检索结果相关分组
- 鄱阳湖不同高程沉积物中磷形态特征研究
- 作者： 刘凯 倪兆奎 王圣瑞 倪才英 来源：中国环境科学 年份：2015 文献类型 ：期刊 关键词： 江湖关系 磷形态 沉积物 鄱阳湖 分布特征
- 描述：选取了枯水期鄱阳湖10~13m高程共14个出露表层沉积物样品,通过研究其总磷(TP)及各形态磷含量与分布特征,试图揭示江湖关系变化导致的水位下降对鄱阳湖沉积物磷潜在释放风险的影响.结果表明,鄱阳湖
- 全文：选取了枯水期鄱阳湖10~13m高程共14个出露表层沉积物样品,通过研究其总磷(TP)及各形态磷含量与分布特征,试图揭示江湖关系变化导致的水位下降对鄱阳湖沉积物磷潜在释放风险的影响.结果表明,鄱阳湖
- 鄱阳湖流域不同农业利用方式下的氮磷输出特征
- 作者： 余进祥 赵小敏 吕琲 刘娅菲 来源：江西农业大学学报 年份：2010 文献类型 ：期刊 关键词： 农业利用方式 输出负荷 鄱阳湖流域 磷 输出特征 氮
- 描述：定点监测2008年鄱阳湖流域水田、水旱轮作、旱地、菜地、桔园、脐橙园和茶园等优势农业利用方式的田间降雨量、径流量及氮、磷的输出形态和负荷,分析不同农业利用方式的氮、磷输出特征和年输出负荷。结果表明
- 全文：定点监测2008年鄱阳湖流域水田、水旱轮作、旱地、菜地、桔园、脐橙园和茶园等优势农业利用方式的田间降雨量、径流量及氮、磷的输出形态和负荷,分析不同农业利用方式的氮、磷输出特征和年输出负荷。结果表明
- 鄱阳湖沉积物有机磷形态及对水位变化响应
- 作者： 马双丽 倪兆奎 王圣瑞 李晓秀 倪栋 来源：环境科学学报 年份：2016 文献类型 ：期刊 关键词： 水位变化 沉积物 有机磷形态 鄱阳湖
- 描述：选取鄱阳湖枯水期不同高程出露表层沉积物,通过研究有机磷含量及形态差异,试图揭示江湖关系变化引起的水位下降对鄱阳湖沉积物有机磷潜在释放风险的影响.结果表明:1鄱阳湖枯水期表层沉积物有机磷含量
- 全文：选取鄱阳湖枯水期不同高程出露表层沉积物,通过研究有机磷含量及形态差异,试图揭示江湖关系变化引起的水位下降对鄱阳湖沉积物有机磷潜在释放风险的影响.结果表明:1鄱阳湖枯水期表层沉积物有机磷含量
- 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.
- 鄱阳湖氮、磷营养盐的滞留效应研究
- 作者： 胡春华 楼倩 丁文军 周文斌 来源：环境污染与防治 年份：2012 文献类型 ：期刊 关键词： 营养盐 鄱阳湖 滞留效应
- 描述：、DIN的实际滞留效率随季节变化呈现出较一致的周期波动性;TP、DIN滞留的主要影响因素为径流输入、非点源污染输入以及经湖口的输出,降雨、降尘、底泥释放、生物滞留对其影响相对较小;鄱阳湖氮、磷收支估算
- 全文：、DIN的实际滞留效率随季节变化呈现出较一致的周期波动性;TP、DIN滞留的主要影响因素为径流输入、非点源污染输入以及经湖口的输出,降雨、降尘、底泥释放、生物滞留对其影响相对较小;鄱阳湖氮、磷收支估算
- 鄱阳湖苔草湿地甲烷释放特征
- 作者： 胡启武 朱丽丽 幸瑞新 尧波 胡斌华 来源：生态学报 年份：2011 文献类型 ：期刊 关键词： 鄱阳湖 甲烷 湿地 灰化苔草
- 描述：草湿地的甲烷(CH4)释放通量。结果表明:1)TC、TJ 2个试验处理CH4释放速率变化范围分别为-0.094—17.75 mg.m-.2h-1、-0.122—19.16 mg.m-.2h-1,均
- 全文：草湿地的甲烷(CH4)释放通量。结果表明:1)TC、TJ 2个试验处理CH4释放速率变化范围分别为-0.094—17.75 mg.m-.2h-1、-0.122—19.16 mg.m-.2h-1,均
- 江湖关系变化对鄱阳湖沉积物氨氮释放风险的影响
- 作者： 何宗健 吴志强 倪兆奎 刘婉清 王圣瑞 来源：中国环境科学 年份：2014 文献类型 ：期刊 关键词： 江湖关系 沉积物 鄱阳湖 释放风险 氨氮
- 描述：选取了鄱阳湖北部湖区、"五河"入湖尾闾区、湖心区共14个不同高程的表层出露沉积物样品,通过研究其总氮(TN)含量和氨氮(NH4+-N)释放热力学及动力学特征,试图揭示江湖关系变化导致的水位变化对
- 全文：选取了鄱阳湖北部湖区、"五河"入湖尾闾区、湖心区共14个不同高程的表层出露沉积物样品,通过研究其总氮(TN)含量和氨氮(NH4+-N)释放热力学及动力学特征,试图揭示江湖关系变化导致的水位变化对
- 鄱阳湖典型沉水植物分布区CO2、CH4释放日变化特征
- 作者： 聂兰琴 付姗 吴琴 胡启武 来源：江西师范大学学报(自然科学版) 年份：2014 文献类型 ：期刊 关键词： 鄱阳湖 CO2 CH4 沉水植物区
- 描述：为进一步准确评估鄱阳湖湿地碳平衡，探讨不同湿地类型碳排放特征与控制因子，在鄱阳湖南矶湿地国家级自然保护区选择典型沉水植物分布区进行了 CO2、CH4释放的昼夜变化观测.结果表明：1）CO2、CH4
- 全文：为进一步准确评估鄱阳湖湿地碳平衡，探讨不同湿地类型碳排放特征与控制因子，在鄱阳湖南矶湿地国家级自然保护区选择典型沉水植物分布区进行了 CO2、CH4释放的昼夜变化观测.结果表明：1）CO2、CH4
- 鄱阳湖苔草湿地非淹水期CO2释放特征
- 作者： 胡启武 幸瑞新 朱丽丽 吴琴 尧波 刘影 胡斌华 来源：应用生态学报 年份：2011 文献类型 ：期刊 关键词： Q10 土壤呼吸 鄱阳湖 湿地 生态系统呼吸
- 描述：呼吸),利用密闭箱-气相色谱法测定了非淹水期鄱阳湖苔草湿地CO,释放通量.结果表明:苔草湿地生态系统呼吸与土壤呼吸均具有明显的季节变化模式,释放速率变化范围分别为89.57～1243.99和75.30
- 全文：呼吸),利用密闭箱-气相色谱法测定了非淹水期鄱阳湖苔草湿地CO,释放通量.结果表明:苔草湿地生态系统呼吸与土壤呼吸均具有明显的季节变化模式,释放速率变化范围分别为89.57～1243.99和75.30