韓国大岩山(デアムサン)高層湿原の環境変遷  [in Japanese] Environmental change in Dae-Am Sang high moor, Korea  [in Japanese]

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Abstract

The environmental change in Yong-Nup of Dae-Am Sang, which locates near Demilitarization Zone at 38°N and has been reported as the one and only high moor in the Korea Peninsula, was assessed with sedimentary carbon and nitrogen isotope analyses. The surface layer of the sediment (0-5 cm) was 190 year BP, and the middle layers (30-35 and 50-55 cm) were 870 and 1900 year BP, respectively. Bulk sedimentation rate was estimated to be about 0.4 mm year^<-1> for 0 to 30 cm. The ^<14>C age of the bottom sediment (75-80 cm in the dept) was about 1900 year BP, although it was reported that the center of the moor has been developed since about 4500 year BP. Since the ^<14>C ages for 50-55 cm and 75-80 cm layers were almost the same each other, we have estimated that the deep layers (55-80 cm) in the high moor were the original forest soil. The low organic C and N contents in the deeper layers supported the inference. The 50-55 cm layer contains much sandy material and showed very low organic content, suggesting the erosion (flooding) from the surrounding area. In these context, the Dae-Am Sang high moor might have developed to the sampling site at about 1900 year BP. The δ^<13>C value of organic carbon and the δ^<15>N values of total nitrogen in the sediments fluctuated with depth. The profile of δ^<13>C may indicate that the Dae-Am Sang high moor have experienced the dry-wet and cool-warm cycle during the development of the swamp. The δ^<15>N may indicate that the nitrogen cycling in the swamphave changed from the closed (regeneration depending) system to the open (rain NO_3^= and N_2 fixation depending) system during the development of the high moor.タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 1997 (平成9)年度

The environmental change in Yong-Nup of Dae-Am Sang, which locates near Demilitarization Zone at 38°N and has been reported as the one and only high moor in the Korea Peninsula, was assessed with sedimentary carbon and nitrogen isotope analyses. The surface layer of the sediment (0-5 cm) was 190 year BP, and the middle layers (30-35 and 50-55 cm) were 870 and 1900 year BP, respectively. Bulk sedimentation rate was estimated to be about 0.4 mm year^<-1> for 0 to 30 cm. The ^<14>C age of the bottom sediment (75-80 cm in the dept) was about 1900 year BP, although it was reported that the center of the moor has been developed since about 4500 year BP. Since the ^<14>C ages for 50-55 cm and 75-80 cm layers were almost the same each other, we have estimated that the deep layers (55-80 cm) in the high moor were the original forest soil. The low organic C and N contents in the deeper layers supported the inference. The 50-55 cm layer contains much sandy material and showed very low organic content, suggesting the erosion (flooding) from the surrounding area. In these context, the Dae-Am Sang high moor might have developed to the sampling site at about 1900 year BP. The δ^<13>C value of organic carbon and the δ^<15>N values of total nitrogen in the sediments fluctuated with depth. The profile of δ^<13>C may indicate that the Dae-Am Sang high moor have experienced the dry-wet and cool-warm cycle during the development of the swamp. The δ^<15>N may indicate that the nitrogen cycling in the swamphave changed from the closed (regeneration depending) system to the open (rain NO_3^= and N_2 fixation depending) system during the development of the high moor.

Journal

  • Summaries of Researches using AMS at Nagoya University

    Summaries of Researches using AMS at Nagoya University 9, 179-192, 1998-03

    Nagoya University

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