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The Basic model for aquatic ecosystem assessment using carbon and nitrogen stable isotopes

碳氮稳定同位素水生生态系统评估基本模型

基本信息

批准号：
18510023
负责人：
YAMADA Yoshihiro
金额：
$ 2.62万
依托单位：
Kagawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18510023/
关键词：
Stable Isotope Ratio Water pollution Ecosystem Environmental Assessment Nitrogen 環境分析アセスメント

项目摘要

In the Yoshino River, The Total-N concentration were from 0.19 to 0.55mg/l in the top to middle reaches, which most in the catchment is a forest, in the lower reach, where population and farmland increased, the concentration rose from 0.58 to 1.19mg/l. δ^<15>N value of Total-N were 1.0% in the head water, 3.6-5.9%0 in the middle reach, and 4.2-8.9%0 in the lower reach. There was positive correlation (r=0.91, p<0.001) between the δ^<15>N_<Total-N> and Total-N concentration. The increase in the δ^<15>N_<Total-N> and Total-N concentration with the increase in the farmland and population in the catchment indicated that the effect of the nitrogen loading by agricultural and life drainage was large as a downstream.The relation between the δ^<15>N_<Total-N> and Total-N concentration in 10 main river flowed into Lake Biwa was similar to the relation got in the Yoshino Rivet However, about 8% was the maximal value, the δ^<15>N_<Total-N> decreased in the river in the paddy field region. In such river, the ammonia concentration was high. It was indicated that the δ^<15>N_<Total-N> decreased in the anaerobic environment because nitrification is not sufficiently carried out. The fluctuation of such δ^<15>N shows δ^<15>N is the good parameter to reflects the effect of nitrogen loading by the human activity. It is possible to make use of The δ^<15>N_<Total-N> for the diagnosis of the aquatic environment.From the investigation of the Yoshino River, the relation of δ^<15>N_<Total-N> (%o)=3.7×Total-N concentration(mg/1)-0.30 was obtained. and it becomes a standard in considering the soundness of the river in future. In the future, such relational expression will become a standard of the assessment of the waters ecosystem. In the future, such relational expression will become a standard to diagnose the health of the aquatic ecosystem.

在吉野川流域，总氮浓度在上中游为0.19 ~ 0.55mg/l，流域内多为森林，而在下游，随着人口和耕地的增加，总氮浓度从0.58上升到1.19mg/l。总<15>氮的δ^ N值在上游为1.0%，中游为3.6-5.9%0，下游为4.2-8.9%0。δ^ N与全氮浓度呈显著正相关（r=0.91，p<0.001）<15><Total-N>。δ^<15>N<Total-N>和Total-N浓度随流域内农田和人口的增加而增加，说明下游地区农业和生活排水对氮负荷的影响较大，入湖<15><Total-N>的10条主要河流的δ^ N和Total-N浓度的关系与吉野铆钉的关系相似，但在稻田区河流中δ^ N浓度最大，约为8%<15><Total-N>。在这样的河流，氨浓度高。结果表明，<15><Total-N>在厌氧环境中，由于硝化作用不能充分进行，δ^ N_3降低。δ^ N的波动<15>表明δ^<15>N是反映人类活动氮负荷影响的较好参数。通过<15><Total-N>对吉野川的调查，得到了δ^<15>N_<Total-N>（%o）=3.7×总氮浓度（mg/l）-0.30的关系式。并成为日后考虑河流是否健全的标准。在未来，这种关系式将成为评价沃茨生态系统的一个标准。在未来，这种关系的表达将成为诊断水生态系统健康的标准。