Nutrient dynamics in mangrove areas of the Red River Estuary in Vietnam

Willigen, P. de; Trí, Nguyễn Hoàng; Lien, T.V.; Smith, Stephen V.

doi:10.1016/s0272-7714(02)00331-1

Cited by 35 publications

(22 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was designed to isolate internal, nonconservative production or consumption of dissolved CNP from conservative exchanges for a spatially homogeneous layer, segment, or estuarine water body. Table 1 The approach assumes a steady state condition that balances the sum of physical inputs against the sum of physical outputs (Wosten et al, 2003;Swaney et al, 2011). In general, salinity (S) differences between the estuary and the downstream oceanic boundary are used to define net flows, residual exchange, and flushing time (T f ).…”

Section: Application Of the Loicz Approach To The Caloosahatchee And mentioning

confidence: 99%

Seasonal dissolved inorganic nitrogen and phosphorus budgets for two sub-tropical estuaries in south Florida, USA

et al. 2013

View full text Add to dashboard Cite

Abstract. Interactions among geomorphology, circulation, and biogeochemical cycling determine estuary responses to external nutrient loading. In order to better manage watershed nutrient inputs, the goal of this study was to develop seasonal dissolved inorganic nitrogen (DIN) and phosphorus (DIP) budgets for the two estuaries in south Florida, the Caloosahatchee River estuary (CRE) and the St. Lucie Estuary (SLE), from 2002 to 2008. The Land-Ocean Interactions in the Coastal Zone (LOICZ) approach was used to generate water, salt, and DIN and DIP budgets. Results suggested that internal DIN production increases with increased DIN loading to the CRE in the wet season. There were hydrodynamic effects as water column concentrations and ecosystem nutrient processing stabilized in both estuaries as flushing time increased to > 10 d. The CRE demonstrated heterotrophy (net ecosystem metabolism or NEM < 0.0) across all wet and dry season budgets. While the SLE was sensitive to DIN loading, system autotrophy (NEM > 0.0) increased significantly with external DIP loading. This included DIP consumption and a bloom of a cyanobacterium (Microcystis aeruginosa) following hurricane-induced discharge to the SLE in 2005. Additionally, while denitrification provided a microbiallymediated N loss pathway for the CRE, this potential was not evident for the SLE where N 2 fixation was favored. Disparities between total and inorganic loading ratios suggested that the role of dissolved organic nitrogen (DON) should be assessed for both estuaries. Nutrient budgets indicated that net internal production or consumption of DIN and DIP fluctuated with inter-and intra-annual variations in freshwater inflow, hydrodynamic flushing, and primary production. The results of this study should be included in watershed management plans in order to maintain favorable conditions of external loading relative to internal material cycling in both dry and wet seasons.

show abstract

Section: Application Of the Loicz Approach To The Caloosahatchee And mentioning

confidence: 99%

Seasonal dissolved inorganic nitrogen and phosphorus budgets for two sub-tropical estuaries in south Florida, USA

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Finally, N exchange calculated from indirect estimates ranged from zero exchange in Sungai Merbrok, Malaysia (Gong & Ong, 1990) to export of -112.98 gN m -2 year -1 in the Red River, Vietnam (Wösten et al, 2003) (Tables 3, 5). The rest of the estimates were between the range of 1 and 5 gN m -2 year -1 .…”

Section: Nutrient Exchange Measured Through Indirect Estimatesmentioning

confidence: 99%

Carbon and nutrient exchange of mangrove forests with the coastal ocean

2010

View full text Add to dashboard Cite

Mangrove forests exchange materials with the coastal ocean through tidal inundation. In this study, we aim to provide an overview of the published data of carbon (C) and nutrient exchange of mangrove forests with the coastal ocean at different spatial scales to assess whether the exchange is correlated with environmental parameters. We collected data on C (dissolved and particulate organic C; DOC and POC) and nutrient exchange (dissolved and particulate nitrogen, N and phosphorus, P) and examined the role of latitude, temperature, precipitation, geomorphological setting, hydrology, dominant mangrove species and forest area in explaining the variability of the exchange. We identified that there are a range of methodologies used to determine material exchange of mangroves with the coastal zone, each methodology providing data on the exchange at different spatial scales. This variability of approaches has limited our understanding of the role of mangroves in the coastal zone. Regardless, we found that mangrove forests export C and nutrients to the coastal zone in the form of litter and POC. We found that precipitation is a major factor influencing the export of C in the form of litter; sites with low annual precipitation and high mean annual temperatures export more C as litter than sites with high precipitation and low temperature. Furthermore, export of POC is higher in zones with low mean annual minimum temperature. Identification of broad-scale trends in DOC and dissolved nutrients was more difficult, as the analysis was limited by scarcity of suitable studies and high variability in experimental approaches. However, tidal amplitude and the concentration of nutrients in the floodwater appears to be important in determining nutrient exchange. The strongest conclusion from our analysis is that mangrove forests are in general sources of C and nutrients in the form of litter and POC and that they are most likely to be exporting C subsidies in dry regions.

show abstract

“…Due to its proximity between northern and southern Asia and its extensive tidal flats and mangrove forests, the BLE is of great regional importance as a major stopover for migratory birds and locally as essential habitat for fish and wildlife. The mangrove forests are dominated by trees of Sonneratia caseolaris, Bruguiera gymnorhiza, Kandelia candel, Aegiceras corniculatum, and Acanthus ilicifolius (Wösten et al 2003;Nhuan 2007;Van Santen et al 2007), which play an important role in the filtering of terrestrial-derived material and pollutants, and as a physical buffer against erosion and surge from major storm events. For example, an estimated 26,000 kg N/day and 3,100 kg P/day are sequestered into the estuarine mangrove ecosystems of the Red River (Wösten et al 2003).…”

Section: Study Areamentioning

confidence: 99%

The application of δ13C and C/N ratios as indicators of organic carbon sources and paleoenvironmental change of the mangrove ecosystem from Ba Lat Estuary, Red River, Vietnam

et al. 2011

View full text Add to dashboard Cite

In this study, two sediment cores (*70 cm) were collected from separate mangrove forests straddling the Ba Lat Estuary, Red River of northern Vietnam, to examine the origins of sedimentary organic carbon (SOC) and reconstruct the paleoenvironment. In addition, mangrove leaves and particulate organic matter were collected and measured for d 13 C to trace the origins of SOC. The cores were analyzed by high-resolution sections for d 13 C, TOC, C/N ratios, sediment grain size, water content, and porosity, with values of d 13 C, TOC, and C/N ratios ranging from -28.19 to -22.5%, 2.14-30.94 mg/g, and 10.29-18.32, respectively. The d 13 C and TOC relationship indicated that there were some small residual effects of diagenetic processes on TOC and d 13 C values in mangrove sediments. However, the shifts of d 13 C and C/N ratios from the bottom to the surface sediment of the cores explained the change in organic matter sources, with values of C/N [ 12 and d 13 C \ -25%, and C/N \ 12 and d 13 C [ -25% indicated terrestrial (e.g., mangrove litter) and marine phytoplankton sources, respectively. The covarying d 13 C, C/N ratios, and sediment grain sizes during the past 100 years in sediment cores showed that the paleoenvironment may be reconstructed into three environments (subtidal, tidal flat, and intertidal mangrove). General trends in d 13 C and C/N followed a gradual increase in the C/N ratio and a concomitant decrease in d 13 C from the subtidal, through to tidal flat, and to the intertidal mangrove. d 13 C and C/N ratios are therefore effective in measuring the continuum of environmental change in mangrove ecosystem.

show abstract

Nutrient dynamics in mangrove areas of the Red River Estuary in Vietnam

Cited by 35 publications

References 6 publications

Seasonal dissolved inorganic nitrogen and phosphorus budgets for two sub-tropical estuaries in south Florida, USA

Seasonal dissolved inorganic nitrogen and phosphorus budgets for two sub-tropical estuaries in south Florida, USA

Carbon and nutrient exchange of mangrove forests with the coastal ocean

The application of δ13C and C/N ratios as indicators of organic carbon sources and paleoenvironmental change of the mangrove ecosystem from Ba Lat Estuary, Red River, Vietnam

Contact Info

Product

Resources

About