碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 95 / We analyzed the seasonal variation of primary production and the phytoplankton biomass in the Danshuei River estuary and adjacent coastal area during the period of September 2003 to October 2006. In the estuary coastal area, phosphate and temperature are both limiting factor of phytoplankton variation. A two-phased (warm＞25℃；cold＜25℃) seasonal cycle was found in primary production and phytoplankton biomass. In the warm season, the water column showed stratification, low phosphate concentration, high primary production and chlorophyll a. On the other hand, an opposite phenomenon was observed in the cold season. Primary production and chlorophyll a were highly related with temperatures, but diatom abundance was ranged between 0.2 × 107 and 8.3 × 108 cells m-3, which showed an exponential relationship with temperature. Therefore we suggest that the diatom is not a main contributer to the seasonal variation of primary production and chlorophyll a.
The diatom bloom in warm season was resulted from the high concentration of nutrient (phosphate) and the euphotic depth. During the first phase of the discharge of river water, the water column was very turbid and the euphotic depth was shallow, therefore both primary production and diatom abundance wwew rather low, and light was the limiting factor. The light condition was improved gradually after the euphotic zone was increased, in the meanwhile primary production of phytoplankton and diatom abundance were increased to peak value and diatom bloom occurred. When nutrient was exhausted, the diatom bloom ended, and diatom community returned to a Background Assemblage.
Keywords：Diatom、diatom bloom、phytoplankton、estuary and
adjacent coastal area.
| Identifer | oai:union.ndltd.org:TW/095NTOU5451020 |
| Date | January 2007 |
| Creators | Chien-Tung Chen, 陳見東 |
| Contributors | Kuo-Ping Chiang, 蔣國平 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 34 |
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