{"created":"2023-06-19T09:17:17.444228+00:00","id":29913,"links":{},"metadata":{"_buckets":{"deposit":"dde70473-8669-4466-8865-ce4c27941e96"},"_deposit":{"created_by":1,"id":"29913","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"29913"},"status":"published"},"_oai":{"id":"oai:kumadai.repo.nii.ac.jp:00029913","sets":["399:444"]},"author_link":["147369","147367","147108","147370","147364","147368","147365","147366"],"item_16_alternative_title_22":{"attribute_name":"その他の言語のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Streamwater chemistry at the Sarukawa Experimental Watershed"}]},"item_16_alternative_title_23":{"attribute_name":"タイトル（ヨミ）","attribute_value_mlt":[{"subitem_alternative_title":"サルカワ シンリン リスイ シケン チ ニ オケル リュウシュツ スイ ノ 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characteristics. The Sarukawa Experimental Watershed, located in Miyazaki Prefecture, southwestern Japan, consists of three forested watersheds that experience high annual precipitation of more than 2500 mm. Most precipitation fell during the summer and autumn, resulting in seasonal variations in the runoff rate, which was high during the summer and autumn and low during the winter. Most solute concentrations in the streamwater also showed seasonal voriation, with a strong negative correlation with the runoff rate. The streamwater chemistry is thus influenced by variations in hydrological characteristics. Annual nutrient runoff rates of Na^+, Mg^2+, Ca^2+ and sulfur in the watersheds exceeded the annual atmospheric inputs observed at the Tano Station near the study watersheds, suggesting that most of these components are released from the soil and bedrock within the watershed by chemical weathering. On the other hand, annual nitrogen runoff rate at No.2 and No.3 watersheds from 1997 to 1999, and at No.1 watershed in 1997 and 1998, were lower than the annual atmospheric N input owing to retention by the plans within the watershed. However, at No.1 watershed in 1998, where annual precipitation reached 4375mm, the annual N runoff rate exceeded the annual atmospheric nitrogen input, although streamwater nitrate concentrations in 1999 were similar to those in 1997 and 1998. This phenomenon is likely to be caused by rapid nitrate leaching from surface soils during a storm event, indicating that hydrological processes strongly affect nutrient budgets, particularly the nitrogen budget, within the watershed.","subitem_description_type":"Other"},{"subitem_description":"温暖多雨地帯に位置する去川森林理水試験地の3試験流域において、1997年4月より2000年3月にかけて実施した流出水質の分析結果をもとに、日流出水量と流出水質との関係を明らかにした。去川森林理水試験地では日流出水量は夏期に多く、冬期に少ないという季節変動を示し、これに支配されて、多くの溶存成分濃度は夏期に低下し、冬期に上昇する季節変動を示した。さらに、去川森林理水試験地における年流出負荷量を近傍の田野における年流入負荷量と比較して溶存成分の収支を解析した。無機態窒素を除く多くの溶存成分の年流出負荷量は年流入負荷量を上回ることから、これらの溶存成分は流域内において土壌や岩石から風化によって生成され、流出していると考えられた。一方、無機態窒素はI号沢では1997年ならびに1998年に、II号沢ならびにIII号沢では3年間ともに年流入負荷量よりも年流出負荷量が少なく、植物による吸収・固定によって流域内に保持されていた。しかし、I号沢では年降水量が著しく多かった1999年にはNO_3-濃度は他の年と同等のレベルであったが、無機態窒素の年流出負荷量は年流入負荷量を超過した。これらのことから、去川森林理水試験地では平年には無機態窒素を流域内に保持する機能が働いているものの、平年を大きく上回る多雨の年には、土壌中のNO_3-の雨水による流出によって突発的な無機態窒素の年流出負荷量の増加が起こることが示唆された。","subitem_description_type":"Other"}]},"item_16_description_77":{"attribute_name":"URL","attribute_value_mlt":[{"subitem_description":"https://www.ffpri.affrc.go.jp/pubs/bulletin/420/index.html","subitem_description_type":"Other"}]},"item_16_publisher_36":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"国立研究開発法人森林研究・整備機構 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budge","subitem_subject_scheme":"Other"},{"subitem_subject":"去川森林理水試験地","subitem_subject_scheme":"Other"},{"subitem_subject":"流出水質","subitem_subject_scheme":"Other"},{"subitem_subject":"年流出負荷量","subitem_subject_scheme":"Other"},{"subitem_subject":"窒素収支","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal 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