Study on Flow, Sediment and Nutrients, Primary Production in Gravel rivers for Restoration of Ecosystem

砾石河流量、泥沙、养分、初级生产力研究以恢复生态系统

基本信息

批准号：
14205070
负责人：
IKEDA Synsuke
金额：
$ 36.44万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205070/
关键词：
Gravel rivers Nutrients transport Primary production Periphyton Sediment transport pollution load in watershed Plants on flood plain 土砂流出流れ栄養塩有機物洪水粒度分布一次生産

项目摘要

1.Laboratory experiments were performed to know the characteristics of growth, detachment and interspecific competition of filamentous and non-filamentous periphyton, in which the primary production rates, the respiration rates and the detachment rates of each kind of periphyton were measured by using various methods. The results of the experiments show that there are no significant differences of the primary production rates and the respiration rates between filamentous and non-filamentous periphyton. The detachment rate of periphyton is found to increase with friction velocity, and the detachment rate of filamentous periphyton takes smaller value than that of non-filamentous periphyton.2.The field observations were performed to understand the characteristics of growth and nutrient uptake of Phragmites japonica on flood plain in a gravel river, in which the temporal variation of plant biomass, the content of nutrients of vegetation and the concentrations of nutrients in the groundwater were measured. The result of the field observations show that the growth of the vegetation was restricted by the groundwater level in the present observation site. The hydroponics experiment of the riparian vegetation was conducted to understand the nutrition uptake due to photosynthesis. The results of the experiment show that the nitrogen uptake of the vegetation was closely associated with the amount of respiration of the roots of the vegetation.3.Field observation on the supply of sediment and nutrients from Nagura river basin, Ishigaki Island, was studied. They were estimated by measuring water velocity, depth, turbidity, concentrations of carbon, nitrogen and phosphrous. It was found that heavy rains yield nutrients mainly in particulate type. However, sugar cane field yields dissolved nutrients gradually after the rain. The timing of flood and tide is an important factor to control the discharge of sediment and nutrients to the tidal area such as lagoon and river mouth.

1.进行了实验室实验，以了解丝状和非丝状周围的生长，脱离和种间竞争的特征，其中通过使用各种方法测量了每种围叶顿的主要生产率，呼吸速率以及每种类型的周围的分离率。实验的结果表明，主要生产率没有显着差异，丝状周围和非丝状周围的呼吸速率没有显着差异。 The detachment rate of periphyton is found to increase with friction velocity, and the detachment rate of filamentous periphyton takes smaller value than that of non-filamentous periphyton.2.The field observations were performed to understand the characteristics of growth and nutrient uptake of Phragmites japonica on flood plain in a gravel river, in which the temporal variation of plant biomass, the content of nutrients of vegetation and the测量地下水中的养分浓度。田间观察结果表明，植被的生长受到本观测部位的地下水位的限制。进行了河岸植被的水培实验，以了解由于光合作用引起的营养吸收。实验的结果表明，植被的氮摄取与植被根的呼吸量密切相关。3。研究了从Ishigaki Island的Nagura River盆地供应沉积物和营养物质的场观察，研究了。通过测量水速度，深度，浊度，碳，氮和磷酸盐的浓度来估计它们。发现大雨主要在颗粒类型中产生营养。但是，糖岩场在雨后会逐渐产生溶解的营养。洪水和潮汐的时机是控制沉积物和营养物质到潮汐区域（如泻湖和河口）的重要因素。