Skip to main content
Article
Changes in soil organic carbon accumulation driven by mangrove expansion and deforestation in a New Zealand estuary.
Faculty Publications
  • Alexander Perez
  • Wilson Machado
  • Dimitri Gutierrez
  • Debra Stokes
  • Luciana Sanders
  • Joseph M. Smoak
  • Isaac Santos
  • Christian J. Sanders
SelectedWorks Author Profiles:

Joseph M. Smoak

Document Type
Article
Publication Date
2017
Abstract
Mangroves are rapidly being lost to deforestation in many locations while expanding their areal extent in other subtropical and temperate regions. Currently, there is a paucity of information on how these changes may alter the carbon accumulation capacity of coastal areas. Here, sediment cores were collected from two areas and used to determine the influence of mangrove migration and deforestation on sediment carbon stocks and accumulation rates. The deforested area contained lower sedimentary organic carbon stocks (2767 ± 580 g m−2) compared to the preserved area (6949 ± 84 g m−2). Sediment accumulation rates, derived from excess 210Pb and 239+240Pu depositional signatures, ranged from 0.19 to 0.35 cm yr−1. The total sedimentary organic carbon (TOC) accumulation rates for the period after mangrove deforestation (2005–2011) exhibited significant differences between preserved areas (Core C: 43.9 ± 6.9 g m−2 yr−1; Core D: 83.1 ± 5.9 g m−2 yr−1) and the deforested area (Core B: 25.8 ± 6.0 g m−2 yr−1), suggesting a decline after deforestation. For the preserved area, the TOC accumulation under mangrove dominance (65.5 ± 16.3 g m−2 yr−1, after 1944) was higher than under saltmarsh dominance (23.5 ± 15.9 g m−2 yr−1, before 1944), as revealed by carbon isotopic signatures (δ13C). The increase in the TOC accumulation due to mangrove expansion in this New Zealand estuary was conservatively estimated as three-fold higher, and two-fold higher in stocks in comparison to the period when this ecosystem was dominated by non-mangrove vegetation.
Comments

Abstract only. Full-text article is available through licensed access provided by the publisher. Published in Estuarine, Coastal and Shelf Science, 192, 108-116. doi: 10.1016/j.ecss.2017.05.009. Members of the USF System may access the full-text of the article through the authenticated link.

Language
en-US
Publisher
Academic Press
Creative Commons License
Creative Commons Attribution-Noncommercial-No Derivative Works 4.0
Citation Information
Perez, A.P, Machado, W., Gutierrez, D., Stokes, D., Sanders, L., Smoak, J.M., … Sanders, C.J. (2017). Changes in soil organic carbon accumulation driven by mangrove expansion and deforestation in a New Zealand estuary. Estuarine, Coastal and Shelf Science, 192, 108-116. doi: 10.1016/j.ecss.2017.05.009.