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Çѱ¹È¯°æ»ýÅÂÇÐȸ / v.23, no.6, 2009³â, pp.569-576
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»ê¸²À¯¿ªÀÇ ÅäÁöº¯Çü¿¡ µû¸¥ ¼öÁú°ú Åä»ç»ý»ê·® º¯È - ÀϺ» ½Ã¶ó·çÅä·ÎÈ£¼ö Áö¿ªÀÇ ¿¬±¸ °á°ú -
( Changes in Water Quality and Sediment Yield in the Forest Catchment - A Study of the Lake Shirarutoro Area in Northern Japan - ) |
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»ê¸²¹úä¿Í ³ó°æÁö °³¹ß¿¡ ÀÇÇÑ Åä»ç¿Í ¿µ¾ç¿°·ùÀÇ À¯ÃâÀº ½Ã¶ó·çÅä·ÎÈ£¼öÀÇ »ý¹°¼½ÄÁö ȯ°æÀ» ¾ÇȽÃ۰í ÀÖ´Ù. »ê¸²¹úä¿Í ³ó¾÷Ȱµ¿ÀÌ ¼öÁú¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Á¶»çÇϱâ À§ÇØ »ê¸²¹úä¿Í ³ó°æÁö °³¹ß¿¡ ÀÇÇÑ Åä»ç¿Í ¿µ¾ç¿°·ùÀÇ À¯ÃâÀº ½Ã¶ó·çÅä·ÎÈ£¼öÀÇ »ý¹°¼½ÄÁö ȯ°æÀ» ¾ÇȽÃ۰í ÀÖ´Ù. »ê¸²¹úä¿Í ³ó¾÷Ȱµ¿ÀÌ ¼öÁú¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Á¶»çÇϱâ À§ÇØ ÅäÁöÀ̿뿡 µû¸¥ ÃÑÁú¼Ò¿Í ÃÑÀÎÀÇ º¯È¸¦ ºÐ¼®Çϰí, À̵éÀÇ ºÐ¼® °á°ú¸¦ ´Ù¸¥ ¿¬±¸ÀÚ·á¿Í ºñ±³ÇÏ¿´´Ù. È£¼öÀÇ ÃÑÁú¼Ò¿Í ÃÑÀÎÀº »ê¸²¸éÀû Áõ°¡¿¡ µû¶ó °¨¼ÒÇϰí, ³óÁö¸éÀûÀÌ Áõ°¡ÇÏ¸é ³ôÀº ³óµµ¸¦ ³ªÅ¸³»¾ú´Ù. ±×·¯³ª ½Ã¶ó·çÅä·ÎÈ£¼öÀÇ ¼öÁúÀº Á¼Àº ³óÁö¸éÀû°ú ³ÐÀº »ê¸²À¸·Î µÑ·¯½Î¿© ÀÖÀ½¿¡µµ ºÒ±¸Çϰí ÃÑÁú¼Ò¿Í ÃÑÀÎÀÇ ³óµµ°¡ ³ô°Ô ³ªÅ¸³µ´Ù. ÀÌ´Â À¯¿ªÀÇ ÅäÁöÀÌ¿ëÀÌ È£¼ö¿¡ ÀÎÁ¢ÇÑ °÷¿¡¼ ÇàÇØÁö°í ÀÖ¾î È£¼ö ¼öÁú¿¡ ¿µÇâÀ» ¹ÌÄ£ °ÍÀ¸·Î »ç·áµÇ¾ú´Ù. ÅäÁöÀ̿뿡 µû¸¥ À¯¿ªÀÇ Åä»ç»ý»ê·® º¯È¸¦ ÃßÁ¤Çϱâ À§ÇØ È£¼ö Åä»çÅðÀû¹° ½Ã·á 11°³¸¦ äÃëÇÏ¿© ¾à 300³â µ¿¾ÈÀÇ Åä»çµ¿Å¸¦ Á¶»çÇÏ¿´´Ù. äÃëÇÑ È£¼ö ÅðÀû¹°¿¡´Â 2°³ÀÇ È»êÀçÃþ(1694³âÀÇ Ko-c2Ãþ °ú 1739³âÀÇ Ta-aÃþ)°ú ¼¼½·($^{137}Cs$)ÇÇÅ©(1963³â)°¡ Á¸ÀçÇÏ¿´°í, À̵éÀÇ ¿¬´ë¸¦ ÀÌ¿ëÇÏ¿© ¾à 300³â°£ À¯¿ªÀÇ Åä»ç»ý»ê·®À» ºÐ¼®ÇÏ¿´´Ù. Ãʱⰳ¹ß±â(1694~1739°ú 1739~1963)¿¡´Â 8.4~8.9 tons/$km^2$/yearÀÇ Åä»ç°¡ À¯¿ªÀ¸·ÎºÎÅÍ »ý»êµÇ¾ú°í, 1960³â´ë ÀÌÈÄ »ê¸²¹úä¿Í ³óÁö°³¹ß·Î ÀÎÇÏ¿© 21.1 tons/$km^2$/year(1963~2007)À¸·Î Åä»ç»ý»ê·®ÀÌ Áõ°¡ÇÏ¿´´Ù. |
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Sediment and nutrient loading caused by the removal of forest cover and alteration of agricultural lands in catchments have led to the deterioration in Lake Shirarutoro. To examine the effects of deforestation and agricultural activities on water quality, I examined changes in total nitrogen (TN) and total phosphorus (TP) of lake water induced by land use change, and compared them with the various research data produced over the years. Our investigation showed that the level of TN and TP in the lake water decreased when forest cover increased but increased when farmland area increased. The concentration of TN and TP was high in Lake Shirarutoro despite that its catchment was surrounded by large forests and small farmlands. This result indicates that land uses near Lake Shirarutoro have affected the quality of the lake water. I have examined the changes of sediment yield in the lake's catchment over the last approximately 300 years. Eleven core samples were obtained from the lake sediment and analyzed to establish a chronology after using two tephra layers (Ko-c2 in 1694 and Ta-a in 1739) and a $^{137}Cs$ peak (in 1963). The average sediment yield under the natural condition during the first two periods was 8.4 tons/$km^2$/year in 1694~1739 and 8.9 tons/$km^2$/year in 1739~1963 respectively. The conversion of the Shirarutoro catchment into agricultural lands and deforestation intensified, leading to an increased sediment yield of 21.1 tons/$km^2$/year during 1963~2007. |
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Ű¿öµå |
»ê¸²¹úä;³ó°æÁö;ÃÑÁú¼Ò;ÃÑÀÎ;¼¼¸³Åä»ç;DEFORESTATION;AGRICULTURAL LAND;TOTAL NITROGEN(TN);TOTAL PHOSPHORUS(TP);FINE SEDIMENT; |
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Çѱ¹È¯°æ»ýÅÂÇÐȸÁö / v.23, no.6, 2009³â, pp.569-576
Çѱ¹È¯°æ»ýÅÂÇÐȸ
ISSN : 1229-3857
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200912368301444)
¾ð¾î : ¿µ¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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