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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.37, no.1, 2004³â, pp.57-63
¼­³«µ¿°­¿¡¼­ ½Ä¹°ÇöûũſÀÇ 1Â÷ »ý»ê¼º
( Primary Productivity of Phytoplankton in the Shallow and Hypertrophic River (Seonakdong River) )
Àü½ÂÀÏ;Á¶°æÁ¦; ÀÎÁ¦´ëÇб³ ³«µ¿°­È¯°æ¿¬±¸¼¾ÅÍ;ÀÎÁ¦´ëÇб³ ³«µ¿°­È¯°æ¿¬±¸¼¾ÅÍ;
 
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¼­³«µ¿°­¿¡¼­ $^{14}C$¹ýÀ¸·Î 1996³â 1¿ùºÎÅÍ 10¿ù±îÁö ½Ä¹°ÇöûũſÀÇ 1Â÷ »ý»ê¼ºÀ» ÃøÁ¤ÇÏ¿´´Ù. ¼­³«µ¿°­Àº ¼ö½ÉÀÌ ¾è°í, ±¹³» È£¼ö¿Í ÇÏõ Áß¿¡¼­ °¡Àå ¼öÁú¿À¿°ÀÌ ½ÉÇÑ °÷À¸·Î Áø±¤ÃþÀÇ ±íÀÌ´Â1.4${sim}$2.1 m ¹üÀ§¿´´Ù. ½Ä¹°ÇöûũſÀÇ chi-a ³óµµ´Â 67${sim}$894 ${mu}g;L^{-1}$ ¹üÀ§¿´°í, 8¿ù¿¡´Â chi-a ³óµµ°¡ Å©°Ô Áõ°¡ÇÏ¿´´Ù. ÃÖ´ë ¹°Áú»ý»ê¼ºÀº ¼öÇ¥¸é ${sim}$0.4 m ±íÀÌ¿¡¼­ ³ªÅ¸³µÀ¸¸ç 2.1${sim}$4.3 mg C mg $chl-a^{-1}$ ¹üÀ§¿´´Ù. ±¤ÇÕ¼º (P)-±¤(I)ÀÇ °ü°è¿¡¼­ ½Ä¹°ÇöûũſÀÇ ±¤ÇÕ¼º ÀúÇØ´Â ³ôÀº °í±¤¿¡¼­ ÇöÀúÈ÷ ÀúÇØµÇ¾úÀ¸³ª Microcystis°¡ ´ë¹ß»ýÇÑ ±â°£¿¡´Â ±¤ÀúÇØ Çö»óÀÌ ³ªÅ¸³ªÁö ¾Ê¾Ò´Ù. Chl-a ´ç ½Ä¹°ÇöûũſÀÇ 1Â÷ »ý»ê¼ºÀº ÀÔ»ç ±¤¿¡³ÊÁöÀÇ ¾ç¿¡ ºñ·ÊÇÏ¿´À¸¸ç ¸éÀû ´ç 1Â÷ »ý»ê¼ºÀº chl-aÇöÁ¸·®°ú Á÷¼±ÀûÀ¸·Î ºñ·ÊÇÏ¿© ½Ä¹°ÇöûũſÀÇ 1Â÷ »ý»ê¼ºÀº °á°úÀûÀ¸·Î »ý¹°·®°ú ±¤ÀÇ ÇÔ¼ö¿´´Ù. °ú°Å ÀڷḦ ¼öÁýÇÑ °á°ú. ³«µ¿°­ Çϱ¸ Áö¿ª¿¡¼­ ½Ä¹°ÇöûũſÀÇ »ý»ê¼ºÀº Çϱ¸µÏ °Ç¼³(1987³â) ÀÌÈÄ ÇØ°¡°¨¿¡ µû¶ó Á¡ÁøÀûÀ¸·Î Áõ°¡ÇÏ¿© ÀÌ Áö¿ªÀÇ ºÎ¿µ¾çÈ­ Çö»óÀ» ¹Ý¿µÇÏ¿´´Ù. ½Ä¹°ÇöûũſÀÇ ¿¬ »ý»ê¼º °³³ä¿¡¼­ Æò±Õ 10 ${mu}g;chl-a;L^{-1}$ÀÇ »ý¹°·® Áõ°¡´Â 30 mg C $m^{-2};day^{-1}ÀÇ ´ÜÀ§¸éÀû ´ç »ý»ê¼º Áõ°¡¸¦ °¡Á®¿Ô´Ù.
Primary productivity of phytoplankton was measured by $^{14}C$ method from January to October of 1996 in Seonakdong River. This river was a highly productive freshwater showing the euphotic depth of 1.4 m in August and 2.1 m in the remaining season. Chlorophyll-a concentrations of phytoplankton ranged from 67 ${mu}g;L^{-1}$ to 894 ${mu}g;L^{-1}$ and showed the great increase in August. Maximum specific productivity was 2.1 ${sim}$4.3 mg C mg $chl-a{-1};hr^{-1}$ and occurred above 0.4m depth. In photosynthesis-irradiance relation, photoinhibition or photosynthetic suppression of phytoplankton occurred clearly in the cold seasons, while phytoplankton (mainly Microcystis aeruginosa and its relatives) in August did not show any symptom of the photosynthetic inhibition against the high irradiance. The specific productivity of phytoplankton was eventually dependant upon incident irradiance to show the linear correlation with received irradiance infield, and the areal productivity of phytoplankton upon chlorophyll-a standing crops. In the downstream of the Nakdong River, phytoplankton productions have linearly increased since the estuarine barrage construction to reflect the gradual eutrophication in the estuarine area. Average chlorophyll-a increase of 10 ${mu}g;chl-a;L{-1}$ absolutely corresponded to the primary production acceleration of 30 mg C $m^{-2};day^{-1}$ on the annual basis.
 
Ű¿öµå
phytoplankton;primary productivity;eutrophication;photoinhibition;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.37, no.1, 2004³â, pp.57-63
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200418317182407)
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