{"_buckets": {"deposit": "e530e69d-6f48-4f44-8b0d-cdafbc5f5016"}, "_deposit": {"id": "11709", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "11709"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00011709"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "A palynological study of alas sediments, central Yakutia, eastern Siberia(Summaries of Researches Using AMS)"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2003-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "140", "bibliographicPageStart": "130", "bibliographicVolumeNumber": "14", "bibliographic_titles": [{"bibliographic_title": "\u540d\u53e4\u5c4b\u5927\u5b66\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u696d\u7e3e\u5831\u544a\u66f8"}]}]}, "item_9_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "A larges number of thermokarst depressions, i.e. alasses, are exists in Central Yakutia, eastern Siberia. Alasses were formed by thermal disturbance of ice complex in ground, for example, rising air temperature or destruction of vegetation. Once alas is formed, reforestation is difficult because of salt accumulation near ground surface. It is said that alasses in the Central Yakutia were developed during the Holocene Climatic Optimum. However, the chronology of alas formation and local vegetation change around alas are not well known. The reconstruction of alas formation history and past environmental changes around alas might be important for understanding climatic trends in future. Pollen analysis is useful for reconstruction of the past vegetation change. The objectives of this study are reconstruction of alas formation and vegetation history of central Yakutia by means of ^\u003c14\u003eC dating and pollen analysis. The study sites are four thermokarst lakes, Ulakhan Sykkhan alas (62\u00b0 08\u0027 57\" N, 130\u00b0 31\u0027 54\"E), Uinakh alas (62\u00b0 09\u0027 23\" N, 130\u00b0 38\u0027 35\"E), Ulumaaly alas and Lake Maralay (63\u00b0 06\u0027 43\" N, 130\u00b0 35\u0027 41\" E), middle terrace of right bank of the Lena River, central Yakutia. The vegetation in the Central Yakutia is boreal forest, where Larix dahurica with Pinus sylvestris is dominant. The border between forest and alas is occupied by Betula platyphylla. The vegetation of alas was dominant by Poaceae, Cyperaceae and Asteraceae etc. Samples from sediments were taken by shovel, and the deeper frost sediment was obtained with the boring machine. Each sample, which was divided into 1cm^3, was processed for pollen analysis according to standard methods. The sediments were subsampled at every 2 to 8cm intervals. At least 200 arboreal pollen grains were counted for each sample at 400\u00d7 magnification, except for low concentrated sample. Relative frequency was calculated based on the arboreal pollen number. Surface pollen analysis was also conducted, to assist the understanding between vegetation and pollen assemblage relationships. The results of ^\u003c14\u003eC dating at initiation of alas sediments were indicate as 7,975\u00b132, 8,285\u00b133 and 8,453\u00b133BP, which suggest that alasses in central Yakutia were developed around 8,000 BP. Surface pollen samples show that (1) Pinus and Picea pollen were transported by wind in long distance, (2) Larix and Betula pollen were reflected vegetation around alas, and (3) herb taxa indicate local presence of the source plants nearby. Vegetation reconstruction from four alas sediment shows that (1) Around 8,000BP the vegetation in the Central Yakutia is dominant of Betula-Larix forest with step elements such as Poaceae and Artemisia. (2) Between 8,000-5,000BP the maximum of Picea and Betula pollen were observed indicating the warm period. (3) Sharp increased Pinus pollen after 5,000BP indicates an expansion of Pinus sylvestris on sandy soils in the Central Yakutia.", "subitem_description_type": "Abstract"}]}, "item_9_description_5": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "\u30bf\u30f3\u30c7\u30c8\u30ed\u30f3\u52a0\u901f\u5668\u8cea\u91cf\u5206\u6790\u8a08\u696d\u7e3e\u5831\u544a Summaries of Researches Using AMS 2002 (\u5e73\u621014)\u5e74\u5ea6", "subitem_description_type": "Other"}]}, "item_9_identifier_registration": {"attribute_name": "ID\u767b\u9332", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.18999/sumrua.14.130", "subitem_identifier_reg_type": "JaLC"}]}, "item_9_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u540d\u53e4\u5c4b\u5927\u5b66\u5e74\u4ee3\u6e2c\u5b9a\u8cc7\u6599\u7814\u7a76\u30bb\u30f3\u30bf\u30fc"}]}, "item_9_relation_43": {"attribute_name": 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