广东阳春现代樟树树轮宽度变化及其对气候因子的响应  

Response of contemporary tree ring width of Cinnamomum camphora to climate change in Yangchun, Guangdong Province

作　　者：邢秋茹[1] 刘鸿雁[1] 孙艳荣[2] 崔海亭[1] 戴君虎[3] 李平日[4] 谭惠忠[4] 

机构地区：[1]北京大学环境学院生态学系,北京100871 [2]北京大学物理学院,北京100871 [3]中国科学院地理科学与资源研究所,北京100101 [4]广州地理研究所,广州510070

出　　处：《生态学报》2004年第9期2077-2080,共4页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目 ( 4 0 0 710 82 )~~

摘　　要：树木年轮方法定年准确、连续性强、分辨率高和易于获取复本等 ,成为全球气候变化研究的重要手段之一。在热带、亚热带地区 ,受树木生理特性的影响 ,树轮研究工作开展较少。通过广东阳春过渡热带现代樟树树木年轮宽度的变化 ,发现秋季降水是影响研究区樟树生长的重要因子。树轮记录的准 4～ 4 .92 a周期的树轮指数变化可能与厄尔尼诺的周期有关 ,即厄尔尼诺引起气候变化对树木生长产生影响。尽管樟树生长快 ,树轮不清晰 ,交叉定年困难 ,但由于研究区存在明显的旱季 ,樟树树轮仍然能够在一定程度上反映气候条件的影响。Dendroclimatological approach is significant in global climatic changes for its precise dating, high continuity, high resolution and easily obtained duplicates. Only a few dendroclimatological works have been conducted in tropical and subtropical zone due to relative low seasonality there. Yangchun in Guangdong province was selected for the study area of this paper. It is located at the transitional zone between southern subtropical zone to northern tropical zone climatically. Strongly affected by the tropical monsoon, the climate is a humid oceanic one. Relationships between tree-ring chronology of Cinnamomum camphora trees and climatic indexes were investigated in this area. With increment borer, 71 tree-ring cores from 39 trees were collected in the study area. 35 of them were used for tree-ring width studies where 4 for carbon isotope analysis. Measurement of tree-ring width was conducted by LINTAB tree-ring width equipment with TSAP software package developed by Frank Ring company in Germany. Resolution of measurement is 0.01mm. The oldest sample reached 44 years. It is difficult to make a cross-dating for some of the samples, even for two rings from the same tree sometimes. Tree-ring series with high uncertainty in cross-dating were ignored. The selected series all demonstrated an exponential growth trend, therefore, exponential function was chosen for a detrending of growth. RES tree-ring chronology of EW oriented cores was then established. With regression between tree-ring width chronology and climatic indexes, it is found that precipitation in autumn is critical to the growth of Cinnamomum camphora in the study area. The 4～4.92 years of periodicity in tree-ring width index is possibly associated with El Nino, which affect tree growth through climatic changes. It is also demonstrated that tree-ring width of Cinnamonum comphora do indicate climatic changes due to an obvious drought season in the study area, although cross-dating is difficult due to its rapid growth and unclear tree rings.

关 键 词：树木年轮 过渡热带 香樟(Cinnamonum camphora) 气候变化 厄尔尼诺 

分 类 号：S718.4[农业科学—林学]