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Published (Version of record)CC BY-NC V4.0, Open Access
Published (Version of record)CC BY-NC V4.0, Open
Journal article
Factors Determining Seagrass Blue Carbon Across Bioregions and Geomorphologies
Global Biogeochemical Cycles, Vol.35(6), pp.1-17
06/2021
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Abstract
Seagrass meadows rank among the most significant organic carbon (Corg) sinks on earth. We examined the variability in seagrass soil Corg stocks and composition across Australia and identified the main drivers of variability, applying a spatially hierarchical approach that incorporates bioregions and geomorphic settings. Top 30 cm soil Corg stocks were similar across bioregions and geomorphic settings (min-max: 20–26 Mg Corg ha−1), but meadows formed by large species (i.e., Amphibolis spp. and Posidonia spp.) showed higher stocks (24–29 Mg Corg ha−1) than those formed by smaller species (e.g., Halodule, Halophila, Ruppia, Zostera, Cymodocea, and Syringodium; 12–21 Mg Corg ha−1). In temperate coastal meadows dominated by large species, soil Corg stocks mainly derived from seagrass Corg (72 ± 2%), while allochthonous Corg dominated soil Corg stocks in meadows formed by small species in temperate and tropical estuarine meadows (64 ± 5%). In temperate coastal meadows, soil Corg stocks were enhanced by low hydrodynamic exposure associated with high mud and seagrass Corg contents. In temperate estuarine meadows, soil Corg stocks were enhanced by high contributions of seagrass Corg, low to moderate solar radiation, and low human pressure. In tropical estuarine meadows formed by small species, large soil Corg stocks were mainly associated with low hydrodynamic energy, low rainfall, and high solar radiation. These results showcase that bioregion and geomorphic setting are not necessarily good predictors of soil Corg stocks and that site-specific estimates based on local environmental factors are needed for Blue Carbon projects and greenhouse gases accounting purposes.
Details
- Title
- Factors Determining Seagrass Blue Carbon Across Bioregions and Geomorphologies
- Creators
- Inés Mazarrasa - Edith Cowan UniversityPaul Lavery - Edith Cowan UniversityCarlos M Duarte - King Abdullah University of Science and Technology (KAUST)Anna Lafratta - CSIRO, Oceans and AtmosphereCatherine E Lovelock - The University of QueenslandPeter I Macreadie - Deakin University, Geelong, Burwood CampusJimena Samper‐Villarreal - Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Ciudad de la Investigación, Universidad de Costa RicaCristian Salinas - Edith Cowan UniversityChristian J Sanders - Southern Cross UniversityStacey Trevathan‐Tackett - Deakin University, Geelong, Burwood CampusMary Young - Deakin University, Geelong, Burwood CampusAndy Steven - CSIROOscar Serrano - Centro de Estudios Avanzados de Blanes, Consejo Superior de Investigaciones Científicas
- Publication Details
- Global Biogeochemical Cycles, Vol.35(6), pp.1-17
- Publisher
- Wiley-Blackwell Publishing, Inc.
- Number of pages
- 17
- Grant note
- Juan de la Cierva Scholarship, Spanish Ministry of Science, Innovation and Universities Jose Castillejo Scholarship, Spanish Ministry of Education, Culture and Sports. Grant Number: CAS18/00327 Holsworth Wildlife Research Endowment-Equity Trustees Charitable Foundation. Grant Number: G1003426 Australian Research Council (ARC DECRA). Grant Number: DE170101524, DP200100575, LP160100242 Deakin University’s ADPR Fellowship Fundacion Instituto de Hidraulica Ambiental de Cantabria and Gobierno de Cantabria (FENIX program)
- Identifiers
- 991012948592902368
- Copyright
- © 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
- Academic Unit
- School of Health and Human Sciences; Faculty of Science and Engineering; National Marine Science Centre; Science
- Language
- English
- Resource Type
- Journal article