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Studies on natural history of nutrient loading to forested wetland using stable isotope approach

使用稳定同位素方法研究森林湿地养分负荷的自然历史

基本信息

批准号：
13680636
负责人：
NOHARA Seiichi
金额：
$ 1.98万
依托单位：
National Institute for Environmental Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

The monitoring of Water pollution of river system was conducted in Kushiro mire from 1997 to 2003. From the investigation, it was estimated that the geomorphic change in Onnenaigawa River and Hororo river. Value and fluctuation of conductivity of Takkobu river was higher than other rivers. Concentration of phosphate and nitrous acid ammonia were low level in all rivers. There were characteristic of nitric acid in local, no change in seasonal. The high concentration of nitric acid (400-500ppb) was in above site of Horo River (K9) and the site of Onnenai River (K10). Water of K9 and K10 were mixing to lower site of Horo River (K11) that is low concentration of nitric acid. Kushiro mire was a sink of nitric acid. About half nitric acid was disappear from the mire river water.The pH of Lake Ozenuma was neutral from 6.3 to 7.5. On the other hand, the pH of stream water in the mire was acidic about 6 and the stream water of Nushiri area was specially low under 5 pH. Ooe rive which is moderate low pH such as 6.5 was the most large flow. The concentration of nitrate in the Ooe River was relatively high, nitrous acid and phosphate in the river was low level. Acidic stream water was usually low nutrient, mountain stream water was high nutrient revel. The nutrient in out flow such as water of Nushiri River and crib was low nutrient level. The nitrogen of stream water from mountain area to Lake Ozenuma was consumed in the lake. Water temperature of five streams was relatively lower than other stream. I suppose there are the springs of ground water in those streams.

1997~2003年在久路沼泽进行了水系水污染监测。通过调查，估计了Onnenaigawa河和Hororo河的地貌变化。塔科布河的电导率值和波动率均高于其他河流。所有河流的磷酸盐和亚硝酸氨浓度均较低。局部有硝酸特征，季节无变化。硝酸浓度较高(400-500 ppb)出现在霍洛河(K9)和昂内奈河(K10)以上。K9和K10的水混合到霍洛河下游(K11)，即低浓度的硝酸。Kushiro Mire是硝酸的水槽。泥泞河水中约有一半的硝酸消失，奥兹伦帕湖的pH在6.3-7.5之间呈中性。另一方面，沼泽的溪水pH在6左右呈酸性，而努什日地区的溪水在5以下的pH值特别低。中、低pH值(如6.5)的大河流量最大。大江河硝酸盐浓度较高，亚硝酸和磷酸盐含量较低。酸性溪水一般营养物质含量低，山水营养物质含量高。努什日江水、婴儿水等出水营养盐含量较低。从山区到奥兹伦帕湖的溪水中的氮被消耗在湖中。5条溪流的水温相对较低。我想那些小溪里一定有地下水的泉水。