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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.43, no.1, 2010³â, pp.136-141
´ëûȣ¿¡¼­ÀÇ ´Ü±â ¿µ¾ç¿° ÷°¡ ½ÇÇè ¹× Á¦ÇÑ ¿µ¾ç¿°·ù ºÐ¼®
( Short-Term Nutrient Enrichment Bioassays and Nutrient Limitation in Daechung Reservoir )
ÀÌ»óÀç;¾È±¤±¹; Ãæ³²´ëÇб³ »ý¸í°úÇаú;Ãæ³²´ëÇб³ »ý¸í°úÇаú;
 
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º» ¿¬±¸´Â ±¹³» ´ëÇ¥Àû ÀΰøÈ£¼öÀÎ ´ëûȣ¿¡¼­ÀÇ ½Ä¹° ÇöûũſÀÇ 1Â÷ »ý»ê·ÂÀ» ¾Ë¾Æº¸±â À§ÇÏ¿© ½ÇÇè½Ç°ú ÇöÀå¿¡¼­ ¿µ¾ç¿° ÷°¡ ¼³ÇèÀ» ½Ç½ÃÇÏ¿´´Ù. ½ÇÇèÀ» À§ÇÑ »ùÇÃÀ» 2009³â 9¿ù ´ëû´ï ¾Õ Á¤¼ö´ë ÁöÁ¡¿¡¼­ ä¼ö ÇÏ¿´À¸¸ç, ä¼öÇÑ »ùÇÃÀº Cubitainer¿¡ 6 L¾¿ ºÐ¹èÇÏ¿´´Ù. ´ëÁ¶±ºÀº(Control) ¿µ¾ç¿° ó°¡ ¾øÀÌ ¿ø¼ö ±×´ë·Î »ç¿ëÇÏ¿´À¸¸ç 6°³ÀÇ Ã³¸®±º(Treatment)¿¡´Â $KH_2PO_4$¿Í $KNO_3$À» ÀÌ¿ëÇÏ¿© P, 2P, 4P, $2NO_3$-N, $2NO_3$-N ±×¸®°í Áú¼Ò¿Í ÀÎÀº µ¿½Ã¿¡ ÷°¡ÇÑ P+$NO_3$-NÀÇ ³óµµ·Î ¿µ¾ç¿°À» ÷°¡ÇÏ¿´´Ù. ¿±·Ï¼Ò-$alpha$ (Chlorophyll-$alpha$)¿Í ÃÑÁú¼Ò(TN), ÃÑÀÎ(TP)ÀÇ ³óµµ º¯È­¸¦ ¸ÅÀÏ µ¿ÀÏÇÑ ½Ã°£¿¡ ºÐ¼®À» ½Ç½ÃÇÏ¿´´Ù. ´Ü±â ¿µ¾ç¿° ½ÇÇè¿¡¼­ ÀÎÀ» ÷°¡ÇØÁØ ½ÇÇ豺Àº ´ëÁ¶±ºÀ̳ª Áú¼Ò¸¦ ÷°¡ÇØÁØ Ã³¸®±º¿¡ ºñÇØ ½ÄǰÇöûũſÀÇ ¼ºÀåÀÌ ¶Ñ·ÇÀÌ ³ªÅ¸³µÀ¸¸ç, ÀÌµé °£ÀÇ ³ôÀº À¯ÀÇ ¼öÁØÀ» º¸¿´´Ù(p < 0.05). ¶ÇÇÑ °¡Àå ³ôÀº ÀÎÀÇ ³óµµ¸¦ ÷°¡ÇÑ 4P 󸮱º¿¡¼­ P, 2P 󸮱ºº¸´Ù ³ôÀº Á¶·ù ¼ºÀå·üÀ» º¸¿´´Ù. ¹Ý¸é Áú¼Ò¸¦ ÷°¡ÇÑ Ã³¸®±º¿¡¼­´Â Á¶·ù¼ºÀå°ú À¯ÀǼºÀ» º¸ÀÌÁö ¾Ê¾Ò´Ù(p > 0.20). ¿°¾ç¿° ÷°¡ ½ÇÇè°á°ú ÀϹÝÀûÀ¸·Î ´ã¼ö »ýŰ谡 Àο¡ ÀÇÇØ Á¦ÇÑ µÈ´Ù´Â ´Ù¸¥ ¿¬±¸°á°úµé°ú ÀÏÄ¡ÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ÇÑÆí Àΰú Áú¼Ò¸¦ µ¿½Ã¿¡ ÷°¡ÇÑ Ã³¸®±º¿¡¼­ °¡Àå ³·Àº Á¶·ù ¼ºÀå·üÀ» º¸¿´´Âµ¥, ÀÌ´Â Á¦ÇÑ ¿µ¾ç¿°ÀÌ Àο¡ ÀÇÇØ ÀÛ¿ë ÇÏ´õ¶óµµ Áú¼Ò¿Í ÇÔ²² ÷°¡µÉ °æ¿ì Á¶·ù ¼ºÀå ¾ïÁ¦ µÉ ¼ö ÀÖ´Â °ÍÀ¸·Î »ç·áµÈ´Ù. °ú°Å Àå±â°£ ÃøÁ¤µÈ ´ëû´ïÀÇ »ó´ëºñÀ² (TN:TP ratio)¿¡ µû¸£¸é ÀüüÀÇ 95% ÀÌ»óÀÌ 17À» ¿ùµîÈ÷ »óȸÇÏ´Â °ªÀ» º¸¿©(Forsberg and Ryding, 1980), ÃÑÀΰú ÃÑÁú¼ÒÀÇ »ó´ë ºñ¿¡ ÀÇÇØ¼­µµ Àο¡ ÀÇÇÑ Á¦ÇÑ ¿µ¾ç¿° È¿°ú°¡ ³ªÅ¸³µ´Ù. °á°úÀûÀ¸·Î ´ëûȣÀÇ Á¤¼ö´ë ºÎ±Ù¿¡¼­ ¿ëÁ¸ÀÎÀÌ ÀÏÁ¤·® ÀÌ»ó ÃæºÐÈ÷ À¯ÁöµÉ °æ¿ì, ¿ëÁ¸ÀÎÀº ½Ä¹°ÇöûũſÀÇ »ý»ê·Â°ú °­ÇÑ ¾çÀÇ »ó°ü°ü°è¸¦ º¸ÀÌ´Â °ÍÀ¸·Î »ç·áµÈ´Ù.
In situ experiments of Nutrient Enrichment Bioassays (NEBs) were conducted in the field along with in the laboratory to determine which nutrient limited phytoplankton growth as a indicator of primary productivity. For the NEBs, the water was sampled using a polyethylene-lined container and dispensed into 6 L water tank in the laboratory. The control (C, no nutrient spike) and six treatments of phosphorus (P), 2-fold phosphorus (2P), 4-fold phosphorus (4P), nitrate nitrogen ($NO_3$-N), 2-fold nitrate nitrogen ($2NO_3$-N), and phosphorus and nitrate nitrogen (P+$NO_3$-N) were set up in the lacustrine zone near the dam site, Daechung Reservoir in September, 2009 and analyzed the diel changes of total nitrogen (TN), total phosphorus (TP), and chlorophyll-$alpha$ (Chl-$alpha$) in the cubitainers. The short-term NEBs showed that algal response in the treatments spiked phosphorus (P, 2P, and 4P) were significantly (p < 0.05) greater than the response in the control (C), and nitrogen-spike. Also, the response in 4P-treatment was greater than those in the P- and 2P-treatments. In contrast, there was no significant differences (p > 0.20) between the $NO_3$-N and $2NO_3$-N treatment. The outcomes of the NEBs suggest that phosphorus limited the phytoplankton growth and nitrogen was not limited in this system. Furthermore, in the N + P treatments, the response was minimum, compared to all other treatments and the control, indicating that even if the system is evidently P-limited system, when added the nitrogen, the response showed the inhibition. Also, > 95% of observed long-term TN:TP ratios in the ambient water showed > 17, which is the criteria of P-limitation, supporting the P-limitation in the system. Overall, these results suggest that phytoplankton biomass near the dam is a direct linear function of P-loading near the watershed, if the phosphorus pool is mainly dissolved fraction.
 
Ű¿öµå
nutrient limitation;nutrient spike;Daechung Reservoir;chlorophyll;phosphorus;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.43, no.1, 2010³â, pp.136-141
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201023064630431)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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