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Research Article | Open Access

Carbon stock estimation in halophytic wooded savannas of Uruguay: An ecosystem approach

Andrés Baiettoa( ), Andrés Hirigoyenb, Carolina Toranzaa, Franco Schinatoa, Maximiliano Gonzálezc, Rafael Navarro Cerrillod
Forest Department, Faculty of Agronomy, University of the Republic, Montevideo, PO 12900, Uruguay
National Research Program of Forest Production, National Agriculture Research Institute, Tacuarembó, PO 97000, Uruguay
Soil and Water Department, Faculty of Agronomy, University of the Republic, Montevideo, PO 12900, Uruguay
Department of Forestry Engineering, University of Cordoba, Córdoba, PO 14014, Spain
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Abstract

Savannas constitute a mixture of trees and shrub patches with a more continuous herbaceous understory. The contribution of this biome to the soil organic carbon (SOC) and above-ground biomass (AGB) carbon (C) stock globally is significant. However, they are frequently subjected to land use changes, promoting increases in CO2 emissions. In Uruguay, subtropical wooded savannas cover around 100, 000 ​ha, of which approximately 28% is circumscribed to sodic soils (i.e., subtropical halophytic wooded savannas). Nevertheless, there is little background about the contribution of each ecosystem component to the C stock as well as site-specific allometric equations. The study was conducted in 5 ​ha of subtropical halophytic wooded savannas of the national protected area Esteros y Algarrobales del Río Uruguay. This work aimed to estimate the contribution of the main ecosystem components (e.g., soil, trees, shrubs, and herbaceous plants) to the C stock. Site-specific allometric equations for the most frequent tree species and shrub genus were fitted based on basal diameter (BD) and total height (H). The fitted equations accounted for between 77% and 98% of the aerial biomass variance of Neltuma affinis and Vachellia caven. For shrubs (Baccharis sp.), the adjusted equation accounted for 86% of total aerial biomass. C stock for the entire system was 116.71 ​± ​11.07 ​Mg·ha−1, of which 90.7% was allocated in the soil, 8.3% in the trees, 0.8% in the herbaceous plants, and 0.2% in the shrubs. These results highlight the importance of subtropical halophytic wooded savannas as C sinks and their relevance in the mitigation of global warming under a climate change scenario.

Keywords

Carbon stockClimate changeBiomass modelingSodic soils

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Forest Ecosystems
Volume 11 Issue 4,
August 2024
Article number: 100216
DOI: 10.1016/j.fecs.2024.100216
Cite this article:
Baietto A, Hirigoyen A, Toranza C, et al. Carbon stock estimation in halophytic wooded savannas of Uruguay: An ecosystem approach. Forest Ecosystems, 2024, 11(4): 100216. https://doi.org/10.1016/j.fecs.2024.100216

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Received: 26 December 2023
Revised: 14 June 2024
Accepted: 14 June 2024
Published: 18 June 2024
© 2024 The Authors.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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