西伯利亚落叶松树轮稳定碳同位素对气候的响应  

Response of Stable Carbon Isotope of Larix sibirica Ledeb. Tree-rings to Climate Change

作　　者：张瑞波[1] 袁玉江[1] 魏文寿[1] 尚华明[1] 喻树龙[1] 张同文[1] 陈峰[1] 范子昂[1] 秦莉[1] 

机构地区：[1]中国气象局乌鲁木齐沙漠气象研究所,新疆维吾尔自治区树木年轮生态重点实验室,中国气象局树木年轮理化研究重点开放实验室,新疆乌鲁木齐830002

出　　处：《干旱区研究》2012年第2期328-334,共7页Arid Zone Research

基　　金：国家自然科学基金(40975056,41071072)国家自然科学重大基金(40890051)资助;中国沙漠气象科学研究基金(Sqj2010005);冰冻圈科学国家重点实验室开放基金(SKLCS2011-05);科技部公益性行业(气象)科研专项(GYHY200806011);中央级公益性科研院所基本科研业务费项目(IDM200801);国家重点基础研究发展计划项目(2010CB951001)

摘　　要：利用采自阿尔泰山南坡东段正格采点的西伯利亚落叶松树轮样本,建立树轮宽度年表,对比宽度年表,按照树轮稳定碳同位素研究步骤,提取树轮稳定碳同位素序列(δ13C)和去趋势序列(DS)。分析表明:阿尔泰山南坡东部近160 a西伯利亚落叶松树轮δ13C变化于-22.8‰～-25.4‰,平均值为-24.0‰,变差系数-0.017。相关分析表明:正格采点树轮宽度序列对各气候要素相关不显著;树轮去趋势序列(DS)对前期气候因子的响应也不敏感;在生长季内(5～9月),树轮去趋势序列(DS)与富蕴气象站平均气温、平均最高气温和平均相对湿度有较好的相关性,树木生长季内的平均气温、平均最高气温与树轮去趋势序列(DS)显著正相关,6～7月平均最高气温与去趋势序列(DS)相关达到0.611(P<0.000 001);与生长季内平均相对湿度呈负相关关系,其中6～7月相对湿度与去趋势序列(DS)相关最高(r=-0.493,P<0.001),与7月降水量呈负相关关系(r=-0.459,P<0.01)。生长季内的平均最高气温和相对湿度对阿尔泰山西伯利亚落叶松树轮δ13C的响应最为敏感,阿尔泰山西伯利亚落叶松树木碳同位素分馏的主要控制因子为6～7月的平均最高气温,降水对树轮稳定碳同位素影响不大,相对湿度对树轮稳定碳同位素没有直接影响。Stable isotopes in tree rings are the important approaches in climate reconstruction and in studies on tree response to environmental factors in the past,such as the maximum latewood density,tree ring width and other tree ring parameters.In this paper,the tree-ring samples of Larix sibirica Ledeb.collected in south slope of the Altay Mountains in 2009 were used to develop the tree-ring width chronology and stable carbon isotope series based on the standard Dendrochronology methods and stable carbon isotope research achievements.It can establish the de-trend series（DS） of stable carbon isotope of tree rings to eliminate atmospheric CO2 effect from original δ13C.The stable carbon isotope series values of L.sibirica tree rings varied in a range of-22.8‰——25.4‰,The average value was-24.0‰,and the coefficient of variation was-0.017.Width chronology and stable carbon isotope de-trend series were compared with monthly climatic factors（mean temperature,mean maximum temperature,mean minimum temperature,precipitation,relative humidity and sunshine duration） at Fuyun Meteorological Station.Correlation analysis revealed that there was a strong positive correlation between the stable carbon isotope de-trend series and the mean temperature and mean maximum temperature but a negative one between it and the relative humidity in growing season.The correlation coefficient between the de-trend series of stable carbon isotope and the monthly maximum temperature in June and July was as high as 0.611（P0.000 001）,that between it and the monthly relative humidity in June and July was-0.493（P0.001）,and that between it and monthly precipitation in July was-0.459（P0.01）.The response of stable carbon isotope of L.sibirica tree rings to temperature and relative humidity in growing season was the most sensitive.The main factor affecting stable carbon isotope of L.sibirica was the monthly maximum temperature in June and July.

关 键 词：西伯利亚落叶松(Larix sibirica Ledeb.) 树木年轮 稳定碳同位素 气候响应 阿尔泰山 

分 类 号：P461[天文地球—大气科学及气象学]