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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.40, no.1, 2007³â, pp.121-129
ºÎ¿µ¾ç Àú¼öÁö¿¡¼­ ³²Á¶·ùÀÇ ¹ß´Þ°ú õÀÌ ¹× ¿µÇâ ¿äÀÎ
( Cyanobacterial Development and Succession and Affecting Factors in a Eutrophic Reservoir )
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º» ¿¬±¸´Â ºÎ¿µ¾ç Àú¼öÁö¿¡¼­ ³²Á¶·ùÀÇ ¹ß´Þ°ú õÀÌ¿¡ ¿µÇâÀ» ¹ÌÄ¡´Â ¿äÀεé°ú ±× °á°ú¸¦ Æò°¡Çϱâ À§ÇÏ¿©, 2003³â 3¿ùºÎÅÍ 2004³â 2¿ù±îÁö ÇöÀå Á¶»ç¸¦ ÅëÇÏ¿© ³²Á¶·ù Á¾Á¶¼º°ú ¹Ðµµº¯È­, ħÀüƯ¼º, ÅðÀû¹° Ư¼ºÀ» ºÐ¼®ÇÏ¿´´Ù. ¶ÇÇÑ ÀÎ, ¼ö¿Â, ±¤µµ¸¦ ´Þ¸®ÇÑ Á¶°Ç¿¡¼­ÀÇ ³²Á¶·ù ¼ºÀå·üÀ» ºñ±³ÇÏ¿´´Ù. ½Ä¹°ÇöûũſÀº º½Ã¶(3${sim}$4¿ù)¿¡ ±ÔÁ¶·ù¿Í Æí¸ðÁ¶·ù°¡ ¿ìÁ¡ÇÑ ½Ã±â¸¦ Á¦¿ÜÇϰí´Â ¿¬Áß ³²Á¶·ù°¡ ¿ìÁ¡ÇÏ¿´°í, 7¿ù°ú 11¿ù¿¡ ³ôÀº ¹Ðµµ Áõ°¡°¡ °üÂûµÇ¾ú´Ù. ³²Á¶·ù ¿ìÁ¡±â°£ Áß 5¿ù¿¡´Â Oscillatoria spp., 6¿ù¿¡´Â Aphanizomenon sp.ÀÌ ¿ìÁ¡ÇÏ¿´°í, 7¿ùºÎÅÍ 11¿ù±îÁö´Â Microcystis spp.°¡ ¿ìÁ¡Á¾À¸·Î ³ªÅ¸³µ´Ù. Oscillatoria spp.°¡ ¿ìÁ¡Çϰí ħ°­À²ÀÌ ³ô¾Ò´ø 5¿ù¿¡´Â ¼ö¿Â, ±¤µµ ±×¸®°í TN/TPºñ°¡ ³ô¾Ò´ø ¹Ý¸é, Microcystis spp.°¡ ¿ìÁ¡ÇÑ 7¿ùºÎÅÍ 11¿ù±îÁöÀÇ TN/TPºñ´Â »ó´ëÀûÀ¸·Î ³·Àº ¹üÀ§ (Æò±Õ 27)¸¦ º¸¿´´Ù. ħ°­¼Óµµ´Â ±ÔÁ¶·ù°¡ ¿ìÁ¡ÇÑ 3¿ù °¡Àå ³ô¾Ò°í, ³²Á¶·ùÀÇ ¿ìÁ¡Á¾ ±â°£ Áß¿¡¼­´Â 5¿ù°ú 10¿ùÀÌ ´Ù¸¥ ½Ã±â¿Í ºñ±³ÇÒ ¶§ »¡¶ú´Ù. ÅðÀû¹°ÀÇ C/Nºñ´Â $6{sim}8$ÀÇ ¹üÀ§¿´°í, °£±Ø¼ö³» ¹«±âÀÎÀÇ ³óµµ´Â ½ÉÃþ¿¡ »ê¼Ò³óµµ°¡ Èñ¹Ú(<2mg $O_2$ $L^{-1}$)ÇÏ¿´´ø ½Ã±â¿¡ °¨¼ÒÇÏ¿´´Ù. ³²Á¶·ùÀÇ ¼ºÀå·üÀº ¿µ¾ç¿° ³óµµ¿Í ¼ö¿Â¿¡ Å©°Ô ÀÇÁ¸ÇÏ¿´°í, ƯÈ÷ ³ôÀº ÀÎ ³óµµ´Â ³·Àº ¼ö¿Â¿¡¼­µµ ³²Á¶·ù°¡ ¹ß´ÞÇÏ´Â ¿øÀÎÀ¸·Î ³ªÅ¸³µ´Ù. º» ¿¬±¸ÀÇ °á°ú´Â, ÀÎÀÌ ÃæºÐÇÏ°Ô °ø±ÞµÇ´Â ±¹³»ÀÇ ¸¹Àº ¼ÒÇü ºÎ¿µ¾ç Àú¼öÁö¿¡¼­ ¿¬Áß ³²Á¶·ùÀÇ ¹ß´Þ°ú Áö¼Ó°¡´É¼ºÀ» ½Ã»çÇϸç, ¼öÁú°³¼±°ú Á¶·ùÁ¦¾î¸¦ À§ÇØ ÀÎÀÇ Àú°¨(ƯÈ÷, ÅðÀûÃþ °ü¸®)À» ¸Å¿ì Áß¿äÇÏ°Ô °í·ÁÇØ¾ß ÇÔÀ» °­Á¶ÇÑ´Ù.in Fig. 3 and 4. These three dimensional data of sculling motion and generated real time force components are the unique experimental information which could clarify the thrust force generating mechanism of sculling motion. The experimental results have been reanalyzed by focusing the relation between instantaneous attack angle of blade section and the resultants real time force components. Through these investigation it is found out that the conventional imagination that the 7cull motion should be effective in generating lift force must be reconsidered because the attack angle of scull blade are too great to free from stall phenomena during the sculling operation.Àá119>Àá113>Àá120ÀÇ ¼øÀ̾ú´Ù.Áö¹æ»êÀÇ Á¶¼ºÀÌ ¸¹Àº Â÷À̸¦ º¸¿´´Ù.{2+}$ 26 ¹× $Na^+$ 26 mg $L^{-1}$À̾ú´Ù. ¾ç¾× Àç¹è ÈÄ ¹ö·ÁÁö´Â Æó¾ç¾× ÁßÀÇ ¹«±â¼ººÐ ÇÔ·®Àº ¾ç¾×Àç¹è¿¡ ÀÌ¿ëµÇ´Â ¿ø¼ö¿¡ ºñÇØ »ó´çÈ÷ ³ô¾ÆÁ³´Ù.·á·Î¼­ ÀÀ¿ë °¡´É¼ºÀÌ ÀÖÀ½À» ½Ã»çÇÑ´Ù.¾àÀç·áÀÎ ¾àÃÊ·ù µîÀ» ÀÌ¿ëÇÏ¿´´Âµ¥ ¿À·§µ¿¾È Ç« »î¾Æ ±×¹°¿¡ °î·ù µîÀ» ³Ö¾î Á×À̳ª ¹äÀ¸·Î Á¶¸®ÇÏ¿´
This study was conducted to evaluate the causes and effects of cyanobacterial development and succession in a shallow eutrophic reservoir from March 2003 to February 2004. Phytoplankton succession, sedimentation rate, and sediment composition were analyzed. Algal bioassay also was conducted with the consideration of light, water temperature and nutrients. Cyanobacteria dominated throughout the year, except for spring season (March${sim}$April) in which diatoms and flagellates dominated. Total cell density increased in July and November when P loading through inflows was high. Oscillatoria spp. and Aphanizomenon sp. were dominant in May and June, respectively, but replaced with Microcystis spp. in July. Thereafter, Microcystis spp. sustained until December, and again shifted to Oscillatoria spp. and Aphanizomenon sp. The dominance of Oscillatoria spp. in May was accompanied with high TN/TP ratio and the increase of water temperature and light intensity. While the dominance of Microcystis spp. was related with relatively low TN/TP ratio, ranging from 46 to 13 (average: 27). The sedimentation rate was highest in March (0.6 m $day^{-1}$) when diatoms dominated. During the period of cyanobacterial dominance, relatively high sedimentation rate was observed in May (0.4 m $day^{-1}$) and October (0.36m $day^{-1}$). C/N ratio of the sediment ranged $6{sim}8$. Inorganic P concentration in the pore water was low when DO concentration was < 2 mg $O_2$ $L^{-1}$ in the hypolimnion, reflecting the P release from the sediment. Cyanobacterial growth rate depended on phosphorus concentration and water temperature, and high P concentration compensated for the low temperature in the growth rate. Our results suggest that the potential of cyanobacterial development and substantiality in eutrophic reservoirs be high throughout the year, as being supplied with enough P, and emphasize the consideration of sediment man. agement for the water quality improvement and algal bloom control.
 
Ű¿öµå
Cyanobacteria;eutrophic reservoir;TN/TP ratio;phosphorus;sediment management;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.40, no.1, 2007³â, pp.121-129
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200709905949292)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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