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生态学报  2008 

Response of phytoplankton to nutrients addition in the upwelling regions of the Taiwan Strait
台湾海峡上升流区浮游植物对营养盐添加的响应

Keywords: Taiwan Strait,upwelling,nutrients addition,phytoplankton,bloom
台湾海峡
,上升流,营养盐添加,浮游植物,水华,台湾海峡,流区,浮游植物,氮磷营养盐,添加,响应,the,Taiwan,Strait,regions,upwelling,addition,nutrients,phytoplankton,因素,上升流,消耗,同化利用,死亡,优势藻种,条件,氨氮

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Abstract:

In situ incubation experiments of nutrients addition to surface water from the upwelling region in the Taiwan Strait were conducted to investigate nutrient limitation of this area and the main factors that caused the phytoplankton bloom in June, 2006. Variation of nutrients, Chl-a concentration and phytoplankton species density were analyzed. The results showed no clear limitation by silicon, however clear nitrogen and phosphate limitations were found, and nitrogen limitation was more serious than phosphate limitation. Diatoms, such as Asterionellopsis glacialis grew immediately to become the dominant species after nutrients were added. Different mechanisms were used to explain the assimilation of nitrogen and phosphate by these dominant diatoms. Nitrogen was taken up and assimillated immediately after it was added. Ammonium addition resulted in rapid growth and die-out of the dominant diatoms compared with that of nitrate addition. However, because of the phosphate pool inside phytoplankton, the added phosphate was taken up quickly and stored, then assimilated slowly. The results suggest that nitrogen supply was the main factor that caused the phytoplankton bloom in the Taiwan Strait during the upwelling in 2006.

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