碩士 / 國立臺灣師範大學 / 生命科學研究所 / 102 / This study was designed to explore spatio-temporal variations of plankton community respiration (CR) and organic carbon cycle in Dongsha Atoll. Four curises were performed in different seasons. Results showed that the ragne of CR in spring (May), summer (July), autumn (September), and winter (February) were 41.1~279.2, 9.0~116.0, 41.9~113.9 and 0.0~69.8 mg C m-3 d-1, respectively. The lowest rate was observed in winter. Further analyses suggest that the CR was mostly related to biomass and production of plankton communities, especially phytoplankton and bacterioplankton. This assumption can be verified by significant relationships between mean values (per m3) over water depth of CR vs. chlorophyll a (Chl a), heterotrophic bacterial biomass (BB) or production (BP; all p<0.05). Seasonally, the rate of CR might mostly attribute to phytoplankton, particularly diatom, in spring. This assumption could be validated by significant regressions between CR and Chl a or silicate. In summer, the CR was not related to any observed variables. Even though the estimated bacterial respiration accounting for 24.2% of CR, it can not explain the variation of CR rate. In autumn, CR was significantly related to BB (p<0.05), and it suggests that the CR was dominated by bacterioplankton. As state above, the lowest CR was observed in winter, and it might be due to low plankton biomass. Moreover, the mean ratio of primary production to community respiration was close to or higher than 1, and it indicates that the ecosystem of Dongsha Atoll was either carbon balance or autotrophic. It also suggests that there was residual organic carbon deposited to the bottom of Dongsha Atoll or exported to nearby ecosystems.
| Identifer | oai:union.ndltd.org:TW/102NTNU5112015 |
| Date | January 2014 |
| Creators | Che-Chi Chang, 張哲誌 |
| Contributors | Chung-Chi Chen, 陳仲吉 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
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