【作者】 李大辉； 艾铁民；

【Author】 Li Dahui, Ai Tiemin (School of Pharmaceutical Sciences, Peking University, Beijing 100083)

【机构】 北京大学药学院；

【摘要】 目的评述“树皮年轮”的概念及其应用于判断树龄的科学性。方法在广泛查阅相关文献资料的基础上,对“树皮年轮”的概念及其在判断树龄方面应用的科学性问题进行了综合分析。结果虽然韧皮部纤维存在分层排列的现象,但是不能称其为“年轮”。因为呈带状排列的纤维束的数目,在每个生长季节不总是固定的,有的甚至缺乏韧皮部纤维。并且次生韧皮部在次生生长过程中的数量有限,还会随着树皮逐渐的剥落。结论因此认为“树皮年轮”的提法缺乏科学性, 也不能作为判断树龄的依据。更多还原

【Abstract】 Objective To scientifically query the concept of "annual rings in tree bark" and their applications for age decision of trees. Methods The references related to the annual rings in tree bark were searched, reviewed and analyzed. Results The phloem fibers of some woods do exist in layer by layer, but they can not be named as "annual rings". The number of these fiber layers produced by cambium is not always constant during each growth season, and they may be absent in other ones. Moreover the quantity of the secondary phloem originated from the secondary growth is limited, and parts of the phloem itself would gradually peel off within barks. Conclusion It is reasoned that the concept of "annual rings in tree bark" is not scientific, and devoid of practical value of application to deciding the age of trees.更多还原