碩士 / 國立中興大學 / 植物學系 / 89 / Periphyton are all organisms growing on solid substrata and have important contributions in primary production in shallow coastal ecosystems. This study was conducted in Tapong Bay, a tropical lagoon in southwestern Taiwan. The purposes of this study are 1. to compare different methods, including O2 evolution, 14C, and harvest method, which were used to determine productivity of periphyton and 2. to detect the spatial and seasonal pattern of the productivity.
In the comparisons of different methods, primary productivity determined by O2 evolution increased with 14C productivity and showed highly positive correlation. However, harvest method was negatively correlated with the productivity of O2 evolution. This is possibly due to the extent of competition within periphyton for light and nutrients increased when the accumulation biomass increased.
Periphyton showed clear seasonal and spatial pattern of gross community primary productivity (GCPP), but there was a significant interaction between season and site. The highest GCPP reached 453 ±45 mmoleO2.m-2.day-1 in spring in the inner lagoon. The lowest productivity was only 3.2 ±0.2 mmoleO2.m-2.day-1 and occurred in summer in the inner lagoon. Nested ANOVA test showed the variance of GCPP mainly occurred among sites rather than within periphyton. Diatoms increased with the GCPP. There is a significant positive relation between the dissolved inorganic nitrogen (DIN) in the water column and GCPP of periphyton. It suggests that periphyton might be nitrogen limited in the lagoon.
O2 evolution is obviously a better method to determine in situ primary productivity of periphyton. It is safer and cheaper than 14C method. In comparisons of productivity with other coastal ecosystems in Taiwan, the productivity in coastal lagoons is the highest. According to the criteria of trophic status for an aquatic ecosysytem determined by the supply of organic carbon proposed by Nixon, Tapong bay can be assigned an eutrophic costal lagoon.
| Identifer | oai:union.ndltd.org:TW/089NCHU0366007 |
| Date | January 2001 |
| Creators | WANG, TENG-CHUNG, 王騰崇 |
| Contributors | LIN, HSING-JUH, 林幸助 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 119 |
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