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模拟研究变化水位和流速条件下鄱阳湖释放特征
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.
鄱阳湖典型湿地土壤DDTs残留及其相关性研究
作者: 李俊  来源:上海大学 年份:2017 文献类型 :学位论文 关键词: DDTs残留  鄱阳湖  典型湿地土壤  营养元素  空间分布 
描述:层和SB层,而DDD随着土壤层次的加深是增加的。通过Long等提出的ERL和ERM值,对研究区域的DDTs作风险评估,得出:总体上,研究区域土壤DDTs处于低生态风险状态。 另外本研究湿地中全、全都呈现出随着土壤深度的增加而减少的趋势,并且与有机质的分布趋势一致。全钾的分布在土壤垂直剖面上
全文:层和SB层,而DDD随着土壤层次的加深是增加的。通过Long等提出的ERL和ERM值,对研究区域的DDTs作风险评估,得出:总体上,研究区域土壤DDTs处于低生态风险状态。 另外本研究湿地中全、全都呈现出随着土壤深度的增加而减少的趋势,并且与有机质的分布趋势一致。全钾的分布在土壤垂直剖面上
鄱阳湖典型湿地土壤DDTs残留及其相关性研究
作者: 李俊  来源:上海大学 年份:2017 文献类型 :学位论文 关键词: DDTs残留  鄱阳湖  典型湿地土壤  营养元素  空间分布 
描述:层和SB层,而DDD随着土壤层次的加深是增加的。通过Long等提出的ERL和ERM值,对研究区域的DDTs作风险评估,得出:总体上,研究区域土壤DDTs处于低生态风险状态。 另外本研究湿地中全、全都呈现出随着土壤深度的增加而减少的趋势,并且与有机质的分布趋势一致。全钾的分布在土壤垂直剖面上
全文:层和SB层,而DDD随着土壤层次的加深是增加的。通过Long等提出的ERL和ERM值,对研究区域的DDTs作风险评估,得出:总体上,研究区域土壤DDTs处于低生态风险状态。 另外本研究湿地中全、全都呈现出随着土壤深度的增加而减少的趋势,并且与有机质的分布趋势一致。全钾的分布在土壤垂直剖面上
鄱阳湖典型湿地土壤DDTs残留及其相关性研究
作者: 李俊  来源:上海大学 年份:2017 文献类型 :学位论文 关键词: DDTs残留  鄱阳湖  典型湿地土壤  营养元素  空间分布 
描述:层和SB层,而DDD随着土壤层次的加深是增加的。通过Long等提出的ERL和ERM值,对研究区域的DDTs作风险评估,得出:总体上,研究区域土壤DDTs处于低生态风险状态。 另外本研究湿地中全、全都呈现出随着土壤深度的增加而减少的趋势,并且与有机质的分布趋势一致。全钾的分布在土壤垂直剖面上
全文:层和SB层,而DDD随着土壤层次的加深是增加的。通过Long等提出的ERL和ERM值,对研究区域的DDTs作风险评估,得出:总体上,研究区域土壤DDTs处于低生态风险状态。 另外本研究湿地中全、全都呈现出随着土壤深度的增加而减少的趋势,并且与有机质的分布趋势一致。全钾的分布在土壤垂直剖面上
2008~2016 年鄱阳湖生态经济区生态系统服务价值的时空变化研究
作者: 赵志刚 余德 韩成云 王凯荣  来源:长江流域资源与环境 年份:2017 文献类型 :期刊 关键词: 土地利用/覆被  时空格局  鄱阳湖生态经济区  生态系统服务价值 
描述:加剧,生态系统服务价值总体呈减少趋势,其中减少最明显的是林地和水域系统价值。水源涵养和土壤保持是鄱阳湖生态经济区最主要的生态系统服务功能,两者合计占38%以上,但食物生产、水源涵养与废物处理的各单项生态服务
全文:加剧,生态系统服务价值总体呈减少趋势,其中减少最明显的是林地和水域系统价值。水源涵养和土壤保持是鄱阳湖生态经济区最主要的生态系统服务功能,两者合计占38%以上,但食物生产、水源涵养与废物处理的各单项生态服务
鄱阳湖不同区域沉积物细菌群落结构、功能变化及其与环境因子的关系
作者: 金笑 寇文伯 于昊天 刘亚军 马燕天 吴兰  来源:环境科学研究 年份:2017 文献类型 :期刊 关键词: 微生物代谢功能  T  细菌群落结构  Biolog  鄱阳湖  RFLP分析  Eco微平板法 
描述:的主要因子,而水深、pH、速效[w(NH4+-N)、w(NO3--N)]、重金属[w(Zn)、w(Cu)、w(Cd)]是影响微生物代谢多样性的显著因子.研究显示,重金属(Zn)对鄱阳湖沉积物细菌群落结构
全文:的主要因子,而水深、pH、速效[w(NH4+-N)、w(NO3--N)]、重金属[w(Zn)、w(Cu)、w(Cd)]是影响微生物代谢多样性的显著因子.研究显示,重金属(Zn)对鄱阳湖沉积物细菌群落结构
鄱阳湖出流水质2004~2014 年变化及其对水位变化的响应:对水质监测频率的启示
作者: 李冰 杨桂山 万荣荣 刘宝贵 戴雪 许晨  来源:长江流域资源与环境 年份:2017 文献类型 :期刊 关键词: 变化趋势  采样频率  水质  鄱阳湖出流  水情响应 
描述:通过对鄱阳湖湖口20042014年以周为单位的水质指标,包括溶解氧(DO),氨(NH4+-N)和高锰酸盐指数(CODMn)的变化特征及其与水位响应关系进行分析,并对合理的监测频率进行了探讨
全文:通过对鄱阳湖湖口20042014年以周为单位的水质指标,包括溶解氧(DO),氨(NH4+-N)和高锰酸盐指数(CODMn)的变化特征及其与水位响应关系进行分析,并对合理的监测频率进行了探讨
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