树轮稳定碳同位素组成序列与降水变化  

STABLE CARBON ISOTOPIC COMPOSITIONS SERIES OF TREERING (δ^（13）C_t)AND RAINFALL VARIATION

作　　者：刘广深[1] 洪业汤[2] 朴河春[2] 姜洪波[2] 陶发祥[2] 

机构地区：[1]长春科技大学地球化学系,长春130062 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002

出　　处：《矿物学报》1997年第1期93-99,共7页Acta Mineralogica Sinica

摘　　要：以长白山红松年轮为气候环境变化的生物记录体，通过分析树轮纤维素的稳定碳同位素组成，从树轮稳定碳同位素组成序列中提取生长环境的降水变化信息。研究结果揭示：树轮稳定碳同位素组成序列与东北地区平均年降水量具有基本平行的变化趋势；在长白山乃至东北地区，降水量沿着自身变化趋势是明显的准22年周期性波动。Samples were taken from Pinus Koraiensis, a prevailing tree species in Northeast China，in Antu (128°8’E, 42°24’N), Yanbian District, Jilin Province From the three sampled trees, for which consistent results were obtained by cross dating, one with the largest time span (17891988) was selected in this study. The tree-rings were carefully separated one after another and αfabrics were extracted for stable carbon isotope analysis. The results of δ13Ct of the 200 tree rings from 1789-1988 show that δ13Ct variation can be taken as a function of rainfall inthe region studied;obvious quasi-22-year periodicity can be seen in the fitted δ13Ct curves (at a smoothing degree of 0. 6). The environmental-climate implications of the fitted δ13Ct curves (at a smoothing degree of 0. 6) varying in a synchronous and parallel way with the ten-year average rainfall curve in Northeast China as demonstrated in Fig. 2 consistent with:(1) Rainfall information during the historic past can be obtained by tracing back in time from the δ13Ct data.(2) The parallel variation between δ13Ct and annual average rainfall also suggests.that local rainfall is consistent with the regional patterns.

关 键 词：树轮纤维素 稳定碳同位素 降水变化 

分 类 号：P597[天文地球—地球化学] P426.614[天文地球—地质学]