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研究生:王騰崇
研究生(外文):WANG, TENG-CHUNG
論文名稱:大鵬灣竹片上附生藻類生產力之時空變化
論文名稱(外文):Metabolism of periphyton colonizing bamco substrate in Tapong Bay
指導教授:林幸助林幸助引用關係
指導教授(外文):LIN, HSING-JUH
學位類別:碩士
校院名稱:國立中興大學
系所名稱:植物學系
學門:生命科學學門
學類:生物學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:119
中文關鍵詞:總群聚初級生產力碳十四法溶氧法收割法
外文關鍵詞:gross community primary productivity14CO2 evolutionharvest
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附生藻類是著生於固態基質上一切生物的集合群體,附生藻類在淺水域生態系中因高生產力有著重要的貢獻與角色。本研究主要目的是要了解溶氧法、碳十四法與收割法等方法測定附生藻類生產力時的差異,並了解台灣西南方優養化的熱帶性海岸潟湖─大鵬灣中附生藻類初級生產力的時空變化。
結果顯示不同的生產力測定方法間,收割法生產力的時空變化趨勢與溶氧法有負相關性。生物量越多,收割法生產力越大,但是附生藻類量增加時可能會增加群聚內對光線和營養鹽競爭的效應,因而造成溶氧法所測定之生產力隨生物量增加而下降。溶氧法則與碳十四法呈現高度的正相關。
附生藻類總初級生產力(GCPP: Gross Community Primary Productivity)有明顯的時空變化,但時空變化間呈現顯著的交互作用,亦即各測站之季節性變化有所不同。GCPP的季節性變化最高值發生在春季之潟湖內部,約為453 ±45 mmoleO2.m-2.day-1,最低值亦發生於夏天之潟湖內部,約為3.2 ±0.2 mmoleO2.m-2.day-1。同時間下大鵬灣之GCPP於內部與外部地點間之最大差異發生於春天,最外部與最內部GCPP相差約30倍左右。GCPP的時空變化與底棲微藻在附生藻類生物量中所佔比例和水體中的無機氮濃度(DIN)有非常顯著的正相關性,初步推測大鵬灣的GCPP可能是受到水體中氮的限制(nitrogen limitation)而有GCPP之時空變化。
綜合看來,溶氧法是較好的方法,因其可短時間內野外於直接測得附生藻類的生產力的變化,又有低危險性與低成本的優點。而大鵬灣的生產力與台灣其他沿海生態系的比較下,有著較高的生產力。若藉由Nixon所提出由整個生態系有機碳的輸入量評估優養化的程度,可以得知大鵬灣為一個優養化的潟湖。
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.
目次
壹.前言……………………………………………………………… 1
貳.前人研究與原理
2.1 附生藻類之定義……………………………………………. 3
2.2 附生藻類之生產力與群聚代謝……………………………. 5
2.3 附生藻類生產力測定之方法
2.3.1 收割法…………………………………………………. 7
2.3.2 溶氧法與碳十四法……………………………………. 8
2.4 初級生產力與環境間的關係
2.4.1 附生藻類生產力與營養鹽間的關係…………………..12
2.4.2 影響生產力的其他因子………………………………..13
參.材料與方法
3.1 研究地點與時間
3.1.1研究地點之位置………………………………………….16
3.1.2研究進行之時間…………………………………………..20
3.2 生產力測定之方法
3.2.1生物固著板………………………………………………..20
3.2.2收割法……………………………………………………..21
3.2.3溶氧法……………………………………………………..22
3.3 附生藻與浮游藻葉綠素a之測定…………………………….39
3.4 環境因子之測定……………………………………………….41
3.5 附生藻類中初級生產者之鑑定與比例之估算
3.5.1 初級生產者種類之鑑定…………………………………..42
3.5.2 藻類群聚組成……………………………………………..43
3.6 以碳十四法測定生產力………………………………………..45
肆.結果
4.1 環境因子測定之結果…………………………………………..50
4.2 浮游藻群聚葉綠素a濃度與生產力…………………………...52
4.3 附生藻類葉綠素濃度與收產力測定之結果
4.3.1附生生物葉綠素a濃度…………………………………….54
4.3.2 收割法所獲得生產力……………………………………..58
4.3.3 溶氧法所獲得生產力……………………………………..62
4.3.4溶氧法與碳十四法同時測量生產力之結果……………...66
4.4 不同方法所測得之生產力的比較……………………………..70
4.5 大鵬灣生產力季節性變化與環境因子間之相關性…………..72
4.6 底棲微藻與大型藻再附生藻類中的種類組成………………..76
4.7 附生藻與浮游藻對重要性……………………...……………...81
伍.討論
5.1 附生藻溶氧法生產力與收割法生產力之結果………………..85
5.2 溶氧法與碳十四法之結果……………………………………..87
5.3 影響附生藻類生產力變化的水質因子………………………..89
5.4 附生藻類生產力與附生藻葉綠素a和底棲性微藻…………..94
5.5 大鵬灣蚵架上附生藻與浮游藻在大鵬灣中之
生產力貢獻……………………………….……………………95
5.6大鵬灣浮游藻類生產力與台灣其他地點之比較………………96
5.7 大鵬灣附生生物群聚生產力與其他地點之比較……………..97
5.8 大鵬灣生態系年生產力與優養化……………………………100
陸.結論..……………………………………………………………...102
柒.參考文獻.………………………………………………………...104
捌.碩士論文口試會議記錄………………………………..……112..
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