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標題: | 翡翠水庫浮游植物與異營浮游細菌的拮抗現象 The antagonism of phytoplankton vs. heterotrophic bacterioplankton in the Fei-Tsui Reservoir |
作者: | Ting-Chang Hsu 許庭彰 |
指導教授: | 夏復國 |
共同指導教授: | 戴昌鳳 |
關鍵字: | 初級生產力,細菌生產力,水庫,磷限制,磷酸鹽, primary production,bacteria production,reservoir,phosphorus limitation, |
出版年 : | 2005 |
學位: | 碩士 |
摘要: | 本研究於於2004年5月至次年4月間翡翠水庫大壩站進行雙週採樣,研究初級生產力(IPP,2-586 mgC m-2 d-1)、細菌生產力10 m積分平均值(IBP10m,5.6-57 mgC m-3 d-1)及相關物理、生物化學參數的季節性變化及相互關係。翡翠水庫浮游植物IPP在春季與夏季出現兩個超過500 mgC m-2 d-1的峰值,年平均值為243 ± 165 mgC m-2 d-1。本調查觀察到三個主要的現象:(一)、在春季時,水中磷酸鹽(PO4-3)濃度因冬天表水冷卻的混合作用而升高。在此季節細菌由於低水溫的抑制,無法與浮游植物競爭PO4-3,故而春季會有高IPP但低IBP10m的現象。(二)、颱風暖季時帶入額外的PO4-3進入水體,使得IBP10m提高,但IPP及溶解態有機碳(DOC)濃度卻一路下滑。這可能是因為細菌在高水溫及高PO4-3競爭能力的條件下,將PO4-3吸收殆盡,造成不利浮游植物生長環境所致;此外細菌在利用PO4-3的同時,也逐步的消耗水中的DOC。(三)、在非颱風暖季時段,IBP10m降低,IPP升高,兩者呈現負相關。在此季節浮游植物的優勢種類可能為大小與細菌相當的藍綠藻,加上植浮對磷的需求較細菌低及高光照的有利條件下,取得了與細菌競爭PO4-3的優勢。同時期所觀察到DOC的累積,似乎可以用浮游植物高泌溢速率(高DOC源)、高浮游動物攝食作用及植浮本身凋萎作用(高DOC源)與低細菌生產力(低DOC消耗)合理的加以解釋。本研究是少數(可能是唯一)發現植浮與細菌間拮抗現象的第一手野外證據,此一現象與浮游植物群聚結構季節變化的關連性,以及對phytoplankton–bacteria paradox的解釋將詳細討論。 Temperature, nutrients, primary production and bacteria production were sampling bi-weekly from May 2004 to April 2005 in dam station of Fei-Tsui Reservoir. Three main phenomena were observed in this study. First, primary production increased while sufficient light intensity and phosphorus concentration of surface water in spring. The uptake ability of phosphorus by bacteria was inhibited due to low water temperature, and caused bacterial production low in spring. Second, bacteria production was stimulated with higher temperature and extra phosphorus but primary production was not in typhoon season, caused the decrease of DOC concentration in surface water. Finally, cynobacteria, which dominated in dam, became a superior phosphorus competitor because of size closes to bacteria and its lower phosphorus demand, DOC is accumulated by primary production increased and bacteria production decreased in non-typhoon season. The antagonism of phytoplankton vs. heterotrophic bacteria in other studies may be the first observation in field study. Results suggest the seasonal succession of phytoplankton, which might play a key role in explain the antagonism phenomena and the phytoplankton-bacteria paradox should be study in future. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/35355 |
全文授權: | 有償授權 |
顯示於系所單位: | 海洋研究所 |
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