检索结果相关分组
- 鄱阳湖湿地土壤有机碳氮同位素特征及其环境意义
- 作者： 王毛兰 赖建平 胡珂图 张丁苓 来源：中国环境科学 年份：2016 文献类型 ：期刊 关键词： 氮同位素 鄱阳湖 物质来源 湿地土壤 碳同位素
- 描述：总有机碳（TOC）的含量在0.45%1.58%之间,总氮（TN）含量变化范围为0.06%0.17%;各入湖河流TOC含量为0.41%1.18%,TN含量在0.05%0.13%之间.鄱阳湖湖区湿地
- 全文：总有机碳（TOC）的含量在0.45%1.58%之间,总氮（TN）含量变化范围为0.06%0.17%;各入湖河流TOC含量为0.41%1.18%,TN含量在0.05%0.13%之间.鄱阳湖湖区湿地
- 鄱阳湖湿地土壤有机碳氮同位素特征及其环境意义
- 作者： 王毛兰 赖建平 胡珂图 张丁苓 来源：中国环境科学 年份：2016 文献类型 ：期刊 关键词： 氮同位素 鄱阳湖 物质来源 湿地土壤 碳同位素
- 描述：总有机碳（TOC）的含量在0.45%1.58%之间,总氮（TN）含量变化范围为0.06%0.17%;各入湖河流TOC含量为0.41%1.18%,TN含量在0.05%0.13%之间.鄱阳湖湖区湿地
- 全文：总有机碳（TOC）的含量在0.45%1.58%之间,总氮（TN）含量变化范围为0.06%0.17%;各入湖河流TOC含量为0.41%1.18%,TN含量在0.05%0.13%之间.鄱阳湖湖区湿地
- 应用碳、氮稳定同位素研究鄱阳湖枯水末期水生食物网结构
- 作者： 王玉玉 于秀波 张亮 徐军 来源：生态学报 年份：2009 文献类型 ：期刊 关键词： δ13C 人类活动 鄱阳湖 δ15N 食物网
- 描述：稳定碳、氮同位素比值分析技术是研究生态系统中物质循环与能量流动的有效技术。δ13C值常用来分析消费者食物来源,δ15N值常用来确定生物在食物网中的营养位置。应用稳定同位素技术分析了鄱阳湖北部湖口县
- 全文：稳定碳、氮同位素比值分析技术是研究生态系统中物质循环与能量流动的有效技术。δ13C值常用来分析消费者食物来源,δ15N值常用来确定生物在食物网中的营养位置。应用稳定同位素技术分析了鄱阳湖北部湖口县
- 鄱阳湖乐安江流域非点源磷输移的时空变化
- 作者： 李淼 高海鹰 张奇 姜三元 来源：东南大学学报(自然科学版) 年份：2015 文献类型 ：期刊 关键词： 非点源磷输移 鄱阳湖 乐安江 影响因素 时空变化
- 描述：在鄱阳湖乐安江子流域设立了17个水质采样点,通过实验室测量获得2010年10月—2011年8月河流水体总磷(TP)的浓度数据.数据分析结合模型模拟得出以下结论:监测期内,流域内河流水体TP浓度变化
- 全文：在鄱阳湖乐安江子流域设立了17个水质采样点,通过实验室测量获得2010年10月—2011年8月河流水体总磷(TP)的浓度数据.数据分析结合模型模拟得出以下结论:监测期内,流域内河流水体TP浓度变化
- 鄱阳湖典型湿地沉水植物的分布格局及其水环境影响因子
- 作者： 简敏菲 简美锋 李玲玉 汪斯琛 余厚平 余冠军 来源：长江流域资源与环境 年份：2015 文献类型 ：期刊 关键词： 鄱阳湖湿地 主成分分析 双向指示种分析 水环境因子 典范对应分析 沉水植物
- 描述：的系数值较大,是影响沉水植物分布的关键因子;典范对应分析(CCA)结果显示,水深、总磷和总氮对苦草和黑藻的影响显著,水体透明度是马来眼子菜的主要影响因子。
- 全文：的系数值较大,是影响沉水植物分布的关键因子;典范对应分析(CCA)结果显示,水深、总磷和总氮对苦草和黑藻的影响显著,水体透明度是马来眼子菜的主要影响因子。
- 鄱阳湖入湖、出湖污染物通量时空变化及影响因素(2008-2012年)
- 作者： 刘发根 王仕刚 郭玉银 曹美 来源：湖泊科学 年份：2014 文献类型 ：期刊 关键词： 算法 鄱阳湖 影响因素 时空变化 污染物通量
- 描述：污染源特征优选算法,计算总磷(TP)、氨氮(NH3-N)、高锰酸盐指数(CODMn)的入、出湖污染物通量,并分析时空变化特征及影响因素.结果表明:(1)出湖口和乐安河入湖口断面的NH3-N、TP及昌江
- 全文：污染源特征优选算法,计算总磷(TP)、氨氮(NH3-N)、高锰酸盐指数(CODMn)的入、出湖污染物通量,并分析时空变化特征及影响因素.结果表明:(1)出湖口和乐安河入湖口断面的NH3-N、TP及昌江
- 鄱阳湖流域双季稻最佳水肥管理方式研究
- 作者： 张亦涛 张继宗 徐昌旭 彭春瑞 刘光荣 刘宏斌 刘卫东 来源：中国稻米 年份：2011 文献类型 ：期刊 关键词： 吸氮量 氮肥利用率 产量 双季稻 氮素损失风险 水肥管理
- 描述：以鄱阳湖流域双季稻为研究对象,基于灌溉、施氮量和施肥方式等3因素设置田间试验,从经济和环境效益两方面综合分析,探索最佳水分和施氮管理方式。结果表明,以每季氮肥150 kg/hm2为最佳施氮量,按5
- 全文：以鄱阳湖流域双季稻为研究对象,基于灌溉、施氮量和施肥方式等3因素设置田间试验,从经济和环境效益两方面综合分析,探索最佳水分和施氮管理方式。结果表明,以每季氮肥150 kg/hm2为最佳施氮量,按5
- 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.