Basic study on overhauled and removed building materials

我们认识到奈良的gano -ji寺的一些屋顶瓦片肯定是从原明日香的明日寺搬来的，因为它们具有粘土和瓦片颜色等材料和制造技术的共同特征。关于木制部件，通过研究按时间顺序确定了四组。最古老的被认为是在6世纪后期切割的；其中一个年轮表明它大约是在公元588年加上几年被砍伐的。《日本书报》的年表中提到，旭光寺是在公元588年开始建造的，木材是在公元590年被砍伐的，因此年表中提到的年份和利用树木年轮测定年代的结果是一致的。第二组是根据过去对旭光寺的研究，从7世纪中后期开始修复寺庙的时期。屋顶瓦片的特点也证明了这一点，因为它们中的许多都是同一时期的。最初建立在旭光寺的建筑在白穗时期前后得到修复，并于8世纪迁至奈良。另外，两组调查结果显示，虽然没有史料记载，但在平安时代和镰仓时代，一直在进行修缮。预计将对屋顶瓦片进行进一步的详细研究。我们希望这一研究方法得到广泛应用，对其他寺庙澄清其不为人知的修复历史也有帮助。

We recognized that some roof tiles of Gango-ji temple in Nara had been certainly moved from former Asukadera temple in Asuka because they have the common character of materials and manufacturing techniques such as the clay and the color of tile.Concerning wooden parts, four groups were chronologically determined through the study. The oldest ones are considered to be cut around the late 6th century ; one of the annual rings show that it is cut down about A.D. 588 plus several years. Since a chronology NIHON SHOKI mentioned the Asukadera temple was begun to build in A.D. 588 and the wood was cut down in A.D. 590, the year mentioned in the chronology and the result measured by the dating method using tree rings was well agreed.The second group belongs to the period from the middle to late 7th century while the temple was repaired as the past research about Asukadera temple suggested. The characteristics of roof tiles also prove this as many of them are of the same period. Buildings firstly established in Asukadera temple were repaired around Hakuho period and moved to Nara in the 8th century.The rest, two groups revealed that the temple had been continuously repaired during Heian and Kamakura period though there was no historical record mentioned about that. Further detailed study concerning the roof tiles will be expected. We hope wide application of this method of research, as this is also useful for other temples to clarify its unknown history of repairs.