Basic study on overhauled and removed building materials

我们确认，奈良甘果寺的一些屋顶瓦片肯定是从明日香的前阿须卡德拉寺庙移来的，因为它们具有粘土和瓷砖颜色等材料和制造工艺的共同特征。通过研究，确定了四组木质部件。最古老的年轮被认为是在6世纪末被砍伐的；其中一个年轮显示它被砍伐了大约公元588年，外加几年。由于日本正木提到的阿修卡德拉寺庙始建于公元588年，木材在公元590年被砍伐，年表中提到的年份与用树轮测得的结果非常一致。第二组属于公元7世纪中后期，而关于阿修卡德拉寺庙的过去研究表明，寺庙是在修复期间进行的。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。最早建立在明月寺庙的建筑是在白镐时代前后修复的，并于8世纪迁至奈良。其余两组透露，寺庙在平安和镰仓时期一直得到修复，但没有提到这方面的历史记录。预计将对屋顶瓦片进行进一步的详细研究。我们希望这种研究方法得到广泛应用，因为这对其他寺庙澄清其不为人知的修缮历史也是有用的。

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.