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

1997 ~ 2003年对钏路沼泽地的水系水质进行了监测。通过调查，估计了翁内川河和霍罗罗河的地貌变化。Takkobu河的电导率值和波动性高于其他河流。各河流中磷酸盐和亚硝酸氨浓度均处于较低水平。硝酸在当地具有一定的特征性，无季节性变化。高浓度硝酸（400- 500 ppb）位于Horo River（K9）和Onnenai River（K10）的上述位置。K9和K10的水被混合到硝酸浓度低的Horo河下游（K11）。钏路沼泽是一个硝酸池。泥河水体中约有一半的硝酸消失，Ozenuma湖的pH值为中性，在6.3 ~ 7.5之间。另一方面，沼泽中的河水pH值约为6，努希里地区的河水pH值特别低，低于5。Ooe河是最大的流量，它是中等低pH值，如6.5。大江河水中硝酸盐含量较高，亚硝酸和磷酸盐含量较低。酸性溪水一般为低营养盐，山区溪水为高营养盐。流出物中营养盐含量较低，如努希里河水和围隔水。从山区流入小泽沼湖的河水中的氮在小泽沼湖被消耗。五条溪流的水温相对较低。我想那些溪流里有地下水的泉水。

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.