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http://dx.doi.org/10.14578/jkfs.2014.103.1.80

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined 210Pb Dating  

Ahn, Young Sang (Division of Forest Resources, Chonnam National University)
An, Ki-Wan (Division of Forest Resources, Chonnam National University)
Lee, Kye-Han (Division of Forest Resources, Chonnam National University)
Nakamura, Futoshi (Department of Forest Science, Hokkaido University)
Publication Information
Journal of Korean Society of Forest Science / v.103, no.1, 2014 , pp. 80-86 More about this Journal
Abstract
$^{210}Pb$ dating was conducted to examine the influence of land use changes in the forest catchment on lake sedimentation. The Kushiro River, into which Lake Takkobu drains under regular flow conditions, contributed to an increased sedimentation rate in sampling point at the lake outflow because turbid water from the Kushiro River flows back into Lake Takkobu during floods. The elevated sediment flux from the catchment dilutes the $^{210}Pb$ concentration in sampling points at the inflow of the Takkobu River and the lake outflow, which causes fluctuations in the $^{210}Pb$ concentrations in sediment cores. The $^{210}Pb$ dating was estimated using the CRS (Constant rate of Supply) model. The dates by the CRS model in Lake Takkobu profiles were in good agreement with the dates by $^{137}Cs$. Sedimentation rates reconstructed for the past 100-150 years suggested that sedimentation rates increased drastically following land use changes. While a natural sedimentation rate of $0.01-0.03g/cm^2/year$ is observed until the 1880s, whereas lake sedimentation accelerated to $0.03-0.09g/cm^2/year$ following land use changes such as deforestation and channelization, between the 1880s and 1940s. In particular, the sedimentation rates have been associated with deforestation, channelization, agricultural development and road construction, since the 1980s, and these rates were about 9-28 times higher than those under natural conditions, leading to accelerated lake shallowing.
Keywords
forest catchment; land use change; fine sediment; lake sedimentation; lake shallowing; $^{137}Cs$ dating; $^{210}Pb$ dating; Kushiro Mire;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Ahn, Y.S. and Nakamura, F. 2009. Influence of land use change in the forest catchment on sediment accumulation at the outlets of rivers; Reslts of a study in Kushiro Mire, northern Japan. Journal of Korean Forest Society 98(6): 669-675. (abstract in Korean)   과학기술학회마을
2 Ahn, Y.S., Nakamura, F., and Chun, K.W. 2010. Recently history of sediment dynamics in Lake Toro and applicability of $^{210}Pb$ dating in a highly disturbed catchment in northern Japan. Geomorphology 114(3): 284-293.   DOI   ScienceOn
3 Ahn, Y.S., Nakamura, F., and Mizugaki, S. 2008. Hydrology, suspended sediment dynamics and nutrient loading in Lake Takkobu, a degrading lake ecosystem in Kushiro Mire, northern Japan. Environmental Monitoring and Assessment 145(1-3): 267-281.   DOI
4 Appleby, P.G. and Oldfield, F. 1978. The calculation of $^{210}Pb$ dates assuming a constant rate of supply of unsupported $^{210}Pb$ to the sediment. Catena 5(1): 1-8.   DOI   ScienceOn
5 Mizugaki, S., Nakamuara, F., and Araya, T. 2006. Using dendrogeomorphology and $^{137}Cs$ and $^{210}Pb$ radiochronology to estimate recent changes in sedimentation rates in Kushiro Mire, Northern Japan, resulting from land use change and river channelization. Catena 68(1): 25-40.   DOI   ScienceOn
6 Foster, I.D.L. and Lees, J.A. 1999. Changes in the physical and geochemical properties of suspended sediment delivered to the headwaters of LOIS river basins over the last 100 years: A preliminary analysis of lake and reservoir bottom sediments. Hydrological Processes 13(7): 1067-1086.   DOI
7 He, Q., Walling, D.E., and Owens, P.N. 1996. Interpreting the $^{137}Cs$ profiles observed in several small lakes and reservoirs in southern England. Chemical Geology 129(1-2): 115-131.   DOI   ScienceOn
8 Kumagai, Y., Ahn, Y.S., and Nakamura, F. 2008. Recent human impact on vegetation in Takkobu, northern Japan, reconstructed from fossil pollen in lake sediments. Journal of Forest Research 13(4): 223-232.   DOI   ScienceOn
9 Nakamura, F. 2003. Restoration strategies for rivers, floodplains and wetlands in Kushiro Mire and Shibetsu River, northern Japan. Ecology and civil engineering 5(2): 217-232. (abstract in Japanese)   DOI   ScienceOn
10 Nakamura, F., Kameyama, S., and Mizugaki, S. 2004. Rapid shrinkage of Kushiro Mire, the largest mire in Japan, due to increased sedimentation associated with land-use development in the catchment. Catena 55(2): 213-229.   DOI   ScienceOn
11 Nakamura, F., Mieko, J., Kameyama, S., and Mizugaki, S. 2002. Changes in riparian forest in the Kushiro Mire, Japan, associated with stream channelization. River Research and Applications 18(1): 65-79.   DOI   ScienceOn
12 Nakamura, F., Sudo, T., Kameyama, S., and Mieko, J. 1997. Influences of channelization on discharge of suspended sediment and wetland vegetation in Kushiro Marsh, northern Japan. Geomorphology 18(3-4): 279-289.   DOI   ScienceOn
13 Walling, D.E., Owens, P.N., Foster, I.D.L., and Lees, J.A. 2003. Changes in the fine sediment dynamics of the Ouse and Tweed basins in the UK over the last 100-150 years. Hydrological Processes 17(16): 3245-3269.   DOI   ScienceOn
14 Appleby, P.G., Oldfield, F., Thompson, R., Huttenen, P., and Tolonen, K. 1979. $^{210}Pb$ dating of annually laminated lake sediments from Finland. Nature 280: 53-55.   DOI
15 Ahn, Y.S., Nakamura, F., Kizuka, T., and Nakamura, Y. 2009. Elevated sedimentation in lake records linked to agricultural activities floodplain, northern Japan. Earth Surface Processes and Landforms 34(12): 1650-1660.   DOI   ScienceOn
16 Ahn, Y.S., Mizugaki, S., Nakamura, F., and Nakamura, Y. 2006. Historical change in lake sedimentation in Lake Takkobu, Kushiro Mire, northern Japan over the last 300 years. Geomorphology 78(3-4): 321-334.   DOI   ScienceOn