Flux of organic carbon in a riverine mangrove wetland in the Florida Coastal Everglades
Flux of organic carbon in a riverine mangrove wetland in the Florida Coastal Everglades
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DOI：
10.1007/s10750-006-0152-x
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发表时间：
2006-10-01
期刊：
影响因子：
2.6
通讯作者：
Twilley, Robert R.
中科院分区：
文献类型：
--
作者：
Romigh, Melissa M.;Davis, Stephen E., III;Twilley, Robert R.
2003年对美国佛罗里达州Shark River沿着红树林湿地15个潮汐周期中溶解有机碳（DOC）浓度和通量的短期（日）和季节变化进行了研究。由于季节性降雨和风模式对Shark River水文的影响，采样包括湿、干和过渡（Norte）季节。我们使用的水槽从潮沟延伸到一个盆地森林测量垂直（植被土壤/水柱）和水平（红树林/潮沟）的DOC通量。表层水温、盐度、电导率、pH值和DOC平均浓度随季节变化显著（p < 0.05）。水温和盐度遵循季节性模式的空气温度和降雨量，而平均DOC浓度最高的旱季（5月），其次是湿（10月）和“北”（12月）的季节。这种模式的DOC浓度可能是由于结合凋落物的生产和淹没模式的湿地。与潮间红树林和潮沟DOC通量的日变化相比，潮间平均水质的日变化不显著。DOC通量、溶解氧含量和盐度随潮内变化规律明显。这表明，淹没的长度和水资源（淡水与盐水）的变化在整个潮汐周期影响水质和DOC通量的水柱。10月和12月的DOC净输出，表明红树林在这些时期是DOC的来源，邻近的潮沟。边缘红树林向潮沟和流域红树林的DOC年净输出量为56 g C m（-2）a（-1）。我们的通量的季节模式的结果表明，DOC通量从这个红树林可能是由淡水流量和潮差。
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.