Chen Tuo, Qin Dahe, Liu Xiao-hong, Ren Jiawen, Li Jiangfeng
Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
Ying Yong Sheng Tai Xue Bao. 2003 Sep;14(9):1469-72.
Since industrial revolution, a large amount of anthropogenic CO2 from fossil fuel combustion and deforestation has been emitted into atmosphere, and thus, the atmospheric CO2 concentration increased rapidly, while the delta 13C in atmospheric CO2 became lower and lower due to Suess effect. Therefore, the prediction of delta 13C is crucial for studying global changes. In order to make an accurate prediction, it is necessary to understand its historical variation. The dynamics of delta 13C in plants can sensitively reflect it. In this paper, the dynamics of delta 13C in atmospheric CO2 in the past 440 years in Aleitai, Xinjiang were reconstructed by using tree-ring delta 13C series and plant stable carbon isotope fractionation model. The results showed that atmospheric delta 13C value was relatively constant before 1,850 (R2 = 0.052), which was about -6.60@1000, while a sharp decrease in atmospheric delta 13C with an average of -7.02@1000 was found since 1,850 (R2 = 0.65). Compared with those from ice core bubbles, more fluctuations were found in atmospheric delta 13C derived from tree-ring series, possibly due to the higher resolution of the latter, and the difference of real atmospheric delta 13C between the growth site of the tree and the globe.
自工业革命以来，大量因化石燃料燃烧和森林砍伐产生的人为二氧化碳被排放到大气中，因此，大气中的二氧化碳浓度迅速上升，而由于苏士效应，大气二氧化碳中的δ13C值却越来越低。所以，预测δ13C对于研究全球变化至关重要。为了做出准确预测，有必要了解其历史变化。植物中δ13C的动态变化能够灵敏地反映这一点。本文利用树木年轮δ13C序列和植物稳定碳同位素分馏模型，重建了新疆阿勒泰地区过去440年大气二氧化碳中δ13C的动态变化。结果表明，1850年之前大气δ13C值相对稳定（R2 = 0.052），约为-6.60‰，而自1850年以来，大气δ13C值急剧下降，平均为-7.02‰（R2 = 0.65）。与冰芯气泡中的数据相比，树木年轮序列得出的大气δ13C值波动更大，这可能是由于树木年轮数据分辨率更高，以及树木生长地点与全球实际大气δ13C存在差异所致。
