{"_buckets": {"deposit": "dd66a656-5213-4e20-a5be-37c1b040b946"}, "_deposit": {"id": "19792", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "19792"}, "status": "published"}, "_oai": {"id": "oai:nagoya.repo.nii.ac.jp:00019792"}, "item_9_alternative_title_19": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u8a00\u8a9e\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Stability of soil organic carbon accumulated under long term use as rice paddy"}]}, "item_9_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2014-03", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "68", "bibliographicPageStart": "62", "bibliographicVolumeNumber": "25", "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": "The effect of long term use as a rice paddy field on the stability of soil organic C (SOC) was investigated using the plow layer soils collected from two series of rice fields distributed in Hangzhou Bay region, Zhejiang Province, China, which have the estimated periods of time under irrigated rice paddy ranging from 5 to 2000 years. Amount, C and N stable isotopic ratios (\u03b413C and \u03b415N), and 14C age were compared mainly for the silt/clay sized fractions of soils and their humin as representative soil organic matter (SOM) fractions with a relatively long residence times due possibly to the adsorption to clay minerals and insolubility in water. The degree of humification of humic acids in silt/clay was also determined. Total C and humin C in the silt/clay fraction increased with increasing estimated period under rice paddy up to 2000 years. The degree of humification of humic acids increased during the first 100 years, but did not change afterward, suggesting that the structural change to refractory substances was not responsible for the enhanced SOC accumulation. A gradual decrease in \u03b415N suggested the increase in the contribution of organic N fixed recently or derived from fertilizer to total silt/clay N and humin. The 14C age of humin became younger with increasing estimated period under rice paddy, which suggested that the larger SOC in the soils used as rice paddy field for a longer time was owing to the enhanced accumulation of organic C recently assimilated. 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