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[摘要]
树木生长轮记录了植物生长期的气候环境信息及其生理响应过程, 而这些信息可以通过定量分析生长轮的解剖学特征获得, 因此生长轮的定量分析被广泛应用于林学、地理学、古气候学和古生物学等研究领域。我国虽然保存了丰富的木化石, 但前人多从系统分类学角度研究木化石, 而较少利用木化石生长轮定量分析方法开展古气候环境的研究。本文主要结合松柏类木化石生长轮定量研究的案例, 对生长轮定量研究的主要方法和常用参数进行了系统比较和讨论, 包括: 生长轮宽度(Growth-ring Width)、年敏感度(Annual Sensitivity)、平均敏感度(Mean Sen-sitivity)、生长轮显著度指数(Ring Markedness Index)、晚材率(Percentage Latewood)、细胞减小率(Percentage Diminution)、脆弱性指数(Vulnerability Index)、中生形态指数(Mesomorphy Index)、生长轮类型的划分以及细胞直径与直径平均值差值的累计代数和(cumulative algebraic sum of each cell's deviation from the mean of the radial diameters, CSDM)。生长轮定量研究的参数和方法在松柏类木化石中的应用, 不仅有助于深入了解地质历史时期古气候环境信息, 而且在树叶寿命推算方面也有重要应用潜力。因此, 松柏类木化石生长轮的定量研究在揭示古气候、古环境和古物候学方面具有不可替代的独特优势。
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[Abstract]
Trees faithfully record the physiological responses to climatic and environmental changes during their life spans, which can be obtained by using quantitative analysis of the anatomical characteristics of growth rings. Thus, quanti-tative analysis of growth rings is widely used in modern forestry, geography, palaeoclimatology and palaeontology. In this paper, we systematically compared different parameters and methods of quantitative analysis of growth rings, in-cluding the identification of Growth Ring Type, Growth-ring Width, Annual Sensitivity, Mean Sensitivity, Ring Markedness Index, Percentage Latewood, Percentage Diminution, Vulnerability Index, Mesomorphy Index, and the cumulative algebraic sum of each cell's deviation from the mean of the radial diameters (CSDM). The application of these parameters and methods on fossil conifer wood not only provides an unique opportunity to assess the leaf lon-gevity and phenology of ancient conifer plants, but also provides comprehensive understandings of the palaeoenvi-ronmental and palaeoclimatic conditions during the geological past. Therefore, quantitative analysis of growth rings has irreplaceable advantages in the study of fossil conifer wood.
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