Work

A mechanistic mangrove ecosystem model for evaluating carbon absorption, fixation, and storage functions across daily to seasonal timescales

Year: 2025

Type: article

Abstract: Mangrove ecosystems function as important carbon sinks; however, accurately quantifying their carbon dynamics remains challenging because of the complex interplay of tidal fluctuations, sediment–water interface interactions, and biogeochemical cycling. Many existing models lack the temporal resolution and mechanistic precision necessary to adequately capture these dynamic processes, particularly in intertidal environments. To address this issue, we developed a mangrove ecosystem model [EMAGIN-B.C_MG] by incorporating mangrove physiology and tidal hydrodynamics into the EMAGIN-B.C. model, which represents benthic–pelagic coupled ecosystems, including phytoplankton, benthic algae, zooplankton, benthic fauna, detritus, and nutrients, through biological, chemical, and physical processes. Model validation was conducted by comparing the results with time series observations of dissolved inorganic carbon (DIC), total alkalinity (TA), and dissolved oxygen, as well as annual carbon flux measurements. Simulation results showed that carbon absorption and fixation increased during spring and summer because of enhanced photosynthetic activity, whereas carbon storage remained relatively stable throughout the year. Residual ponding during ebb tide significantly influenced DIC and TA concentrations via benthic mineralization and calcium carbonate (CaCO₃) dissolution. Comparative analysis revealed that the presence of mangroves increased carbon absorption, fixation, and storage by factors of 9, 3, and 6, respectively. These findings demonstrate that high-temporal resolution ecosystem models can effectively reproduce key material cycling functions of mangrove ecosystems and contribute to more accurate assessments of Blue Carbon dynamics in intertidal wetlands. EMAGIN-B.C_MG provides a novel framework for evaluating the carbon mitigation potential of mangroves in the context of climate change.

Source: Ecological Modelling

DOI: 10.1016/j.ecolmodel.2025.111400

Authors: Wataru Shimura, Akihito Ryogoku, Hisashi Shibuki, Akio Sohma

Institutions: Osaka Metropolitan University, Osaka City University

Language: English

Topic: Coastal wetland ecosystem dynamics

Subfield: Ecology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Climate action, Life below water

Open Access status: hybrid

Estimated APC paid: $2,810