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Study on stable isotope ratio of environmental pollutants behavior in agricultural ecosystem

农业生态系统环境污染物行为的稳定同位素比研究

基本信息

批准号：
04403022
负责人：
KUMAZAWA Kikuo
金额：
$ 17.86万
依托单位：
Tokyo University of Agriculture
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04403022/
关键词：
isotope ratio acid rain methane gas polyaromatic hydrocarbon pollutants nitrate ion sulfate ion δ^<34>S delta^<15>N1 delta^<34>S 地球環境温暖化ガス σN^<15>σS^<34>

项目摘要

Research on influence of pollutants from non agricultural field to agricultural production fields is a very important and urgent research theme. Also, many pollutants breakout from agricultural fields (methane, nitrate ion, etc.). Establishment of a elimination method of these pollutants is very important.Analysis technics of isotope ratio (^<15>N,^<34>S,^<18>O) was discussed and trained as research during the first year. Research sites were set up, collection of agricultural crops (rice, wheat, beans etc.), continuous under ground water sampling and ion components analysis of it, outbreak mechanisms of methane gas from paddy field and transportation process of acid precipitation (acid rain) were researched in the 2nd research year. More detail study on the 2nd year research subjects were done in the 3rd research year. Research abstracts are as follows : (1) Nitrate ion concentration was changeable with seasons, depending on how much of chemical fertilizers is used and composts for crop production and waste water from housing sites. (2) Methane outbreak from paddy field was inhibited with ferrous and ammonium sulfate. (3) Acid rain of Japan and main land China were collected and analyzed. Sulfate ion concentration was most high and sulfate ion and nitrate ion in the forest rain was recognized as having very high concentration. (4) Precipitation amount of polyaromatic hydrocarbons from the atmosphere depended on collection point and these amounts gradually decreased with distance from the generation point. Precipitation amount of polyaromatic hydrocarbon in the forest rain was higher than outside rain of forest.Practiced minuteness isotope ratio analysis is distinctively a very useful analysis method for tracing study of environmental chemical pollutants

研究非农业领域污染物对农业生产领域的影响是一个非常重要和紧迫的研究主题。此外，许多污染物从农田中释放出来（甲烷、硝酸根离子等）。建立这些污染物的消除方法非常重要。同位素比(^ 15 N、^ 34 S、^ 18 O)分析技术在第一年作为研究进行了讨论和培训。第二年设立研究场地，采集农作物（水稻、小麦、豆类等），进行地下水连续采样及其离子成分分析、稻田甲烷气体爆发机制及酸降水（酸雨）输送过程等研究。在第三研究年对第二年的研究课题进行了更详细的研究。研究摘要如下： (1)硝酸根离子浓度随季节变化，取决于化肥、农作物生产堆肥的使用量以及住宅区废水的使用量。 (2)用硫酸亚铁和硫酸铵抑制稻田甲烷爆发。 (3)对日本和中国大陆的酸雨进行了收集和分析。硫酸根离子浓度最高，森林雨中的硫酸根离子和硝酸根离子被认为具有很高的浓度。 (4) 大气中多环芳烃的降水量取决于收集点，并且随着距产生点的距离的增加，降水量逐渐减少。森林雨中多环芳烃的降水量高于森林外雨。实践中的精细同位素比值分析对于环境化学污染物的追踪研究是一种非常有用的分析方法。