密云山区油松树轮δ^(13)C对气温和降水量变化的响应  

Response of Stable Carbon Isotope of Tree-Ring to Temperature and Precipitation Changes in Pinus tabulaeformis in Miyun Mountain Area

作　　者：路伟伟[1] 余新晓[1] 贾国栋[1] 李瀚之 刘自强[1] Lu Weiwei;Yu Xinxiao;Jia Guodong;Li Hanzhi;Liu Ziqiang(Beijing Laboratory of Urban and Rural Ecological Environmert Key Laboratory of Soil and Water Conservation and Desertification Combating of Education Ministry College of Soil and Water Conservation,Beijing Forestry University Beijing 100083)

机构地区：[1]北京林业大学水土保持学院教育部水土保持与荒漠化防治重点实验室城乡生态环境北京实验室,北京100083

出　　处：《林业科学》2018年第3期1-7,共7页Scientia Silvae Sinicae

基　　金：国家自然科学基金面上项目"基于稳定同位素的典型森林生态系统水;碳过程及其耦合机制研究"(41430747);青年科学基金项目"北京山区主要造林树种水分利用机制及其生理生态响应研究"(41401013);科技创新服务功能建设-协同创新中心-林果业生态环境功能提升协同创新中心(PXM2017_014207_000043);北京市共建项目专项资助(城乡生态环境北京实验室)

摘　　要：【目的】探究北京市密云山区油松树轮δ^(13)C对气温和降水量变化的响应,重建1947—2014年密云山区气候资料,以期为揭示该地区的气候变化规律提供依据。【方法】测定密云山区红门川流域油松树轮δ^(13)C值,建立1947—2014年的树轮δ^(13)C序列,并剔除序列值中受大气CO_2碳同位素值影响产生的下降趋势,之后获得油松树轮δ^(13)C去趋势序列(DS),然后结合当地气象站资料分析油松树轮δ^(13)C值对降水和气温变化的响应,构建δ^(13)C与降水和气温的关系方程,进而重建1947—2014年的降水和气温资料。【结果】1947—2014年,密云山区油松树轮δ^(13)C呈下降趋势,其中,1995—2014年波动较大,剔除大气CO_2背景值的DS序列呈现二次曲线的走势,拐点出现在1980年附近;油松树轮δ^(13)C值DS序列与7月平均气温等极显著正相关(r=0.719 7,P<0.01),利用回归方法重建1947—2014年密云山区7月份平均气温,平均值为25.67℃,重建曲线显示该地区气温呈先下降后上升趋势;油松树轮δ^(13)C值DS序列与夏季降水量极显著负相关(r=-0.696 7,P<0.01),利用回归方法重建了1947—2014年密云山区夏季降水量,平均值为450.3 mm,自1980年以后,降水量年际变化出现较大波动,并且下降趋势明显。【结论】油松树轮δ^(13)C对7月份气温和夏季降水量响应极为显著;1947—2014年密云山区气候变化呈现波动性变暖变干趋势。【Objective】To reconstruct the history of climate change and reveal climatic characteristics from 1947 to 2014 in Miyun mountainous area,based on stable carbon isotope(δ13 C)of tree-ring in Pinus tabulaeformis.【Method】In this paper,tree-ring samples of Pinus tabulaeformis in Miyun mountain area were collected to analyze tree-ringδ13 C.Moreover,we eliminated the effect of atmospheric CO 2 from originalδ13 C series and establish the de-trend series(DS)of tree-rings.Then,regression equations were established based on analysis of the correlation ofδ13 C DS combined with temperature and precipitation,and further reconstructed the temperature and precipitation histories from 1947 to 2014.【Results】From 1947 to 2014:tree-ringδ13 C series had a downward trend with a big fluctuation from 1997 to 2014.A quadric curve trend was found in tree-ring DS.Tree-ringδ13 C DS is extremely and positively correlated with July temperature(r=0.719 7,P<0.01).The average temperature of July from 1947 to 2014 were reconstructed with regression method.Results showed that the average temperature of July firstly declined and then increased since 1980 with an average of 25.67℃.The tree-ringδ13 C DS was extremely and negatively correlated with summer precipitation(r=-0.696 7,P<0.01).Summer precipitation data from 1947 to 2014 were reconstructed with regression method.Results showed that the average summer precipitation was 450.3 mm.After 1980,summer precipitation fluctuated sharply with an evident declining trend.【Conclusion】The response of tree-ringsδ13 C in Pinus tabulaeformis to July temperature was extremely and positively significant.The tree-ringδ13 C values were extremely and negatively influenced by summer precipitation.Overall,the climate in Miyun mountainous area showed a fluctuated warming and drying trend from 1947 to 2014.

关 键 词：密云山区 树木年轮 δ13 C 气温 降水 气候变化 

分 类 号：S718.5[农业科学—林学] X173[环境科学与工程—环境科学]