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.

在吉诺河中，在上游到中河的总N浓度从0.19至0.55mg/l，在流域中，大多数是森林，在下游，人口和农田增加，浓度从0.58升至1.19mg/l。总n的δ^<15>在头部水中为1.0％，中间覆盖范围为3.6-5.9％0，下到达中的Δ^<15> n值为4.2-8.9％0。 δ^<15> n_ <总计n>和总n浓度之间存在正相关（r = 0.91，p <0.001）。随着流域中农田和人口的增加，δ^<15> n_ <15> n_ <总计和总n浓度的增加表明，农业和生命排水所承受的氮载荷的影响很大，因为下游的关系是δ^^^<15> n_ <15> n_ <<15> n_ <<15> n_ <<15> n_ <<15> n_ <<15> n_ <<总体N>和总浓度之间的最大浓度与8％的关系相似，与Biwa湖相似，相似的是，与Bie的关系相似，这是相似的。值，在稻田区域的河流中，δ^<15> n_ <总计降低。在这样的河流中，氨浓度很高。据表明，由于硝化作用不够充分，δ^<15> n_ <总计降低了。这种δ^<15> n的波动是反映人类活动氮荷载作用的好参数。可以利用δ^<15> n_ <tater-n>进行水生环境的诊断。从Yoshino河的投资，获得Δ^^^<15> n_ <tater-n>（％o）= 3.7×总n浓度（MG/1）-0.30的关系。它成为考虑将来河流的稳健性的标准。将来，这种关系表达将成为评估水生态系统的标准。将来，这种关系表达将成为诊断水生生态系统健康状况的标准。