Studies on Nitrogen Pollution of the Tamagawa-river system.

玉川水系氮污染研究。

• 批准号: 08456041
• 负责人: KUMAZAWA Kikuo
• 金额: $ 3.65万
• 依托单位: Tokyo University of Agriculuture
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08456041/
• 关键词: delta^<15>N; Denitrification; Nitrate; Nitrogen Pollution; Spring Water; Tamagawa-river; 浅川; 南浅川; 野川; 仙川; 秋川; 窒素安定同位体; 浄化作用

The sources of nitrogen pollution of the Tamagawa-river system were studied with the Nitrogen Isotope ratio (delta ^<15>N) method. The results are follows :1) NO_3-N concentrations anti delta^<15>N values of Hiraigawa-river were high 2.26*10.3mgL^<-1> and 8.73*10.7*, respectively. NO_3-N concentration (0.61mgL^<-1>) and delta^<15>N value (-0.20*) in the upstream water of Akikawa-river were the same as those of rainfall. Those of downstream water were 1.38mgL^<-1> and +5.44*, respectively, by the inflow of the nitrate polluted stream from the cultivated land. NO_3-N concentrations and delta^<15>N values of spring waters beneath the cliff of Akitome plateau were high (8.98*9.28mgL^<-1> and +7.95*+8.75*), reflecting the farming activities, particularly livestock rasing.2) The concentrations of NO_3-N of waters collected from the upstream of Asakawa-river up to point beyond the confluence of Asakawa and Minami Asakawa-river showed a gradual increase from 1.16 to 4.42mgL^<-1>. NH_4-N and NO … More _2-N were also detected in waters from the junction of Asakawa and Minami Asakawa-river and beyond it. This is due to the increasing the human waste within the vicinity of Minami Asakawa-river.3) NO_3-N concentrations and delta^<15>N values of the springs water from the human activity which are the sources of Nogawa-river, were 4.50*6.48mgl^<-1> and +4.67*+5.34*, respectively. However, proceeding downstream, there was a decrease in the NO_3-N concentration and an increase in the delta^<15>N value, suggesting a natural purification and denitrification during the flow within this river. At the confluence of Nogawa-river and Senkawa-river, the NO_3-N concentration and delta^<15>N value markedly increased to 6.40mgL^<-1> and +11.7*, respectively.4) It is considered that the sources of nitrate of spring waters in the right side of the upper and central part of Tamagawa-river are coming from soil and human activities. The decrease of NO_3-N concentration and increase of delta^<15>N value in spring waters on the left side of the central part of the Tamagawa-river are due to the presence of reed plants. Less

采用氮同位素比(δ^15N)法研究了玉川河水系的氮污染源。结果如下：1)平井川河NO_3-N浓度抗δ^15N值较高，分别为2.26*10.3mgL^-1和8.73*10.7*。秋川河上游水体中NO_3-N浓度(0.61mgL^-1>)和δ^15N值(-0.20*)与降雨量相同。由耕地流入的硝酸盐污染河水，下游水体分别为1.38mgL^-1和+5.44*。秋留高原悬崖下泉水的NO_3-N浓度和delta^<15>N值较高(8.98*9.28mgL^<-1>和+7.95*+8.75*)，反映了农业活动，特别是牲畜饲养。 2)从浅川河上游至河川汇合处收集的水体中NO_3-N浓度 浅川河和南浅川河显示出从1.16到4.42mgL^-1的逐渐增加。浅川河与南浅川河交汇处及其以外的水域中也检测到了 NH_4-N 和 NO … More _2-N。这是由于南浅川河附近人类排泄物的增加所致。3)作为野川河源头的人类活动泉水的NO_3-N浓度和delta^15N值分别为4.50*6.48mgl^-1和+4.67*+5.34*。然而，继续下游，NO_3-N浓度降低，δ 15 N值增加，这表明在该河流内流动过程中存在自然净化和反硝化作用。野川河与仙川河交汇处NO_3-N浓度和δ^<15>N值显着升高，分别达到6.40mgL^<-1>和+11.7*。4)认为玉川上游和中部右侧泉水硝酸盐的来源主要来自于土壤和人类活动。玉川中部左侧泉水中NO_3-N浓度的降低和δ15N值的增加是由于芦苇植物的存在。较少的

项目成果

田村幸美・山本洋司・熊澤喜久雄: "窒素安定同位体比法を用いた多摩川の窒素汚染に関する研究 -南浅川の窒素汚染-" 東京農業大学農学集報. 43. 59-63 (1998)

Yukimi Tamura、Yoji Yamamoto、Kikuo Kumazawa：“利用氮稳定同位素比法研究多摩川氮污染-南浅川的氮污染-”东京农业大学农业通报43. 59-63 (1998)。

Yukimi Tamura, Yoji Yamamoto, Kikuo Kumazawa: "Studies on Nitrogen Pollution in Tamagawa River through delta^<15>N Techniqe-Nitrogen Pollution in South Asakawa River-" J.of Agricultural Science, Tokyo Nogyo Daigaku. 43(2). 59-63 (1998)

Yukimi Tamura、Yoji Yamamoto、Kikuo Kumazawa：“通过三角洲的玉川河氮污染研究^<15>N技术-南浅川河的氮污染-”农业科学杂志，东京农行大学。