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基于MODIS的鄱阳湖湿地植被变化及其对水位的响应研究
作者: 叶春 刘元波 赵晓松 吴桂平  来源:长江流域资源与环境 年份:2013 文献类型 :期刊 关键词: 湿地植被  水位  鄱阳湖  EVI  MODIS 
描述:针对鄱阳湖水情变化如何影响湖区湿地植被生长过程的问题,在鄱阳湖国家级自然保护区内的蚌湖—吴城生态断面上,选取3个梯度分布MODIS像元样点,基于2001~2010年MODIS增强型植被指数(EVI
全文:针对鄱阳湖水情变化如何影响湖区湿地植被生长过程的问题,在鄱阳湖国家级自然保护区内的蚌湖—吴城生态断面上,选取3个梯度分布MODIS像元样点,基于2001~2010年MODIS增强型植被指数(EVI
基于MODIS的鄱阳湖湿地植被变化及其对水位的响应研究
作者: 叶春 刘元波 赵晓松 吴桂平  来源:长江流域资源与环境 年份:2013 文献类型 :期刊 关键词: 湿地植被  水位  鄱阳湖  EVI  MODIS 
描述:针对鄱阳湖水情变化如何影响湖区湿地植被生长过程的问题,在鄱阳湖国家级自然保护区内的蚌湖—吴城生态断面上,选取3个梯度分布MODIS像元样点,基于2001~2010年MODIS增强型植被指数(EVI
全文:针对鄱阳湖水情变化如何影响湖区湿地植被生长过程的问题,在鄱阳湖国家级自然保护区内的蚌湖—吴城生态断面上,选取3个梯度分布MODIS像元样点,基于2001~2010年MODIS增强型植被指数(EVI
环鄱阳湖城市群生产性服务业发展模式分析
作者: 席元凯  来源:商业经济研究 年份:2016 文献类型 :期刊 关键词: 生产性服务业  发展模式选择  环鄱阳湖城市群  定量分析 
描述:本文通过分析近年来欧美发达国家大力提倡振兴工业,重点发展生产性服务业,指出探讨环鄱阳湖城市群生产性服务业发展模式的必要性。同时,利用工具eviews6.0定量分析影响生产性服务业发展的因素,进而指出发展环鄱阳湖城市群的模式宜采取“一核三带”模式、“两业”互动模式和“互联网+”模式,以供类似江西这种欠发达地区的生产性服务业发展参考。
全文:本文通过分析近年来欧美发达国家大力提倡振兴工业,重点发展生产性服务业,指出探讨环鄱阳湖城市群生产性服务业发展模式的必要性。同时,利用工具eviews6.0定量分析影响生产性服务业发展的因素,进而指出发展环鄱阳湖城市群的模式宜采取“一核三带”模式、“两业”互动模式和“互联网+”模式,以供类似江西这种欠发达地区的生产性服务业发展参考。
产业结构优化路径选择:基于环鄱阳湖生态经济区实证分析
作者: 胡庆浩  来源:现代商贸工业 年份:2013 文献类型 :期刊 关键词: 实证分析  产业结构  鄱阳湖生态经济区  优化路径 
描述:2007年以来,环鄱阳湖生态经济区的各个行业都在不同程度上受到来自国际金融危机的冲击,产业结构的失衡问题目益凸显。如何进行产业结构调整?产业结构优化的最优路径是什么?选择内向型优化路径还是外向型优化路径?通过eVieWS软件对影响环鄱阳湖生态经济区产业结构的因素进行分析后,得出立足于国内价值链,又积极融入全球价值链的自主型模式,对接和融合全球价值链和国内价值链,走自主型产业结构优化路径,并给出了相关政策建议。
全文:2007年以来,环鄱阳湖生态经济区的各个行业都在不同程度上受到来自国际金融危机的冲击,产业结构的失衡问题目益凸显。如何进行产业结构调整?产业结构优化的最优路径是什么?选择内向型优化路径还是外向型优化路径?通过eVieWS软件对影响环鄱阳湖生态经济区产业结构的因素进行分析后,得出立足于国内价值链,又积极融入全球价值链的自主型模式,对接和融合全球价值链和国内价值链,走自主型产业结构优化路径,并给出了相关政策建议。
鄱阳湖农业区多熟种植时空格局特征遥感分析
作者: 闫慧敏 黄河清 肖向明 姜鲁光  来源:生态学报 年份:2008 文献类型 :期刊 关键词: 时空分析  多时相遥感  鄱阳湖  土地利用  多熟种植 
描述:为研究区,结合多时相MODIS影像表达的作物生长规律和农业物候观测记录,检测并分析农业多熟种植的时空格局特征。研究结果表明空间分辨率500m、8d合成的MODIS/EVI时间序列数据能够定量表达出农业
全文:为研究区,结合多时相MODIS影像表达的作物生长规律和农业物候观测记录,检测并分析农业多熟种植的时空格局特征。研究结果表明空间分辨率500m、8d合成的MODIS/EVI时间序列数据能够定量表达出农业
鄱阳湖湿地典型草洲主要植物种群在5 个资源环境梯度上的生态位特征
作者: 段后浪 赵安 姚忠  来源:生态与农村环境学报 年份:2017 文献类型 :期刊 关键词: 鄱阳湖典型湿地  生态位宽度  生态位重叠  植物种群 
描述:基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(11 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
全文:基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(11 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
鄱阳湖湿地典型草洲主要植物种群在5 个资源环境梯度上的生态位特征
作者: 段后浪 赵安 姚忠  来源:生态与农村环境学报 年份:2017 文献类型 :期刊 关键词: 鄱阳湖典型湿地  生态位宽度  生态位重叠  植物种群 
描述:基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(11 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
全文:基于鄱阳湖典型湿地恒湖农场茶叶港草洲19个样地(5 m×5 m)95个样方(11 m)实地调查得到的10种主要植物和高程、土壤pH值、电导率、含水量、有机质含量5个资源环境数据,采用
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.
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