碩士 / 國立臺灣大學 / 環境工程學研究所 / 93 / Water quality in reservoirs is an important issue of concern in terms of water supply nowadays. Eutrophication is a prevailing problem threating the water quality of reservoirs in Taiwan. The ability to forecast the tendency of phytoplankton growth must be established, then the actions to prevent eutrophication can be taken.
There is great number of phytoplankton species in nature water bodies, and many factors interactively affect their growth. How they affect the growth of phytoplankton was examined in this study. First, the relationships between phytoplankton growth and environmental factors must be identified. Feitsui Reservoir is a model water body uesd to study the relationships described above. Second, whether environment gradient is benefitial to biodiversity or not, sampling and modeling must be done in this study to determine. Sampling at different depth in Feitsui Reservoir was undertaken to know the spatial distribution characteristics of water quality, phytoplankton and zooplankton growth. A conceptual model including stratified system was established to mimic the reservoir water column, which showed gradients of environmental factors.
According to the statistic analysis, it was found that seasonal growth and decline of algae were related to physical environmental factors which change seasonally. The mobility of phytoplankton and the water column mixing condition are both instrumental in creating the environment of phytoplankton growth. The biodiversity index, Shannon-Wiener Index, was related to temperature gradient according to the results of statistic analyses. From the simulating results of total amount of algae, phosphorus supply was found an important factor for growth. The model of coexistence of three types of algae is able to simulate algal succession. Periodically water mixing is the driving force of algal succession and beneficial to algae coexistence.
| Identifer | oai:union.ndltd.org:TW/093NTU05515028 |
| Date | January 2005 |
| Creators | Yu-Ching Chien, 簡鈺晴 |
| Contributors | Wu, Shian-chee, 吳先琪 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 127 |
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