{"created":"2022-01-28T04:38:49.584184+00:00","id":2007971,"links":{},"metadata":{"_buckets":{"deposit":"5b10bfda-6bc3-438b-a0ce-c298fce5be40"},"_deposit":{"id":"2007971","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2007971"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02007971","sets":["1642837622505:1642837905044:1642837928660","1642838403551:1642838407312"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"\u6c96\u7e04\u770c\u306b\u304a\u3051\u308b\u30d5\u30af\u30ae\u306e\u6a39\u9f62\u63a8\u5b9a\u306b\u95a2\u3059\u308b\u8abf\u67fb\u7814\u7a76","subitem_1551255648112":"ja"},{"subitem_1551255647225":"Age Estimation of Fukugi Trees in Okinawa Prefecture","subitem_1551255648112":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"\u4ef2\u9593, \u52c7\u6804","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"\u67f4\u7530, \u660c\u548c","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"\u9673, \u78a7\u971e","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"Nakama, Yuei","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Shibata, Masakazu","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Chen, Bixia","creatorNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_1522299639480":"open access","subitem_1600958577026":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"estimated age of Fukugi trees"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"calculation method"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"[Remark 1] environmental factors"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"The tree age estimation formula developed by Hirata (2006) is not suitable for all regions in Okinawa Prefecture because its calculation was based on a small number of samples from only a few areas. This study aimed to revise the Hirata method by considering environmental factors. Samples for analysis were collected from a wide range of areas in Okinawa Prefecture. Following this, the growth rings were counted in samples and compared with the results obtained using the Hirata method. In total, 14 samples were collected from Mainland Okinawa, Tarama Island in Miyako Island City, and Ibaruma in Ishigaki City. In the present study, two methods were developed to determine the age of Fukugi trees grown in a general environment: 1) Estimated age (year) = [3.4908 x diameter (cm) at the height of 20-30 cm above ground level] - 11.538 2) Estimated age (year) = [diameter (cm) at the height of 20-30 cm above ground level] )/2 x 6.2 The age estimate using the Hirata method by multiplying the diameter at 20-30 cm above ground level instead of multiplying the diameter at breast height is applicable to trees with a diameter lesser than 10 cm or greater than 70 cm. Therefore, it showed approximately 10-year error. However, the deviation from the calculation result using the Hirata method is large for trees with a diameter ranging from 10-70 cm measured at 20-30 cm above ground level. This error in the age estimate is attributed to the rapid growth rate in this age range. On average, approximately 6.2 growth rings were counted for every centimeter of a diameter. We obtained an average error of 9.2 years by calculating the estimated age according to the Hirata method by multiplying the radius (cm) at the height of 20-30 cm above ground level by 6.2. In particular, this exhibited a good fit for the samples with a diameter lesser than 40 cm. Therefore, we conclude that the second method can be applicable to estimate the tree age. From the variance of increment in growth rings among the three samples from Tarama Island in Miyako Island City, a Tarama-specific method was proposed as follows: 3) Estimated age (years) in Tarama Island = [6.317 x radius (cm) at the height of 20-30 cm above ground level] + 1.152 A correlation between the growth ring increments and annual precipitation was 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