Research on mechanism of nitrogen saturation of forest soil with Nox of atmospheric origin

大气源Nox森林土壤氮饱和机理研究

• 批准号: 17560451
• 负责人: KOBATAKE Shigeki
• 金额: $ 2.24万
• 依托单位: Gunma University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560451/
• 关键词: water quality of mountain stream; nitrogen circulation; nitrogen saturation; 物質循環

There is a remarkable difference in the density of Nitrate-nitrogen of the mountain stream in the east and west side of Tone River. It is suggested that this phenomena is caused by regional distribution of Nox of the metropolitan area origin. This research simulated leaching to the river of nitrogen by using the nitrogen cycle model of the forest. In this model, the absorbed amount of nitrogen necessary for the tree's growing up is related to the amount of the carbon of the tree. The result of the simulation was almost corresponding to the value of the measurement. However, there were some regions where the observed amount of nitrogen in the soil did not correspond to the observed concentration of nitrogen of the mountain stream. The laboratory experiments were done looking for the reason of this phenomena. The difference of the amount of the denitrification bacterium was checked. However, the correlation between the shape of the distribution of the observed concentration of nitrogen in the soil and the amount of denitrification bacterium was not found. The further investigation is necessary to explain the difference between nitrogen concentration of soil and stream.

东、西两侧山溪硝态氮浓度存在显著差异。这可能是大都市区来源的氮氧化物的区域分布造成的。本研究利用森林氮素循环模型模拟了氮素向河流的淋溶。在该模型中，树木生长所需的氮吸收量与树木的碳量有关。仿真结果与实测值基本一致。然而，也有一些地区，在土壤中观察到的氮量不对应于观察到的氮浓度的山溪。进行了实验室实验，寻找这种现象的原因。考察了反硝化细菌数量的差异。但土壤中氮素浓度的分布形态与反硝化细菌数量的相关性尚不明确，需要进一步研究以解释土壤和河流中氮素浓度的差异。

项目成果

関東平野北西部における森林からの渓流水中の硝酸態窒素濃度の地域分布特性

西北关东平原森林山溪水硝态氮浓度区域分布特征

• 发表时间: 2006
• 期刊: 日本森林学会誌 88・6
• 作者: 長谷川香織;小葉竹重機
• 通讯作者: 小葉竹重機

Characteristics of nitrate concentration of headwater stream located in the northwest of Tokyo Metropolitan area

东京都西北部源头水流硝酸盐浓度特征

• 发表时间: 2006
• 期刊: Journal of the Japan Forest Society Vol.88, No.6
• 作者: Hasegawa Koari;Kobatake Shigeki
• 通讯作者: Kobatake Shigeki