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- 鄱阳湖湿地典型草洲主要植物种群在5 个资源环境梯度上的生态位特征
- 作者： 段后浪 赵安 姚忠 来源：生态与农村环境学报 年份：2017 文献类型 ：期刊 关键词： 鄱阳湖典型湿地 生态位宽度 生态位重叠 植物种群
- 描述：基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(1 m×1 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
- 全文：基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(1 m×1 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
- 鄱阳湖湿地典型草洲主要植物种群在5 个资源环境梯度上的生态位特征
- 作者： 段后浪 赵安 姚忠 来源：生态与农村环境学报 年份：2017 文献类型 ：期刊 关键词： 鄱阳湖典型湿地 生态位宽度 生态位重叠 植物种群
- 描述：基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(1 m×1 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
- 全文：基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(1 m×1 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
- 模拟研究变化水位和流速条件下鄱阳湖磷释放特征
- 作者： 童亚莉 梁涛 王凌青 李可欣 来源：Journal of Geographical Sciences 年份：2017 文献类型 ：期刊
- 描述：Since the construction of the Three Gorges Dam,the Poyang Lake hydrological characteristics obviously changed.During the impoundment period of the Three Gorges Reservoir,the hydrodynamic factors of Poyang Lake varied.Water level dropped,the velocity decreased and water exchange time lengthened,which changed the release of phosphorous from sediments.In order to investigate how the hydrodynamic factors influence the release of phosphorous from sediments,we used a two-way annular flume device to simulate the release characteristics of phosphorous from sediments under variable water levels and velocities.We found that both water level rising and velocity increasing could enhance the disturbance intensity to sediments,which caused the increase of suspended solids(SS)concentration,total phosphorus(TP)concentration in the overlying water,and the ability that phosphorus released to overlying water from sediments enhanced as well:when overlying water velocity maintained 0.3 m/s,SS concentration increased to 4035.85 mg/L at the water level25 cm which was about 25 times compared to the minimum value and TP concentration in the overlying water also reached the maximum value at the water level 25 cm which was 1.2times that of the value at 10 cm;when water level maintained 15 cm,SS concentration increased to 4363.35 mg/L at the velocity of 0.5 m/s which was about 28 times compared to the value of 0 m/s,and TP concentration in the overlying water increased from 0.11 mg/L to 0.44mg/L.When the water level maintained 15 cm,the phosphorous release rate reached the maximum value of 4.86 mg/(md)at 0.4 m/s.The concentration of total dissolved phosphorous(TDP)and soluble reactive phosphate(SRP)both in overlying water and sediment-water interface were negatively correlated with p H.Using the parabolic equation,the optimum water level at a velocity of 0.3 m/s was calculated to be 0.57 cm,and the optimum velocity at water level of 15 cm was found to be 0.2 m/s.
- 全文：Since the construction of the Three Gorges Dam,the Poyang Lake hydrological characteristics obviously changed.During the impoundment period of the Three Gorges Reservoir,the hydrodynamic factors of Poyang Lake varied.Water level dropped,the velocity decreased and water exchange time lengthened,which changed the release of phosphorous from sediments.In order to investigate how the hydrodynamic factors influence the release of phosphorous from sediments,we used a two-way annular flume device to simulate the release characteristics of phosphorous from sediments under variable water levels and velocities.We found that both water level rising and velocity increasing could enhance the disturbance intensity to sediments,which caused the increase of suspended solids(SS)concentration,total phosphorus(TP)concentration in the overlying water,and the ability that phosphorus released to overlying water from sediments enhanced as well:when overlying water velocity maintained 0.3 m/s,SS concentration increased to 4035.85 mg/L at the water level25 cm which was about 25 times compared to the minimum value and TP concentration in the overlying water also reached the maximum value at the water level 25 cm which was 1.2times that of the value at 10 cm;when water level maintained 15 cm,SS concentration increased to 4363.35 mg/L at the velocity of 0.5 m/s which was about 28 times compared to the value of 0 m/s,and TP concentration in the overlying water increased from 0.11 mg/L to 0.44mg/L.When the water level maintained 15 cm,the phosphorous release rate reached the maximum value of 4.86 mg/(md)at 0.4 m/s.The concentration of total dissolved phosphorous(TDP)and soluble reactive phosphate(SRP)both in overlying water and sediment-water interface were negatively correlated with p H.Using the parabolic equation,the optimum water level at a velocity of 0.3 m/s was calculated to be 0.57 cm,and the optimum velocity at water level of 15 cm was found to be 0.2 m/s.