Abstract
Seasonally flooded, freshwater cypress-tupelo wetlands, dominated by baldcypress (Taxodium distictum), water tupelo (Nyssa aquatica), and swamp tupelo (Nyssa sylvatica var. biflora) are commonly found in coastal regions of the southeastern United States. These wetlands are threatened due to climate change, sea level rise, and coastal urban development. Understanding the natural biogeochemical cycles of nutrients in these forested wetlands as ecosystems services such as carbon sequestration and nitrogen processing can provide important benchmarks to guide conservation plans and restoration goals. In this study, surface water and soil pore water samples were collected weekly from a cypress-tupelo wetland near Winyah Bay, South Carolina and analyzed for dissolved organic carbon (DOC), dissolved organic nitrogen (DON), inorganic nitrogen, and phosphate during its flooding period between October 2010 and May 2011. DOC was further characterized by specific ultra-violet absorbance at 254 nm, spectral slope ratio (SR) (ratio of two spectral slopes between 275–295 nm and 350–400 nm), E2/E3 ratio (ratio between A254 and A365), and fluorescence excitation-emission matrix. In addition, litterfall was collected on a monthly basis for a year while the biomass of the detritus layer (i.e., decomposed duff lying on the wetland floor) was determined before and after the flooding period. Results of the field study showed that concentrations of DOC, DON, NH4 +–N, and (NO2 − + NO3 −)–N in the surface water were generally higher during the fall, or peak litterfall season (October to December), than in the spring season (March to May). Highest concentrations of 54.8, 1.48, 0.270, and 0.0205 mg L−1, for DOC, DON, NH4 +–N, and (NO2 − + NO3 −)–N respectively, in surface waters were recorded during October. Lower SUVA, but higher SR and E2/E3 ratios of DOC, were observed at the end of the flooding season comparing to the initial flooding, suggesting the wetland system converts high aromatic and large DOC molecules into smaller and hydrophilic fractions possibly through photochemical oxidation. A similar trend was observed in soil pore water, but the pore water generally had greater and relatively stable concentrations of dissolved nutrients than surface water. No obvious temporal trend in phosphate concentration and total nitrogen to total phosphorus ratio (N:P) were found. Results of the laboratory extraction and mass balance calculation suggested fresh litter was a major source of DOC whereas decomposed duff was the source of dissolved nitrogen in surface water. In summary, the biogeochemistry of this isolated cypress-tupelo wetland is not only driven by the vegetation within the wetland system but also by hydrology and weather conditions such as groundwater table position, precipitation, and temperature.
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References
Abe K (2010) Desorptive behavior of phosphate in the subtropical Miyara River, Ishigaki Island. Jpn Limnol 11(2):179–183
Allen J, Lu K (2003) Modeling and prediction of future urban growth in the Charleston region of South Carolina: a GIS-based integrated approach. Conserv Ecol 8(2): ARTN 2
Anderson CJ, Lockaby BG (2007) Soils and biogeochemistry of tidal freshwater forested wetlands. In: Conner WH et al (eds) Ecology of tidal freshwater forested wetlands of the southeastern United States. Springer, Dordrecht, pp 65–88
Anderson CJ, Lockaby BG (2011) Foliar nutrient dynamics in tidal and non-tidal freshwater forested weltand. Aquat Bot 95(2):153–160
Battle JM, Golladay SW (2001) Hydroperiod influence on breakdown of leaf litter in cypress-gum wetlands. Am Midl Nat 146:128–145
Battle JM, Golladay SW (2007) How hydrology, habitat type, and litter quality affect lead breakdown in wetlands on the Gulf coastal plain of Georgia. Wetlands 27(2):251–260
Bridgham SD, Megonigal JP, Keller JK, Bliss NB, Trettin C (2006) The carbon balance of North American wetlands. Wetlands 26(4):889–916
Busbee WS, Conner WH, Allen DM, Lanham JD (2003) Composition and aboveground productivity of three seasonally flooded depressional forested wetlands in coastal South Carolina. Southeast Nat 2(3):335–346
Chambers RM, Odum WE (1990) Porewater oxidation, dissolved phosphate and the iron curtain: iron-phosphorus relations in tidal freshwater marshes. Biogeochemistry 10:37–52
Chen W, Westerhoff P, Leenheer JA, Booksh K (2003) Fluorescence excitation—emission matrix regional integration to quantify spectra for dissolved organic matter. Environ Sci Technol 37(24):5701–5710
Chow AT, Tanji KK, Gao SD (2003) Production of dissolved organic carbon and trihalomethane precursors from peat soils. Water Res 37(18):4475–4485
Chow AT, Tanji KK, Gao SD, Dahlgren RA (2006) Temperature, water content and wet-dry cycle effects on DOC production and carbon mineralization in agricultural peat soils. Soil Biol Biochem 38(3):477–488
Chow AT, Dahlgren RA, Zhang Q, Wong PK (2008) Relationships between specific ultraviolet absorbance and trihalomethane precursors of different carbon sources. J Water Supply Res T 57(7):471–480
Chow AT, Lee ST, O’Geen AT, Orozco T, Beaudette D, Wong PK, Hernes PJ, Tate KW, Dahlgren RA (2009) Litter contributions to dissolved organic matter and disinfection byproduct precursors in California oak woodland watersheds. J Environ Qual 38(6):2334–2343
Chow AT, O’Geen AT, Dahlgren RA, Diaz FJ, Wong KH, Wong PK (2011) Reactivity of litter leachates from California oak woodlands in the formation of disinfection by-products. J Environ Qual 40(5):1607–1616
Craft CB, Casey WP (2000) Sediment and nutrient accumulation in floodplain and depressional freshwater wetlands of Georgia. USA Wetlands 20(2):323–332
Cory RM, McKnight DM (2005) Fluorescence spectroscopy reveals ubiquitous presence of oxidized and reduced quinones in dissolved organic matter. Environ Sci Technol 39(21):8142–8149
Cory RM, Miller MP, McKnight DM, Guerard JJ, Miller PL (2010) Effect of instrument-specific response on the analysis of fulvic acid fluorescence spectra. Limnol Oceanogr-Method 8:67–78
Dai J (2012) Application of microbial fuel cell in forested wetland. MS thesis. Clemson University, South Carolina, USA
Dai Z, Amatya DM, Sun G, Trettin CC, Li C, Li H (2011) Climate variability and its impacts on forest hydrology on South Carolina Coastal Plain. USA Atmosphere 2(3):330–357
Dalrymple RM, Carfagno AK, Sharpless CM (2010) Correlations between dissolved organic matter optical properties and quantum yields of singlet oxygen and hydrogen peroxide. Environ Sci Technol 44(15):5824–5829
Davis SE, Childers DL, Noe GB (2006) The contribution of leaching to the rapid release of nutrients and carbon in the early decay of wetland vegetation. Hydrobiologia 569:87–97
Day FP (1982) Litter decomposition rates in the seasonally flooded great dismal swamp. Ecology 63(3):670–678
Doyle TW, O’Neil CP, Melder MPV, From AS, Palta MM (2007a) Tidal freshwater swamps of the Southeastern United States: effects of land use, hurricanes, sea-level rise, and climate change. In: Conner WH et al (eds) Ecology of tidal freshwater forested wetlands of the southeastern United States. Springer, Dordrecht, pp 1–28
Doyle TW, Conner WH, Ratard M, Inabinette LW (2007b) Assessing the impacts of tidal flooding and salinity on long-term growth of baldcypress under changing climate and riverflow. In: Conner WH et al (eds) Ecology of tidal freshwater forested wetlands of the Southeastern United States. Springer, Dordrecht, pp 441–446
Eaton AD, Clesceri LS, Rice EW, Greenberg AE (2005) Standard methods for examination of water and wastewater, 21st edn. American Public Health Association, American Water Works Association, and Water Pollution Control Federation, Washington, DC
Froelich PN (1988) Kinetic control of dissolved phosphate in natural rivers and estuaries: a primer on the phosphate buffer mechanism. Limnol Oceanogr 33(4):649–668
Gardner LR, Smith BR, Michener WK (1992) Soil evolution along a forest salt-marsh transect under a regime of slowly rising sea-level, southeastern United-States. Geoderma 55(1–2):141–157
Ghani A, Dexter M, Perrott KW (2003) Hot-water extractable carbon in soils: a sensitive measurement for determining impacts of fertilisation, grazing and cultivation. Soil Biol Biochem 35:1231–1243
Goni MA, Thomas KA (2000) Sources and transformations of organic matter in surface soils and sediments from a tidal estuary (North Inlet, South Carolina, USA). Estuaries 23(4):548–564
Goni MA, Teixeira MJ, Perkey DW (2003) Sources and distribution of organic matter in a river-dominated estuary (Winyah Bay, SC, USA). Estuar Coast Shelf S 57(5–6):1023–1048
Hayashi M (2004) Temperature-electrical conductivity relation of water for environmental monitoring and geophysical data inversion. Environ Monit Assess 96(1–3):119–128
Helms JR, Stubbins A, Ritchie JD, Minor EC, Kieber DJ, Mopper K (2008) Absorption spectral slopes and slope ratios as indicators of molecular weight, source, and photobleaching of chromophoric dissolved organic matter. Limnol Oceanogr 53(3):955–969
Hishi T, Birobe M, Tateno R, Takeda H (2004) Spatial and temporal patterns of water-extractable organic carbon (WEOC) of surface mineral soil in a cool temperate forest ecosystem. Soil Biol Biochem 36:1731–1737
Krauss KW, Duberstein JA, Doyle TW, Conner WH, Day RH, Inabinette LW, Whitbeck JL (2009) Site condition, structure, and growth of baldcypress along tidal/non-tidal salinity gradients. Wetlands 29(2):505–519
Loiselle SA, Bracchini L, Cozar A, Dattilo AM, Tognazzi A, Rossi C (2009) Variability in photobleaching yields and their related impacts on optical conditions in subtropical lakes. J Photochem Photobiol B 95(2):129–137
Morris JT, Sundareshwar PV, Nietch CT, Kjerfve B, Cahoon DR (2002) Responses of coastal wetlands to rising sea level. Ecology 83(10):2869–2877
Ozalp M, Conner WH, Lockaby BG (2007) Above-ground productivity and litter decomposition in a tidal freshwater forested wetland on Bull Island, SC. USA For Ecol Manag 245(1–3):31–43
Rahmstorf S (2007) A semi-empirical approach to projecting future sea-level rise. Science 315(5810):368–370
SCDNR (2011) South Carolina Department of Natural Resources. http://www.dnr.sc.gov/climate/sco/ClimateData/sc_historical_climate_data.php
Semlitsch RD, Bodie JR (1998) Are small, isolated wetlands expendable? Conserv Biol 12(5):1129–1133
Snodgrass JW, Komoroski MJ, Bryan AL, Burger J (2000) Relationships among isolated wetland size, hydroperiod, and amphibian species richness: implications for wetland regulations. Conserv Biol 14(2):414–419
Stuckey BN (1982) Soil survey of Georgetown county, South Carolina. USDA Soil Conservation Service, Georgetown
Sutter RD, Kral R (1994) The ecology, status, and conservation of two non-alluvial wetland communities in the south Atlantic and eastern Gulf coastal plain. USA Biol Conserv 68(3):235–243
Tiner RW, Bergquist HC, DeAlessio GP, Starr MJ (2002) Geographically isolated wetlands: a preliminary assessment of their characteristics and status in selected areas of the United States. US Fish and Wildlife Service, Northeast Region
Titus JG, Narayanan V (1996) The risk of sea level rise. Climatic Change 33(2):151–212
Titus JG, Richman C (2001) Maps of lands vulnerable to sea level rise: modeled elevations along the US Atlantic and Gulf coasts. Climate Res 18(3):205–228
Waiser MJ, Robarts RD (2004) Photodegradation of DOC in a shallow prairie wetland: evidence from seasonal changes in DOC optical properties and chemical characteristics. Biogoechemistry 9(2):263–284
Watt KM, Golladay SW (1999) Organic matter dynamics in seasonally inundated, forested wetalnds of the Gulf Coastal Plain. Wetlands 19(1):139–148
Weishaar JL, Aiken GR, Bergamaschi BA, Fram MS, Fujii R, Mopper K (2003) Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon. Environ Sci Technol 37(20):4702–4708
Williams TM, Wolaver TG, Dame RF, Spurrier JD (1992) The Bly Creek ecosystem study—organic carbon transport within a euhaline salt marsh basin, North Inlet, South Carolina. J Exp Mar Biol Ecol 163:125–139
Wolaver TG, Hutchinson S, Marozas M (1986) Dissolved and particulate organic-carbon in the North Inlet Estuary, South-Carolina—what controls their concentrations. Estuaries 9(1):31–38
Wang JJ, Conner WH, Chow AT (unpublished data) Potential positive feedback to climate change: Accelerated leaf litter decomposition in hurricane-damaged coastal baldcypress-water tupelo swamp. Submitted to Wetlands
Williams TM, Chow AT, Song B (Submitted) Rates of historical wetland change associated with moderate rise of relative sea level: a case study in Winyah Bay, South Carolina. Submitted to Wetland Science and Practice
Zhou J, Wang JJ, Baudon A, Chow AT (Submitted) Improved fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter. Submitted to Chemosphere
Zsolnay A (2003) Dissolved organic matter: artefacts, definitions, and functions. Geoderma 113:187–209
Acknowledgments
Authors would like to thank Leah Gregory for assisting in laboratory measurements, Brian Williams and Steve “Hutch” Hutchinson for assisting with field sampling. Portions of this material were supported by the US Geological Survey Climate and Land Use Change Research and Development Program and by NIFA/USDA, under project numbers SC-1700409, SC-1700424, and SC-1700393. Technical Contribution no. 6028 of the Clemson University Experiment Station.
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Chow, A.T., Dai, J., Conner, W.H. et al. Dissolved organic matter and nutrient dynamics of a coastal freshwater forested wetland in Winyah Bay, South Carolina. Biogeochemistry 112, 571–587 (2013). https://doi.org/10.1007/s10533-012-9750-z
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DOI: https://doi.org/10.1007/s10533-012-9750-z