检索结果相关分组
- 鄱阳湖藻类群落结构及其与水文条件关系研究
- 作者： 吴召仕 来源：中国科学院大学 年份：2014 文献类型 ：学位论文
- 描述：鄱阳湖藻类群落结构及其与水文条件关系研究
- 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.
- 水文变异条件下鄱阳湖流域生态流量研究
- 作者： 刘剑宇 张强 顾西辉 来源：生态学报 年份：2015 文献类型 ：期刊 关键词： 生态流量 鄱阳湖流域 水文变异
- 描述：。在此基础上,采用15种概率分布函数分别拟合五站各月变异前日流量序列,最终确定五站点各月最优分布函数及所对应的概率密度最大处的流量,即得河道内生态流量。研究表明:(1)抚河于1962年发生弱变异,赣江、修河
- 全文：。在此基础上,采用15种概率分布函数分别拟合五站各月变异前日流量序列,最终确定五站点各月最优分布函数及所对应的概率密度最大处的流量,即得河道内生态流量。研究表明:(1)抚河于1962年发生弱变异,赣江、修河
- 水文变异条件下鄱阳湖流域的生态流量
- 作者： 刘剑宇 张强 顾西辉 来源：生态学报 年份：2015 文献类型 ：期刊 关键词： 生态流量 鄱阳湖流域 水文变异
- 描述：。在此基础上,采用15种概率分布函数分别拟合5站各月变异前日流量序列,最终确定5站点各月最优分布函数及所对应的概率密度最大处的流量,即得河道内生态流量。研究表明:(1)抚河于1962年发生弱变异,赣江、修河
- 全文：。在此基础上,采用15种概率分布函数分别拟合5站各月变异前日流量序列,最终确定5站点各月最优分布函数及所对应的概率密度最大处的流量,即得河道内生态流量。研究表明:(1)抚河于1962年发生弱变异,赣江、修河
- 环鄱阳湖地区有条件率先发展
- 作者：暂无 来源：中国联合商报 年份：2010 文献类型 ：期刊
- 描述：环鄱阳湖地区有条件率先发展
- 越冬地气候条件对鄱阳湖自然保护区白琵鹭种群数量的影响
- 作者： 李佳 李言阔 缪泸君 谢光勇 袁芳凯 黄燕 许鹏 来源：生态学报 年份：2014 文献类型 ：期刊 关键词： 越冬地 鄱阳湖自然保护区 气候变化 种群数量 白琵鹭
- 描述：的种群数量与白琵鹭越冬期当年冬季各月的气温和降水变量相关系数较小,且均没有显著的相关性。同时,发现越冬地的气候条件对白琵鹭种群数量的影响存在显著的时滞效应:越冬期的月值气候变量与1—9a后的白琵鹭种群
- 全文：的种群数量与白琵鹭越冬期当年冬季各月的气温和降水变量相关系数较小,且均没有显著的相关性。同时,发现越冬地的气候条件对白琵鹭种群数量的影响存在显著的时滞效应:越冬期的月值气候变量与1—9a后的白琵鹭种群
- 越冬地气候条件对鄱阳湖自然保护区白琵鹭种群数量的影响
- 作者： 李佳 李言阔 缪泸君 谢光勇 袁芳凯 黄燕 许鹏 来源：生态学报 年份：2014 文献类型 ：期刊 关键词： 越冬地 鄱阳湖自然保护区 气候变化 种群数量 白琵鹭
- 描述：的种群数量与白琵鹭越冬期当年冬季各月的气温和降水变量相关系数较小,且均没有显著的相关性。同时,发现越冬地的气候条件对白琵鹭种群数量的影响存在显著的时滞效应:越冬期的月值气候变量与1—9a后的白琵鹭种群
- 全文：的种群数量与白琵鹭越冬期当年冬季各月的气温和降水变量相关系数较小,且均没有显著的相关性。同时,发现越冬地的气候条件对白琵鹭种群数量的影响存在显著的时滞效应:越冬期的月值气候变量与1—9a后的白琵鹭种群
- 淹水过程及营养盐对鄱阳湖湿地砂质沉积物反硝化的影响
- 作者： 唐陈杰 来源：中国科学院大学 年份：2014 文献类型 ：学位论文
- 描述：淹水过程及营养盐对鄱阳湖湿地砂质沉积物反硝化的影响
- 淹水过程及营养盐对鄱阳湖湿地砂质沉积物反硝化的影响
- 作者： 唐陈杰 来源：中国科学院大学 年份：2014 文献类型 ：学位论文
- 描述：淹水过程及营养盐对鄱阳湖湿地砂质沉积物反硝化的影响
- 淹水过程及营养盐对鄱阳湖湿地砂质沉积物反硝化的影响
- 作者： 唐陈杰 来源：中国科学院大学 年份：2014 文献类型 ：学位论文
- 描述：淹水过程及营养盐对鄱阳湖湿地砂质沉积物反硝化的影响