碩士 / 國立臺灣海洋大學 / 海洋環境與生態研究所 / 107 / Marine primary production plays an important role in the ocean. It represents the capacity of phytoplankton photosynthesis, in which phytoplankton convert inorganic carbon into organic carbon. Then, we call the amount of fixed carbon primary production. Marine primary production is divided into two categories, particulate and dissolved primary production. Particulate primary production (PPP) is considered the carbon sequestered as phytoplankton biomass, while the dissolved primary production (DPP) represents mainly the phytoplankton released dissolved inorganic carbon (DOC). PPP is usually transferred to higher trophic levels through grazing, whereas DPP provides an important source of energy for the microbial loop. As the importance of DPP to the microbial loop, however, there are relatively few studies on the DPP research. This study investigated the primary production of both PPP and DPP in the coast of Keelung in the northeastern Taiwan from January 2018 to March 2019. The results improved our understanding for the organic carbon fluxes in the subtropical, coastal northwestern Pacific.
The results showed that the photosynthetic parameters, maximum photosynthesis efficiency (PBm) and initial slope (), of the PPP were higher than those of the DPP. The PBm and of the PPP ranged from 4.10 to 22.60 mgC (mgChl)-1 h-1 and from 0.0083 to 0.0541 mgC (mgChl)-1h-1 (μE m-2 s-1)-1, respectively. For the PBm and of the DPP ranged from 1.56 to 18.25 mgC (mgChl)-1 h-1 and from 0.0033 to 0.0198 mgC (mgChl)-1 h-1 (μEm-2s-1)-1, respectively. In seasonal variations, the PBm of PPP and DPP in spring (12.45 ± 6.57 and 5.37 ± 3.00 mgC (mgChl) -1 h-1), summer (11.79 ± 0.88 and 4.11 ± 1.72 mgC (mgChl) -1 h-1) and autumn (12.89 ± 6.45 and 6.28 ± 5.95 mgC (mgChl)-1 h-1) were higher than those in the winter (4.89 ± 1.12 and 2.37 ± 0.52 mgC (mgChl)-1 h-1). showed insignificant seasonal difference in neither PPP nor DPP. The daily PPP was generally higher than DPP. The daily PPP ranged from 8.10 to 122.79 mgC m-3 d-1, while the daily DPP ranged from 2.84 to 98.55 mgC m-3 d-1. In seasonality, daily PPP was higher in spring (38.96 ± 23.07 mgC m-3 d-1), summer (56.21 ± 26.92 mg C m-3 d-1) and autumn (66.18 ± 41.63 mg C m-3 d-1) than that in winter (10.50 ± 1.92) mgC m-3 d-1). The daily DPP in spring (16.19 ± 12.66 mgC m-3 d-1) was higher than that in winter (4.82 ± 2.32 mgC m-3 d-1). The percentage of extracellular release (PER; = DPP/TPP) ranged from 17% to 45%, showing no significant trend in seasonal variation. The factors which may affect the PER is worth for future research.
| Identifer | oai:union.ndltd.org:TW/107NTOU528A004 |
| Date | January 2019 |
| Creators | Lan, Yi-Xiang, 藍義庠 |
| Contributors | Chen, Tzong-Yueh, 藍義庠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 43 |
Page generated in 0.0133 seconds