Flux of organic carbon in a riverine mangrove wetland in the Florida Coastal Everglades |
| |
Authors: | Melissa M Romigh Stephen E Davis III Victor H Rivera-Monroy Robert R Twilley |
| |
Institution: | (1) Department of Wildlife & Fisheries Sciences, Texas A&M University, 2258 TAMU, College Station, TX 77843, USA;(2) Department of Oceanography & Coastal Science, Wetland Biogeochemistry Institute, Louisiana State University, Baton Rouge, LA 70803, USA |
| |
Abstract: | Short-term (daily) and seasonal variations in concentration and flux of dissolved organic carbon (DOC) were examined over
15 tidal cycles in a riverine mangrove wetland along Shark River, Florida in 2003. Due to the influence of seasonal rainfall
and wind patterns on Shark River’s hydrology, samplings were made to include wet, dry and transitional (Norte) seasons. We
used a flume extending from a tidal creek to a basin forest to measure vertical (vegetated soil/water column) and horizontal
(mangrove forest/tidal creek) flux of DOC. We found significant (p < 0.05) variations in surface water temperature, salinity, conductivity, pH and mean concentration of DOC with season. Water
temperature and salinity followed seasonal patterns of air temperature and rainfall, while mean DOC concentration was highest
during the dry season (May), followed by the wet (October) and ‘Norte’ (December) seasons. This pattern of DOC concentration
may be due to a combination of litter production and inundation pattern of the wetland. In contrast to daily (between tides)
variation in DOC flux between the mangrove forest and tidal creek, daily variations of mean water quality were not significant.
However, within-tide variation of DOC flux, dissolved oxygen content and salinity was observed. This indicated that the length
of inundation and water source (freshwater vs. saltwater) variation across tidal cycles influenced water quality and DOC flux
in the water column. Net DOC export was measured in October and December, suggesting the mangrove forest was a source of DOC
to the adjacent tidal creek during these periods. Net annual export of DOC from the fringe mangrove to both the tidal creek
and basin mangrove forest was 56 g C m−2 year−1. The seasonal pattern in our flux results indicates that DOC flux from this mangrove forest may be governed by both freshwater
discharge and tidal range. |
| |
Keywords: | DOC mangrove forest wetland-water column fluxes Everglades National Park |
本文献已被 SpringerLink 等数据库收录! |
|