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鄱阳湖湿地泗洲头洲滩浅层土壤氮素的时空特征
作者: 谢冬明 周国宏 陈亚云 周杨明 贾俊松 熊晓龙 余明泉  来源:江西师范大学学报(自然科学版) 年份:2017 文献类型 :期刊 关键词: 鄱阳湖湿地  土壤氮素  洲滩湿地  空间分异 
描述:湿地是全球氮循环的N源、N汇和N转化器,自然湿地氮的研究对于揭示生态系统氮循环的规律具有重要意义.以鄱阳湖湿地泗洲头为研究区域,根据湿地海拔高程梯度(10~17 m)采取表层土壤0~20 cm土层
全文:湿地是全球氮循环的N源、N汇和N转化器,自然湿地氮的研究对于揭示生态系统氮循环的规律具有重要意义.以鄱阳湖湿地泗洲头为研究区域,根据湿地海拔高程梯度(10~17 m)采取表层土壤0~20 cm土层
鄱阳湖湿地泗洲头洲滩浅层土壤氮素的时空特征
作者: 谢冬明 周国宏 陈亚云 周杨明 贾俊松 熊晓龙 余明泉  来源:江西师范大学学报(自然科学版) 年份:2017 文献类型 :期刊 关键词: 鄱阳湖湿地  土壤氮素  洲滩湿地  空间分异 
描述:湿地是全球氮循环的N源、N汇和N转化器,自然湿地氮的研究对于揭示生态系统氮循环的规律具有重要意义.以鄱阳湖湿地泗洲头为研究区域,根据湿地海拔高程梯度(10~17 m)采取表层土壤0~20 cm土层
全文:湿地是全球氮循环的N源、N汇和N转化器,自然湿地氮的研究对于揭示生态系统氮循环的规律具有重要意义.以鄱阳湖湿地泗洲头为研究区域,根据湿地海拔高程梯度(10~17 m)采取表层土壤0~20 cm土层
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.
鄱阳湖经济区经济发展协模型及经济结构动态分析
作者: 吴文新  年份:2017 文献类型 :学位论文 关键词: 动态分析  经济发展  经济结构 
描述:鄱阳湖经济区经济发展协模型及经济结构动态分析
鄱阳湖经济区经济发展协模型及经济结构动态分析
作者: 吴文新  年份:2017 文献类型 :学位论文 关键词: 动态分析  经济发展  经济结构 
描述:鄱阳湖经济区经济发展协模型及经济结构动态分析
鄱阳湖经济区经济发展协模型及经济结构动态分析
作者: 吴文新  年份:2017 文献类型 :学位论文 关键词: 动态分析  经济发展  经济结构 
描述:鄱阳湖经济区经济发展协模型及经济结构动态分析
鄱阳湖流域水沙时空演变特征及其机理
作者: 孙鹏 张强 陈晓宏 陈永勤  来源:地理学报 年份:2017 文献类型 :期刊 关键词: 突变分析  鄱阳湖流域  水沙趋势分析 
描述:)1956-2005年的水沙序列,在系统搜集流域内水库信息的基础上,深入探讨了流域内水沙变化的原因。研究结果表明:(1)鄱阳湖流域各支流的水沙变化特征相异;除李家渡站径流无明显变化外,其余4站都有增加
全文:)1956-2005年的水沙序列,在系统搜集流域内水库信息的基础上,深入探讨了流域内水沙变化的原因。研究结果表明:(1)鄱阳湖流域各支流的水沙变化特征相异;除李家渡站径流无明显变化外,其余4站都有增加
鄱阳湖枯水期沉积物磷释放特征及对水位变化响应
作者: 王悦敏 倪兆奎 冯明雷 刘志刚 王圣瑞 李晓秀  来源:环境科学学报 年份:2017 文献类型 :期刊 关键词: 释放特征  水位  沉积物  鄱阳湖   
描述:通过研究鄱阳湖枯水期不同高程沉积物磷释放热力学和动力学特征,试图建立沉积物磷释放与水位间响应关系,进一步揭示由于江湖关系变化导致的水位下降对鄱阳湖沉积物磷释放风险影响.结果表明:(1)鄱阳湖沉积物
全文:通过研究鄱阳湖枯水期不同高程沉积物磷释放热力学和动力学特征,试图建立沉积物磷释放与水位间响应关系,进一步揭示由于江湖关系变化导致的水位下降对鄱阳湖沉积物磷释放风险影响.结果表明:(1)鄱阳湖沉积物
[0图]鄱阳湖资源环境与人类活动研究
作者: 舒晓波  来源:南昌:江西人民出版社 年份:2017 文献类型 :图书 关键词: 生态环境  流域  文集  鄱阳湖  人类活动影响 
描述:本书系江西师范大学鄱阳湖湿地与流域研究实验室2004年至2013年间以湿地与流域研究为主题公开发表的学术论文集。全书主要包括鄱阳湖环境灾害与公共卫生研究鄱阳湖土地利用与土地覆盖研究鄱阳湖区域格局与区域政策研究鄱阳湖人类活动与生态环境研究
全文:本书系江西师范大学鄱阳湖湿地与流域研究实验室2004年至2013年间以湿地与流域研究为主题公开发表的学术论文集。全书主要包括鄱阳湖环境灾害与公共卫生研究鄱阳湖土地利用与土地覆盖研究鄱阳湖区域格局与区域政策研究鄱阳湖人类活动与生态环境研究
水位变化对鄱阳湖三角洲分流河道沉积特征的影响
作者: 王军 杨勇 张阳 杨保良 蒋龙 邱隆伟 赵俊英  来源:中国石油大学学报(自然科学版) 年份:2017 文献类型 :期刊 关键词: 沉积特征  鄱阳湖三角洲  水位变化  分流河道 
描述:选取鄱阳湖赣江中支三角洲平原分流河道和信江三角洲前缘分流河道,采用现代沉积考察、剖面挖掘、粒度分析等方法,就水位变化对分流河道沉积特征的影响进行研究。结果表明:在赣江中支三角洲平原分流河道内发育滞留
全文:选取鄱阳湖赣江中支三角洲平原分流河道和信江三角洲前缘分流河道,采用现代沉积考察、剖面挖掘、粒度分析等方法,就水位变化对分流河道沉积特征的影响进行研究。结果表明:在赣江中支三角洲平原分流河道内发育滞留
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