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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.37, no.1, 2004³â, pp.36-46
ºÎ¿µ¾ç Àú¼öÁö¿¡¼­ ½Ä¹°Çöûũſ ¼ºÀå¿¡ ´ëÇÑ Á¦ÇÑ¿µ¾ç¿°°ú Áú¼Ò/ÀÎ ºñÀÇ ¿µÇâ
( Effects of Nutrients and N/P Ratio Stoichiometry on Phytoplankton Growth in an Eutrophic Reservoir )
±èÈ£¼·;Ȳ¼øÁø; °Ç±¹´ëÇб³ Áö¿ª°Ç¼³È¯°æ°øÇаú;°Ç±¹´ëÇб³ Áö¿ª°Ç¼³È¯°æ°øÇаú;
 
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¼Ò±Ô¸ð ºÎ¿µ¾ç Àú¼öÁö¿¡¼­ ½Ä¹°Çöûũſ ¼ºÀå¿¡ ´ëÇÑ Á¦ÇÑ¿µ¾ç¿°°ú N/P¹«°ÔºñÀÇ ¿µÇâÀ» Æò°¡Çϱâ À§ÇØ 2002³â 11¿ùºÎÅÍ 2003³â 12¿ù±îÁö ÀÌ·ç¾îÁ³´Ù. Á¶»ç±â°£ µ¿¾È ¼öü ³» DIN/DTP°ú TN/TP ¹«°Ôºñ´Â °¢°¢ 17${sim}$187,33${sim}$60ÀÇ ¹üÀ§·Î ³ªÅ¸³µ´Ù. ¿ëÁ¸¹«±âÁú¼ÒÀÇ ´ëºÎºÐÀº Áú»ê¼º Áú¼Ò($NO_3$-N)ÇüÅ·ΠÁ¸ÀçÇßÀ¸¸ç, º½¿¡ ÀϽÃÀûÀÎ ¾Ï¸ð´Ï¾Æ ³óµµÀÇ Áõ°¡°¡ ³ªÅ¸³µ´Ù. ¹Ý¸é¿¡ ¹«±âÀÎÀº 8.8${sim}$0.6 ${mu}g;P;L^{-1}$ÀÇ ¹üÀ§·Î °èÀý¿¡ µû¸¥ º¯È­´Â Àû¾úÀ¸¸ç, ¿ëÁ¸ÃÑÀÎÀº 26.5 ${sim}$ 10.1 ${mu}g;P;L^{-1}$·Î 8¿ù¿¡ °¡Àå ³ô¾Ò°í 12¿ù¿¡ °¡Àå ³·Àº ³óµµ¸¦ ³ªÅ¸³Â´Ù. ¿±·Ï¼Ò a ³óµµ´Â 28.8${sim}$109.7 ${mu}g;L^{-1}$ÀÇ ¹üÀ§¿´°í, ½Ä¹°Çöûũſ ¼¼Æ÷¹Ðµµ º¯È­¿Í À¯»çÇÑ °èÀýÀûÀÎ º¯È­¸¦ º¸¿´´Ù. º½¿¡´Â ÁÖ·Î ±ÔÁ¶·ù(Melosira varians)¿Í ³ìÁ¶·ù (Dictyosphaerium puchellum)°¡ ¿ìÁ¡Á¾À¸·Î ³ªÅ¸³­ ¹Ý¸é 5¿ùºÎÅÍ °áºù Àü±îÁö´Â Osillatoria SPP., Microcystis SPP., Aphanizomenon SP. ¿Í °°Àº ³²Á¶·ù°¡ ¿ìÁ¡ÇÏ¿´´Ù. ³²Á¶·ù ±ºÁý Áß Microcystis SPP.°¡ ¿ìÁ¡ÇÑ 6¿ùºÎÅÍ 12¿ù±îÁö ¼öü ³» TN/TPºñ´Â 46${sim}$13ÀÇ ¹üÀ§ (Æò±Õ 27${pm}$5)¿´´Ù. ¿µ¾ç¿° ÷°¡½ÇÇèÀǸðµç °æ¿ì(17¹ø)¿¡¼­ Àο¡ ÀÇÇÑ Á¦ÇÑÀÌ ³ªÅ¸³µÀ¸¸ç, Áú¼ÒÁ¦ÇÑÀº 8¹ø¿¡ °ÉÃÄ ³ªÅ¸³µ´Ù. ½Ä¹°Çöûũſ ¼ºÀå·üÀºDIN/DTPºñ 30ÀÌÇÏ¿¡¼­ °¡Àå Å©°Ô ³ªÅ¸³µ°í, ÀÎ ³óµµ50 ${mu}g;P;L^{-1}$±îÁö´Â Áö¼ÓÀûÀ¸·Î Áõ°¡ÇÏ¿´´Ù. Àý´ë ³óµµ¿¡ À־ Â÷À̰¡ ÀÖÀ¸³ª, N/Pºñ°¡ µ¿ÀÏÇÑ »óÅ¿¡¼­ÀÇ ³²Á¶·ù ¼ºÀåÀº Áú¼Ò ³óµµ°¡ 3.5 mg N $L^{-1}$ÀÎ °æ¿ì N/P ºñ°¡ 1ÀÎ »óÅ¿¡¼­ ¼ºÀå·®ÀÌ °¡Àå ÄÇ´Ù. ÀΠ÷°¡¿¡ µû¸¥ ¼ºÀåÀº Áú¼Ò³óµµ°¡ ³ôÀ»¼ö·Ï ÇöÀúÈ÷ ³ô°Ô ³ªÅ¸³µ´Ù. ÀÌ·¯ÇÑ °á°úµéÀº ¼öü ³» Áú¼Ò³óµµ°¡ ³ôÀº ȯ°æ¿¡¼­´Â ½Ä¹°Çöûũſ¼ºÀå¿¡ ´ëÇÑ °­ÇÑ ÀÎ Á¦ÇÑÀÌ ³ªÅ¸³ª±â ½¬¿î ¹Ý¸é, Áú¼ÒÁ¦ÇÑ °¡´É¼º ÀÌ »ó´ëÀûÀ¸·Î ÀûÀ½À» ÀǹÌÇÑ´Ù.
We evaluated the effect of limiting nutrients and N/P ratio on the growth of phytoplankton in a small eutrophic reservoir from November 2002 to December 2003. Nutrient limitation was investigated seasonally using nutrient enrichment bioassay (NEB). DIN/DTP and TN/TP ratio (by weight) of the reservoir during the study period ranged 17${sim}$187 and 13${sim}$60, respectively. Most of nitrogen in the reservoir account for $NO_3$-N, but sharp increase of ammonia was evident during the spring season. Seasonal variation of dissolved inorganic phosphorus concentration was relatively small. DTP ranged 26.5${sim}$10.1 ${mu}g;P;L^{-1}$, and the highest and lowest concentration was observed in August and December, respectively. Chlorophyll a concentration ranged 28.8${sim}$109.7 ${mu}g;L^{-1}$, and its temporal variation was similar to that of cell density of phytoplankton. Dominant phytoplankton species were Bacillariphyceae (Melosira varians) and Chlorophyceae (Dictyosphaerium puchellum) in Spring (March${sim}$April). Cyanophyceae, such as Osillatoria spp., Microcystis spp., Aphanizomenon sp. dominated from May to the freezing time. TN/TP ratio ranged from 46 to 13 (Avg. 27${pm}$6) from June to December when cyanobacteria (Microcystis spp.) dominated. p limitation for algal growth measured in all NEB experiments (17cases), while N limitation occurred in 8 out of 17 cases. The growth rates of phytoplankton slightly increased with decreasing of DIN/DTP ratio. Evident increase was observed in the N/P ratio of > 30, and it was sustained with DTP increase until 50 ${mu}g;P;L^{-1}$. Under the same N/P mass ratio with the different N concentrations (0.07, 0.7and 3.5 mg N $L^{-1}$), Microcystis spp. showed the highest growth rate in the N/P ratio of< 1 with nitrogen concentration of 3.5 mg N $L^{-1}$). The responses of phytoplankton growth to phosphate addition were clearly greater with increase of N concentration. These results indicate that the higher nitrogen concentration in the water likely induce the stronger P-limitation on the phytoplankton growth, while nitrogen deficiency is not likely the case of nutrient limitation.
 
Ű¿öµå
Eutrophic reservoir;N/P ratio(by weight);P-limitation;Algal growth;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.37, no.1, 2004³â, pp.36-46
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200418317182392)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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