A 50-year vegetation reconstruction for the Lake Shumarinai watershed, Hokkaido, Japan based on Pb-210 and Cs-137 dating and pollen analysis

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  • 鉛-210・セシウム-137法による年代測定ならびに花粉分析に基づく朱鞠内湖集水域における過去50年間の植生復元
  • ナマリ 210 セシウム 137ホウ ニ ヨル ネンダイ ソクテイ ナラビニ カフン ブンセキ ニ モトズク シュ マリ ナイコ シュウスイイキ ニ オケル カコ 50ネンカン ノ ショクセイ フクゲン

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A reconstruction of the vegetation during the last 50 years for the Lake Shumarinai watershed, northern Hokkaido, Japan was carried out using pollen data from a sediment core. The average sedimentation rate was estimated as ca. 3mm year^<-1> based on Pb-210 and Cs-137 dating. Compared with other lakes in Japan the sedimentation rate is 1.5 times higher than for Lake Biwa and Lake Kizaki, and one-fourth that of Lake Suwa. In the present study, pollen accumulation rates for the last 40 years ranged between 1.7×10^4 and 2.9×10^4 grains cm^<-2> year^<-1>. Pollen assemblages were dominated by deciduous trees such as Quercus subgenus Lepidobalanus, Betula and Alnus with conifers such as Abies and Picea occurring throughout the core. These data indicate that, over the last 50 years, the vegetation of the Lake Shumarinai watershed has been similar to the current mixed forest which consists of Quercus mongolica var. grosseserrata, Betula ermanii, Alnus japonica, Abies sachalinensis and Picea glehnii.

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