树木年轮与气候变化关系研究

综述树木年轮分析在温度、降水序列和大气CO2浓度变化研究中的应用概况,着重探讨气候变化对树轮宽度、密度和稳定同位素组成的影响,如温度、降水对树木生长的"滞后效应"、"幼龄效应",并就树轮年代学在气候变化研究中存在的问题和研究前景作简要探讨,提出今后年轮气候学的研究应结合中、小时间尺度的树木生理生态学特性进行,需阐明树木和环境各因子之间的相互作用机理及量化关系,应加强各类代用资料与仪器观测记录结果的对比分析,并加强对年轮气候模型的验证,研究方法应由经验性分析转向机理性研究,并注重多学科知识的综合运用.

Study on Relationship between Tree-Ring and Climatic Change

Tree growth is strongly influenced by environment and climatic variables. This paper reviewed the advances and applications of tree-ring width, density and stable isotopic compositions on reconstructing the sequences of temperature and precipitation as well as atmospheric CO_2 concentration changes. The impacts of climatic change on tree-ring width, density and stable isotopic compositions, such as hysteresis effect and junior effect were analyzed. In addition, the existing questions and future trends of dendrochronology in climatic change were also briefly discussed. In future, on the basis of tree physio_ecological characteristics, dendrochronology should clarify the interaction mechanisms and quantitative relations between tree-ring and environmental variables on medium or small time-scales. The comparative analysis between the observation record and other substitutive data must be especially improved, accordingly, the validation of tree-ring-climate model must be strengthened. The study method should transit from empirical analysis to mechanism study, and interdisciplinary and integrated application should be more emphasized.