TY - JOUR
T1 - Elevated rates of organic carbon, nitrogen, and phosphorus accumulation in a highly impacted mangrove wetland
AU - Sanders, Christian J.
AU - Eyre, Bradley D.
AU - Santos, Isaac R.
AU - MacHado, Wilson
AU - Luiz-Silva, Wanilson
AU - Smoak, Joseph M.
AU - Breithaupt, Joshua L.
AU - Ketterer, Michael E.
AU - Sanders, Luciana
AU - Marotta, Humberto
AU - Silva-Filho, Emmanoel
PY - 2014/4/16
Y1 - 2014/4/16
N2 - The effect of nutrient enrichment on mangrove sediment accretion and carbon accumulation rates is poorly understood. Here we quantify sediment accretion through radionuclide tracers to determine organic carbon (OC), total nitrogen (TN), and total phosphorus (TP) accumulation rates during the previous 60-years in both a nutrient-enriched and a pristine mangrove forest within the same geomorphological region of southeastern Brazil the forest receiving high nutrient loads has accumulated OC, TN, and TP at rates that are fourfold, twofold, and eightfold respectively, higher than those from the undisturbed mangrove. Organic carbon and TN stable isotopes (δ13C and δ15N) reflect an increased presence of organic matter (OM) originating with either phytoplankton, benthic algae, or another allochthonous source within the more rapidly accumulated sediments of the impacted mangrove. This suggests that the accumulation rate of OM in eutrophic mangrove systems may be enhanced through the addition of autochthonous and allochthonous nonmangrove material. Key Points High OC, N and P accumulation from impacted compared to pristine mangrove Carbon and N stable isotopes indicate diversified source of OM Mangrove migration may increase global OC, N, and P burial rates
AB - The effect of nutrient enrichment on mangrove sediment accretion and carbon accumulation rates is poorly understood. Here we quantify sediment accretion through radionuclide tracers to determine organic carbon (OC), total nitrogen (TN), and total phosphorus (TP) accumulation rates during the previous 60-years in both a nutrient-enriched and a pristine mangrove forest within the same geomorphological region of southeastern Brazil the forest receiving high nutrient loads has accumulated OC, TN, and TP at rates that are fourfold, twofold, and eightfold respectively, higher than those from the undisturbed mangrove. Organic carbon and TN stable isotopes (δ13C and δ15N) reflect an increased presence of organic matter (OM) originating with either phytoplankton, benthic algae, or another allochthonous source within the more rapidly accumulated sediments of the impacted mangrove. This suggests that the accumulation rate of OM in eutrophic mangrove systems may be enhanced through the addition of autochthonous and allochthonous nonmangrove material. Key Points High OC, N and P accumulation from impacted compared to pristine mangrove Carbon and N stable isotopes indicate diversified source of OM Mangrove migration may increase global OC, N, and P burial rates
KW - accumulation rates
KW - chronostatigraphy
KW - coastal Brazil
KW - coastal eutrophication
KW - mangrove
KW - plutonium
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U2 - 10.1002/2014GL059789
DO - 10.1002/2014GL059789
M3 - Article
AN - SCOPUS:84897956453
SN - 0094-8276
VL - 41
SP - 2475
EP - 2480
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 7
ER -