[Updated on Apr. 18] Integration of CiNii Articles into CiNii Research

琵琶湖南岸地域のヒノキ年輪の安定炭素同位体比変動と気候要素との相関分析

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Abstract

We investigated that the climatic factors controlling the stable carbon isotopic composition of annual rings of Japanese cypress (Chamaecyparis obtusa). Four grubs with more than 100 rings, which were collected at a coastal region of Lake Biwa, were used for isotopic analysis. The δ^<13>C values of annual rings from 1936 to 1987 were measured in the all four samples. There was little spatial δ^<13>C variation of annual rings in the present study area within a radius of 15 km, since the correlation coefficients in interzonal comparison (r=0.52 to 0.69) were identical with those of the individual variations in one forest (r=0.57 to 0.70). This result suggested that the δ^<13>C values of annual rings were mainly influenced by the extensive environmental factors at least 30 km. The δ^<13>C fluctuations of annual rings from the secular trends were compared with the monthly meteorological data, i.e., temperature, precipitation, number of precipitation days and sunshine duration, and showed the best correlation with sunshine (positive, r=0.44) and precipitation (negative, r=-0.32) in early summer.

タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 1999 (平成11)年度

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