樟子松树轮不同组分的稳定碳同位素分析  

Analysis of stable carbon isotopes in different components of tree rings of Pinus sylvestris var. mongolica

作　　者：商志远[1] 王建[1] 崔明星[2] 陈振举[2] 王志军 刘丰 钱君龙[5] 

机构地区：[1]南京师范大学地理科学学院,南京210046 [2]中国科学院沈阳应用生态研究所,沈阳110016 [3]大兴安岭松岭区委,大兴安岭165012 [4]大兴安岭新林林业局,大兴安岭165025 [5]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《生态学报》2011年第18期5148-5158,共11页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(40871010);国家重点基础研究发展规划项目(2003CB415201-8);教育部长江学者创新团队基金项目(YST2006-006);江苏高校优势学科建设工程资助项目

摘　　要：对大兴安岭北部樟子松树轮中的全木、综纤维素和α纤维素3种组分按早晚材分别测定稳定碳同位素(δ13C)值,分析比较早晚材两种材质的3种组分δ13C值差异,探讨其对气候环境变化的响应。结果表明:从组分来看,樟子松树轮综纤维素的δ13C指标更接近于α纤维素;从材质来看,樟子松树轮晚材不同组分的稳定碳同位素信号对气候环境变化响应的一致性和敏感程度要大于早材。樟子松树轮晚材的综纤维素δ13C指标是研究过去气候或环境变化的理想载体,而α纤维素在提取过程中很可能丢失了部分气候信息。Analysis of stable isotopes in tree rings is an important tool for global change research.There are two major advantages of using tree ring stable isotope data;they can be used for paleoclimate reconstructions with perfect annual resolution,and the confidence limits can be statistically defined.In addition,trees grow worldwide,and so it is possible to examine geographical climatic variations that have occurred in the past.Another advantage of analyses based on isotope ratios in tree rings is that the physiological mechanisms controlling their variations are reasonably well understood,and are relatively simple compared with the numerous factors that control the annual growth increment.Most research on stable isotopes in tree rings has focused on the stable isotopes of carbon,because they are the easiest to measure and show the most rapid development.However,to date,there is no consensus on which component of tree rings best reflects the climatic and environmental changes in terms of the carbon isotope ratio（δ13C）.In this study,we investigated the differences in δ13C among different tissue components of tree rings.Two tree disks of Pinus sylvestris var.mongolica（SZX01-08 and BZ4-10-1.2） were sampled from forest on the north slope of Yilehuli Mountain,Greater Khingan（approx.51°57′—52°00′N,124°13′—124°36′E）.This site is located in the exclusive cool temperature zone of China that is dominated by coniferous forest vegetation.Tree-ring samples of earlywood（EW） and latewood（LW） were obtained with different sculpturing and pooling programs to avoid interference from non-uniform aspect distributions,i.e.both samples were sculptured for no less than two aspects（E＋S＋W for SZX01-08 and ENE＋W for BZ4-10-1.2）.Based on measurement of ring widths and cross-dating,the periods analyzed were the maximum growth periods;AD1904—1908/1924—1928/1944—1948 for SZX01-08 and AD1930—1944 for BZ4-10-1.2,according to polynomial fitting of ring-width sequences.The holocellulose and α-cell

关 键 词：树轮 碳同位素 气候变化 纤维素 材质 樟子松 

分 类 号：S791.253[农业科学—林木遗传育种]