松柏类木化石生长轮的定量研究方法与应用

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...

Quantitative analysis of growth rings and their applications on fossil conifer wood

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.