作　　者： ; ; ; ;

机构地区： 中国科学院华南植物研究所

出　　处： 《生态学杂志》 2001年第1期13-17,共5页

摘　　要： Based on the experimental results from seven subtropical species,in contrast with other researchers′ results, the parameter Ci/Ca (ratio of substomatal CO 2 to atmospheric CO 2 concentration)is not stable,but varies with species and environmental factors,especially light intensity.Thus,we concluded that the use of tree ring isotope ratios in the reconstruction of atmospheric CO 2 isotope ratio δa variation,which is based on the assumption that Ci/Ca keeps stable during assimilation,is not reliable under current circumstances. Based on the experimental results from seven subtropical species,in contrast with other researchers′ results, the parameter Ci/Ca (ratio of substomatal CO 2 to atmospheric CO 2 concentration)is not stable,but varies with species and environmental factors,especially light intensity.Thus,we concluded that the use of tree ring isotope ratios in the reconstruction of atmospheric CO 2 isotope ratio δa variation,which is based on the assumption that Ci/Ca keeps stable during assimilation,is not reliable under current circumstances.

关 键 词： 树木 年轮 大气 二氧化碳

领　　域： [生物学]