琵琶湖における水質変動 : II、南湖表層水におけるCOD, SS, リン, 窒素およびクロロフィルaの季節変化
スポンサーリンク
概要
- 論文の詳細を見る
Chemical components in the surface water were surveyed monthly from April, 1981 to January, 1983 in and around the dredged area of the southern basin of Lake Biwa. COD(T), SS and total phosphorus increased according to the growth of phytoplankton, as indicated by the increase of chlorophyll aconcentration during the period late summer-autumn. During this time the total nitrogen concentration remained almost constant. Particulate COD, obtained as the difference between total COD and COD(F)in the filteredsample, and presumably due to phytoplankton, reached 65% of total COD in September, 1981, when the largest total COD was recorded. The regression line was obtained between the concentrations of particulate phosphorus and chlorophyll a, passed through the origin with a slope of 1(w/w). The concentration of soluble reactive phosphorus(SRP) in the lake water was very low throughout the year, but was hiqher in the rivers flowing into the lake. The reason for the low concentration of SRP in the lake water could be that phosphate, the greater part of SRP, was incorporated into growing phytoplankton during the period summer-autumn and was therefore present as particulate phosphorus, while in winter, most of thephosphate was precipitated by inorganic reactions such as adsorption onto clay minerals and ferric hydroxide. Seasonal changes of total nitrogen were small but there was substantial conversion between dissolved inorganic(DIN), dissolved organic and particulate forms. Disappearance of DIN in the summer season may to suggest a limitation by DIN to the growth of phytoplankton, provided that the availability of phosphorus inside the cells of the phytoplankton is sufficient for growth.
- 滋賀大学教育学部の論文
- 1983-00-00
滋賀大学教育学部 | 論文
- 高等部自閉症生徒への携帯電話Webサイト活用による相互コミュニケーションの可能性に関する障害特性からの理論的考察
- 逆向マスキングにおける視覚情報処理過程の発達的変化
- 時間離散的な伝染病モデルの大域的ダイナミクス
- 効率と公正を学ぶための経済教育
- 近代国家と大学の改革 : バイエルンの場合