国立研究開発法人 国際農林水産業研究センター | JIRCAS

Flood Event Loadings of Nitrogen and Phosphorus from the Yahagi River to Chita Bay, Japan

JARQ : Japan Agricultural Research Quarterly
ISSN
00213551
書誌レコードID(総合目録DB)
AA0068709X
本文フルテキスト

A 4-year data set of continuous monitoring of suspended matter and nutrients concentration has been analyzed to evaluate the inter-annual variability and the effects of flood events on the sediment transport and nitrogen, phosphorus loadings from the Yahagi River to Chita Bay, Japan. Nitrogen was mainly loaded in dissolved form, which accounted for 59% to 88% of the annual loads, while phosphorus was mainly loaded in particulate form (45% to 78%). Loads of suspended matter and total phosphorus (T-P) by the historical flood event of the Tokai Heavy Rainfall accounted for 83% and 65% of the annual loads, respectively. Particulate phosphorus (PP) load by the Tokai Heavy Rainfall accounted for up to 1.1 to 3.2 times of the annual T-P load of the other years. Molar ratio of dissolved total nitrogen (DTN) load to dissolved total phosphorus (DTP) load during the observation period varied from 29.5 to 41.1, while the ratio of total nitrogen (T-N) load to T-P load was relatively lower (10.9 to 23.8). The concentrated load of suspended matter which occurs during flood events is found to have a great impact on the nutrients runoff to the coastal sea both in quality and quantity.

刊行年月2009-01-01
作成者TANAKA KatsuhisaKODAMA MasashiSAWADA TomokiTSUZUKI MotoiYAMAMOTO YujiYANAGISAWA Toyoshige
著者キーワード

long-term monitoring

nutrients

suspended matter

Tokai Heavy Rainfall

公開者Japan International Research Center for Agricultural Sciences
データ作成日2009-01-01
国立情報学研究所メタデータ主題語彙集(資源タイプ)Journal Article
43
1
開始ページ55
終了ページ61
DOI10.6090/jarq.43.55
権利Japan International Research Center for Agricultural Sciences
言語eng