This study aims to understand the role of the Tapong Bay on carbon biogeochemical cycle in the coastal zone and the influence of terrigenous inputs on ecosystem functioning in the Tapong Bay. The Tapong Bay is a semi-enclosed lagoon, occupied largely by fish farming cages and oyster culture racks. There is only one tidal inlet for exchanging water between the Tapong Bay and Taiwan Strait, which results in a low water exchange rate and oxygen deficient condition in the bottom water of the inner bay. The annual mean of water exchange time is about 10.6 days that is much longer than that in the Chiku Lagoon (5.8 days). Experimental results show that biological activity and variations of hydrochemistry primarily control the distributions of carbon and nutrients. Excess of DIP likely occurred in the Tapong Bay. Seasonal variations of primary productivity are apparently controlled by temperature, solar radiation and turbidity. The regression slope between particulate organic carbon and nitrogen approaches the Redfield ratio, indicating that organic carbon is derived primarily from biological production. The stratification of water column in the Tapong Bay was observed throughout the year. Diffusion from sediment may thus contribute significantly to nutrient distributions in bottom water. Diffusion flux estimated from porewater to bottom water is about 7.6% of annual mean input for DIN and is about 1.0% for DIP. Calcification process was observed in the Tapong Bay indicating that the oyster culture would affect the carbon budget in the bay. The annual mean production rate of organic carbon estimated from the biogeochemical model is about 5.80 mole C m-2 yr-1, implying that the Tapong Bay is an autotrophic system. The net ecosystem production (NEP) derived from diel observation is about 6.29 mmole C m-2 d-1 that is closed to 6.65 mmole C m-2 d-1 estimated from the biogeochemical modeling. The annual nitrogen fixation exceeds the annual denitrification [(nfix-denit)¡×1.30 mole m-2 yr-1] in the Tapong Bay. Carbon biogeochemical fluxes and budgets differ significantly between the Tapong Bay and the Chiku Lagoon, which may be arisen from pronounced difference in terrigenous inputs and seawater exchange rates.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0711101-182403 |
| Date | 11 July 2001 |
| Creators | Pei-Ying, Hung |
| Contributors | H. J. Lin, K. P. Chiang, M. L. Msieh, J. J. Hung, James T. Liu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0711101-182403 |
| Rights | unrestricted, Copyright information available at source archive |
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