五个中国特有针叶树种树轮宽度对气候变化的敏感性  

A preliminary study on the tree-ring sensitivity to climate change of five endemic conifer species in China

作　　者：吴普[1] 王丽丽[1] 黄磊[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101

出　　处：《地理研究》2006年第1期43-52,共10页Geographical Research

基　　金：国家自然科学基金项目(30270227和90102005);中国科学院知识创新项目(KZCX3-SW-321和KZCX1-10-02)

摘　　要：本文对采自四川西部的鳞皮冷杉、铁杉、红豆杉、高山松和青海东部的青海云杉等5个中国特有针叶树种树轮宽度对气候变化的敏感性进行了研究。这五5个针叶树种的年轮纹印清晰,伪年轮和丢年轮较少(麦秀云杉0.247%,飞水崖红豆杉0.202%),便于确定年代和量测宽度,用COFECHA程序对定年结果进行检验,证明交叉定年的结果是可靠的。统计分析结果显示,这5个中国特有种差值年表包含丰富的气候信息。相关分析显示,树轮宽度数据和气象数据有着显著的相关关系。5个树种对气候因子较为敏感的响应表明,它们是适于进行树轮气候学分析的树种;在树轮气候学的研究中具有很大的潜力和应用前景。About 214 trees in 9 sampling sites, representing 5 endemic conifer species, were collected from the western Sichuan province and eastern Qinghai province, China. In this study, we try to investigate tree-ring sensitivity to climate change in order to reconstruct past climate from this region. All the 5 species present distinct ring boundaries with few ABS（absent rings） and are available for cross-dating. They all passed the test by program COFECHA. Statistics for all the 8 residual chronologies also exhibit significant inter-correlation between series and high values of mean sensitivity. These results indicate the usefulness of these chronologies for dendrochronological studies. Pearson correlation analyses were applied to provide a basic estimate of the causal relationships between tree-ring width and climate factors. We found some significant relationships between tree-ring width and temperature as well as precipitation. Regardless of tree species, chronologies in the study area presented accordant variations of which may reveal strong common climate signal. Thus these chronologies are shown to be dependable for building tree-ring network in the near future. However, there was limitation in this study, only monthly mean of temperature and precipitation were available. Also, for this typical subtropical mountain system, meteorological stations are usually located in valleys and biased to represent moisture conditions on the slopes. Thus the estimation of precipitation both in temporal and spatial domain was rather restricted. Further studies, such as wood anatomy, physiology and densitometry, are needed for better understanding the environmental and climatic history in this area.

关 键 词：川西 青海东部 特有针叶树种 树轮宽度 气候变化 敏感性 

分 类 号：P464[天文地球—大气科学及气象学]