摘要
对采自西藏林芝的喜马拉雅冷杉进行交叉定年后 ,建立树轮δ13 C序列 .将δ13 C序列去除生长趋势和大气CO2 浓度升高导致大气δ13 C下降影响得到Δ13 C ,利用附近气象资料 ,分析了Δ13 C对气候要素的响应 .结果表明 :冷杉Δ13 C的高频振荡与季节的气温、降水、空气相对湿度显著相关 ,并存在强的滞后效应 .冷杉Δ13 C序列与降水和空气相对湿度关系密切 ,在树木生长初期 4月和 9～ 11月 ,降水和空气湿度对年轮生长影响较大 ;除 3月年平均最低温度和年平均温度的 11、12月对年轮Δ13 C有一定影响外 ,温度对年轮生长影响小于降水和相对湿度的影响 .
Abies spectabibis\% were sampled in Nyingchi County of Tibet Autonomous Region and their stable carbon isotope ratios were measured from their α\|cellulose after cross\|dating. δ~ 13C values were corrected for changes in the δ~ 13C of CO 2 in the atmosphere and detrend to remove the effects of tree age. Simple linear and multivariate were used to determine the natural and strength of any climatic signal. Comparing the neighboring meteorological data, the response of climatic factors to δ~ 13C was analyzed. The results show that the high frequency vibration ofδ~ 13C has something to do with seasonal temperature, precipitation and air relative humidity with a time lag.
出处
《冰川冻土》
CSCD
北大核心
2002年第5期574-578,共5页
Journal of Glaciology and Geocryology
基金
中国科学院知识创新工程项目 (KZCX Y 0 5 )
中国科学院寒区旱区环境与工程研究所冰芯与寒区环境重点实验室知识创新项目 (ACX2 0 15 0 6)资助
