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Elevated sedimentation in lake records linked to agricultural activities in the Ishikari River floodplain, northern Japan

Auteur(s) et Affiliation(s)

AHN, Y.S.
Dep. of Forest Science, Graduate School of Agriculture, Hokkaido Univ., Sapporo, Japon
Division of Forest Soil Conservation, Dep. of Forest Environment, Korea Forest Research Inst., Seoul, Coree, Republique de
NAKAMURA, F.
Dep. of Forest Science, Graduate School of Agriculture, Hokkaido Univ., Sapporo, Japon
KIZUKA, T.
Dep. of Agricultural Engineering, Graduate School of Agriculture, Hokkaido Univ., Sapporo, Japon
NAKAMURA, Y.
Inst. of Seismology and Volcanology, Graduate School of Science, Hokkaido Univ., Sapporo, Japon


Description :
The purpose of this study was to examine the historical change in sedimentation rates in lakes that have been impacted by river regulation and agricultural activities in the Ishikari River floodplain. The AA. dated sediment cores using 137Cs dating and tephrochronology, and they estimated sediment sources from 137Cs concentrations in the topsoil of representative land covers (river banks, adjacent floodplains, cultivated lands, and reed swamps). They then focused on the changes in the lake sedimentation rate before and after the establishment of agricultural drainage network. Third, they compared the sedimentation rates from drainage networks across 8 different lakes, each of which is associated with different surrounding land-use conditions. Their approach included analyses of the catchment-derived 137Cs contribution and the 137Cs inventory. Discussion of the results.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 12, p. 1650-1660, nombre de pages : 11, Références bibliographiques : 26 ref.

Date :
2009

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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