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一、前言 1971年,在湖北宜昌葛洲坝附近兴修水利工程中,发现了埋于长江江底沙石层下的古树层。本文研究的古重阳木是江底沙石层下古树层中较完整的一株树木。出土时尚有较完整的树根形态与第一枝椏痕迹,仅树干表面炭化龟裂,内部材质较完好,是世界上木材天然保存极为罕见的发现,经碳14同位素测定距今已有6570±110年。 今、古重阳木化学成份比较分析的结果已证明古木在乏气条件下半纤维素首先分解,损失较多;纤维素含量下降不多,而木质素最稳定。
I. Introduction In 1971, an ancient tree layer buried beneath the gravel layer of the Yangtze River was discovered in the water conservancy project in the vicinity of the Gezhouba Dam in Yichang, Hubei Province. The ancient Chongyang wood studied in this paper is a more complete tree in the ancient tree layer under the sand bed at the bottom of the river. Unearthed fashion has a more complete root morphology and traces of the first branch, only the surface of the trunk charring cracks, the internal material is intact, is the world’s natural preservation of wood is extremely rare found by carbon 14 isotope dating dating from 6570 ± 110 year. Today, the results of the comparative analysis of the chemical components of ancient Chongyang wood have proved that the ancient wood under the conditions of gas depleted first decomposed, loss more; less cellulose content, while the lignin is the most stable.