023)

• Record Type: Journal Article
• Authors: Vargas-Terminel, Martha L.; Rodríguez, Julio C.; Yépez, Enrico A.; Robles-Zazueta, Carlos A.; Watts, Christopher; Garatuza-Payán, Jaime; Vargas, Rodrigo; Sanchez-Mejia, Zulia M.
• Is Part Of: Journal of arid environments. Volume 208(2023)
• Publication Date: 2023-01
• Subjects: Sea of Cortez -- Eddy covariance -- MexFlux -- Blue carbon; Arid regions ecology -- Periodicals; Arid regions -- Periodicals; Écologie des régions arides -- Périodiques; Régions arides -- Périodiques; 577.54
• DOI: 10.1016/j.jaridenv.2022.104872
• Languages: English
• ISSNs: 0140-1963

Abstract

Abstract: Mangrove wetlands play an essential role as blue carbon ecosystems. However, worldwide they also face imminent threats caused by anthropogenic activities and climate change. Mangroves in the semiarid region of the Gulf of California are highly vulnerable to both threats. In this study, we present eddy covariance measurements of net ecosystem exchange of CO2 (NEE), gross primary productivity (GPP), and ecosystem respiration (Reco ) at a preserved mangrove (Estero El Sargento) and a site influenced by anthropogenic activities (Bahia del Tobari) located in northwest Mexico. Both sites were net annual carbon sinks but had different dynamics. The net annual carbon gain for Estero El Sargento was −717 g C m −2 y −1 while for Bahia deTobari was −247 g C m −2 y −1 . Over the studied year, Estero El Sargento had lower Reco (329 g C m −2 ) during the winter-spring months and an overall lower annual Reco /GPP (0.42) than Bahia de Tobari. The Reco was notably high during the winter-spring period at Bahia de Tobari when agriculture drainage from the intensive food production activities at the Yaqui Valley reaches the bay. The contrasting NEE patterns and magnitude between both mangrove sites suggest that anthropogenic activities influencing coastal ecosystems exert an important control on the CO2 sink potential. Highlights: Mangrove forests function as net C sink in regions with less than 200 mm of annual precipitation. Winter precipitation is important for Gross Primary Productivity in semiarid mangroves. Ecosystem respiration is high in mangroves influenced by agriculture drainage.