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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.36, no.3, 2003³â, pp.304-310
ºÎ¿µ¾çÈ£ ÅðÀûÃþÀ¸·ÎºÎÅÍ ¿ëÁ¸À¯±â¹°ÀÇ ¿ëÃâÆ¯¼º
( Characteristics of DOC Release from Sediment in Eutrophic Lake )
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¼ö½ÉÀÌ ¾è°í ºÎ¿µ¾ç È£¼ÒÀÎ L. Kasumigaura¸¦ ´ë»óÀ¸·Î ÅðÀûÃþÀ¸·ÎºÎÅÍ À¯±â¹° ¿ëÃâÆ¯¼ºÀ» Á¶»çÇÏ¿´´Ù. ÅðÀû¹°ÀÇ ÇÔ¼öÀ²Àº ¾à 80%ÀÌ»óÀ» Â÷ÁöÇϰí ÀÖ¾úÀ¸¸ç °ø±Ø¼öÀÇ DOC³óµµ´Â Ç¥Ãþ¿¡¼­ ³ô°í ±í¾îÁú¼ö·Ï °¨¼ÒÇÏ´Â °æÇâÀ» ³ªÅ¸³Â´Ù. ƯÈ÷ Á¶»ç±â°£Áß °ø±Ø¼öÀÇ DOC³óµµ(104mg C/l)°¡ Å©°Ô Áõ°¡ÇÏ¿© °ø±Ø¼ö·ÎºÎÅÍ ¼öü·Î ¿ëÃâ °¡´É¼ºÀÌ ³ôÀ» °ÍÀ¸·Î ÃßÁ¤µÇ¾ú´Ù. DOC ¿ëÃâ½ÇÇè°á°ú, È£±âÁ¶°Ç¿¡¼­´Â Labile-DOC (L-DOC)¿ëÃâÀÌ °ÅÀÇ °üÃøµÇÁö ¾Ê¾Ò°í Refractory-DOC (R-DOC)¸¸ °üÃøµÇ¾úÀ¸¸ç, Çø±âÁ¶°Ç¿¡¼­´Â L-DOC¿Í R-DOC ¸ðµÎ ¿ëÃâµÇ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ÀÌ·¯ÇÑ °á°ú´Â ÅðÀûÃþÀÇ »óºÎ¼öÃþ¿¡ DO°¡ ÃæºÐÈ÷ À¯ÁöµÇ¸é L-DOC´Â ¿ëÃâµÇ¾îµµ È£±â¼º bacteria¿¡ ÀÇÇØ ½±°Ô ºÐÇØµÇ±â ¸Å¹®¿¡ R-DOC¸¸ ¿ëÃâµÇ´Â °ÍÀ¸·Î Á¶»çµÇ¾úÀ¸¸ç, Çø±âÁ¶°ÇÇÏ¿¡¼­´Â Çø±â¼º bacteriaÀÇ À¯±â¹° ºÐÇØ´É·ÂÀÇ °¨¼Ò·Î L-DOC¿Í R-DOC¸ðµÎ ¿ëÃâµÇ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. °á°úÀûÀ¸·Î ³»ºÎ»ý¼º±â¿øÀÇ À¯±â¹°Áß ÅðÀûÃþÀ¸·ÎºÎÅÍ R-DOC ¿ëÃâÀº ¼öüÀÇ À¯±â¹° ³óµµ¸¦ Áõ°¡½ÃŰ´Â ÁÖ¿ä ¿øÀÎÀ¸·Î ³ªÅ¸³µÀ¸¸ç, ¼öÁß À¯±â¹°ÀÇ ´ëºÎºÐÀ» Â÷ÁöÇϰí ÀÖ´Â R-DOC´Â À¯±â¹°¼øÈ¯¿¡ Áß¿äÇÑ ¿ªÇÒÀ» ´ã´çÇϰí ÀÖ´Ù´Â »ç½ÇÀÌ È®ÀεǾú´Ù.
This study was conducted to estimate the internal dissolved organic carbon (DOC) loading from sediment in eutrophic shallow Lake Kasumigaura. Contents of water and organic carbon were about 80% and 6.3% with depth in the sediment, respectively. The highest DOC concentration in porewater (104 mg C/l) was observed in September suggesting that the porewater could play an important role as an internal loading of DOC. Results of DOC release experiments showed that the labile-DOC (L-DOC) release was not detected in the oxic condition, while refractory-DOC(R-DOC) release was detected. The L-DOC and R-DOC release rates in the anoxic codition ranged from 14.5${sim}$ 48.6, 14.4 ${sim}$27.3 mgC $m^{-2}$ $d^{-2}$, respectively. The current study showed that L-DOC released in the oxic condition was rapidly utilized by aerobic bacteria, in contrast, L-DOC and R-DOC released in anoxic codition were slowly utilized by anaerobic bacteria. These results suggested that L-DOC and R-DOC were closely related to sediment release and most of the R-DOC released could be an important source of DOC in eutrophic lakes during summer. Therefore, R-DOC pool should be added as one of the important energy source for microbial-based aquatic food webs in eutrophic lakes.
 
Ű¿öµå
shallow eutrophic lake;porewater;sediment;release;dissolved organic carbon (DOC);labile-DOC;refractory-DOC;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.36, no.3, 2003³â, pp.304-310
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200318317181582)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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