TY - JOUR
T1 - Changes in organic carbon accumulation driven by mangrove expansion and deforestation in a New Zealand estuary.
AU - Perez, Alexander
AU - Machado, Wilson
AU - Gutierrez, Dimitri
AU - Stokes, Debra
AU - Sanders, Luciana
AU - Smoak, Joseph M.
AU - Santos, Isaac
AU - Sanders, Christian J.
N1 - Perez, A.P, Machado, W., Gutierrez, D., Stokes, D., Sanders, L., Smoak, J.M., … Sanders, C.J. (2017). Changes in 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.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - 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 210 Pb and 239+240 Pu 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 (δ 13 C). 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.
AB - 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 210 Pb and 239+240 Pu 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 (δ 13 C). 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.
KW - Organic carbon, 210Pb, Mangroves
UR - https://digitalcommons.usf.edu/fac_publications/2336
UR - https://login.ezproxy.lib.usf.edu/login?url=http://www.sciencedirect.com/science/article/pii/S0272771416304097
M3 - Article
JO - Default journal
JF - Default journal
ER -