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贝壳年轮学通过研究水生生物骨骼的周期性增长,来解译其生命历史及记录的环境信息。介绍了贝壳年轮研究的对象和方法、回顾了贝壳年轮的发展历程,并以渤海湾地区的现生和埋藏牡蛎壳体为例进行了贝壳年轮与壳体同位素剖面分析研究,首次同时关注牡蛎壳体剖面内的生长层和壳体韧带槽表面的特征层,二者共同指示了准确的生长年轮。结果显示,对应于壳体韧带槽表面凹沟的壳体剖面内灰色半透明生长层,具有一个年生长周期内最重的氧同位素比值,是晚秋至早春季节水温较低、食物来源匮乏时期形成的缓慢致密生长层;对应于壳体韧带槽表面外凸层中部的壳体剖面内灰色半透明生长层,具有较轻的氧同位素比值,是春季牡蛎产卵而形成的缓慢致密生长层;二者均具有良好的季节性指示意义,可以根据这些特征生长层对壳体的生长年龄进行准确的判断。
Seashells learn to interpret the history of their lives and recorded environmental information by studying the cyclical growth of aquatic bones. The objects and methods of shell research are introduced. The development history of shell ring is reviewed. Taking the present life and burial oyster shell of Bohai Bay as an example, the analysis of shell ring and shell isotope profile is carried out. For the first time, Focus on the growth layer in the oyster shell profile and the characteristic layer on the surface of the ligament of the shell, both of which together indicate an accurate growth ring. The results show that the gray translucent growth layer in the cross-section of the shell corresponding to the groove on the surface of the ligament of the shell has the heaviest oxygen isotope ratio in one annual growth cycle, which is the result of the low water temperature from late autumn to early spring and the lack of food source Of the slow and dense growth layer; corresponding to the middle of the outer shell of the ligament groove shell shell translucent gray translucent layer, with a lighter oxygen isotope ratio, is the spring oyster spawning and the formation of slow dense growth layer; Who have a good seasonal indication of significance, according to these characteristics of the growth layer of the shell to determine the exact age of growth.