检索结果相关分组
- 基于ENVISAT ASAR数据的鄱阳湖湿地植被状况研究
- 作者： 许崇琳 来源：武汉大学 年份：2009 文献类型 ：学位论文 关键词： 湿地植被 生物量 相关性、敏感性 ASAR影像 ALOS影像 植被高度
- 描述：基础；二是对鄱阳湖湿地植被进行微观研究，通过ENVISAT ASAR影像，估测各极化方式图像上的后向反射系数与植被高度和生物量之间的相关性和敏感性。结果表明，应用ENVISAT ASAR和ALOS影像
- 全文：基础；二是对鄱阳湖湿地植被进行微观研究，通过ENVISAT ASAR影像，估测各极化方式图像上的后向反射系数与植被高度和生物量之间的相关性和敏感性。结果表明，应用ENVISAT ASAR和ALOS影像
- 鄱阳湖地区沙地遥感调查及治理研究
- 作者： 赵小敏 傅建春 来源：水土保持研究 年份：2003 文献类型 ：期刊 关键词： 目视解译 鄱阳湖 沙地 遥感
- 描述：应用TM图像数据提取鄱阳湖地区沙地资源信息,采用目视解译的方法结合野外调查获得了鄱阳湖地区沙地资源的动态变化,得出1999年鄱阳湖地区的沙地面积为217.6 km2,比1991年减少了142.9 km2.分析了鄱阳湖地区泥沙的主要来源,提出了充分治理和开发沙地资源、保护生态环境的具体措施.
- 全文：应用TM图像数据提取鄱阳湖地区沙地资源信息,采用目视解译的方法结合野外调查获得了鄱阳湖地区沙地资源的动态变化,得出1999年鄱阳湖地区的沙地面积为217.6 km2,比1991年减少了142.9 km2.分析了鄱阳湖地区泥沙的主要来源,提出了充分治理和开发沙地资源、保护生态环境的具体措施.
- 一种改进的ACM算法及其在鄱阳湖水域监测中的应用
- 作者： 冷英 刘忠玲 张衡 王宇 李宁 来源：电子与信息学报 年份：2017 文献类型 ：期刊 关键词： 局部窄带 水域提取 合成孔径雷达 鄱阳湖
- 描述：上述问题,该文提出一种基于局部窄带的ACM边缘提取算法,并将其应用于Sentinel-1A获取的鄱阳湖水域时序观测图像中。该算法首先采用两级Otsu方法获取初始轮廓,随后在初始轮廓附近建立局部窄带
- 全文：上述问题,该文提出一种基于局部窄带的ACM边缘提取算法,并将其应用于Sentinel-1A获取的鄱阳湖水域时序观测图像中。该算法首先采用两级Otsu方法获取初始轮廓,随后在初始轮廓附近建立局部窄带
- 高原湖泊和平原湖泊遥感动态监测的对比分析——以洱海和鄱阳湖为例
- 作者： 王琳 赵志芳 来源：湿地科学与管理 年份：2016 文献类型 ：期刊 关键词： 高原湖泊 遥感动态监测 平原湖泊 鄱阳湖 洱海 湖泊信息提取
- 描述：湖泊及其动态变化在区域生态环境保护中占据极其重要的作用，监测并对比分析不同类型的湖泊动态变化对区域生态环境保护意义重大。应用Landsat TM 遥感数据，基于ENVI遥感图像处理软件和ArcGIS
- 全文：湖泊及其动态变化在区域生态环境保护中占据极其重要的作用，监测并对比分析不同类型的湖泊动态变化对区域生态环境保护意义重大。应用Landsat TM 遥感数据，基于ENVI遥感图像处理软件和ArcGIS
- 鄱阳湖流域史前人类遗址时空分布及其环境响应
- 作者： 徐佳佳 贾玉连 马春梅 朱诚 吴立 李育远 王鑫浩 来源：地理学报(英文版) 年份：2016 文献类型 ：期刊 关键词： expanded northward geographic records 环境响应 鄱阳湖流域 climatic ancient Holocene southeast
- 描述：The temporal-spatial geographic distribution of archaeological sites and its feature between 10.0–2.8 ka BP(ka BP= thousands of years before 0 BP, where “0 BP” is defined as the year AD 1950) were determined, based on GIS spatial analysis in the Poyang Lake Basin. The relationship between geographic distribution of sites of different periods under subsistence existence of ancient civilizations, climate and environmental change was investigated. The results revealed numerous archaeological sites of the Neolithic Age(10.0–3.6 ka BP). The sites were mainly located in the northern part of the Poyang Lake Basin, a hilly and mountainous area with many river terraces suitable for the development of human civilization. The number of archaeological sites rapidly increased during the Shang and Zhou dynasties(3.6–2.8 ka BP) and spread widely on the floodplains of the middle and lower reaches of Ganjiang River and onto the west, south, and southeast beach areas of the Poyang Lake. Holocene records of climate change suggested that it was possible that climate fluctuations had a great impact on human evolution in the study area. Before 3.6 ka BP, westward and northward expansion of Neolithic cultures in the Poyang Lake watershed occurred under the background of climate amelioration(becoming warmer and wetter). The ancient people lived in the hilly areas with high elevation. The simple mode of a fishing and gathering economy was mostly suited to this area in the early Neolithic Age. The scope of human activities was expanded and cultural diversity developed in the late Neolithic Age. However, with population growth and increasing survival pressure in a dry-cold climatic stage after 3.6 ka BP, this simple living mode had to be abandoned, and various forms of economy, the majority being agriculture, were developed on flood plains of the lower reaches of numerous rivers around Poyang Lake. This promoted flourishing of the Bronze culture of South China.
- 全文：The temporal-spatial geographic distribution of archaeological sites and its feature between 10.0–2.8 ka BP(ka BP= thousands of years before 0 BP, where “0 BP” is defined as the year AD 1950) were determined, based on GIS spatial analysis in the Poyang Lake Basin. The relationship between geographic distribution of sites of different periods under subsistence existence of ancient civilizations, climate and environmental change was investigated. The results revealed numerous archaeological sites of the Neolithic Age(10.0–3.6 ka BP). The sites were mainly located in the northern part of the Poyang Lake Basin, a hilly and mountainous area with many river terraces suitable for the development of human civilization. The number of archaeological sites rapidly increased during the Shang and Zhou dynasties(3.6–2.8 ka BP) and spread widely on the floodplains of the middle and lower reaches of Ganjiang River and onto the west, south, and southeast beach areas of the Poyang Lake. Holocene records of climate change suggested that it was possible that climate fluctuations had a great impact on human evolution in the study area. Before 3.6 ka BP, westward and northward expansion of Neolithic cultures in the Poyang Lake watershed occurred under the background of climate amelioration(becoming warmer and wetter). The ancient people lived in the hilly areas with high elevation. The simple mode of a fishing and gathering economy was mostly suited to this area in the early Neolithic Age. The scope of human activities was expanded and cultural diversity developed in the late Neolithic Age. However, with population growth and increasing survival pressure in a dry-cold climatic stage after 3.6 ka BP, this simple living mode had to be abandoned, and various forms of economy, the majority being agriculture, were developed on flood plains of the lower reaches of numerous rivers around Poyang Lake. This promoted flourishing of the Bronze culture of South China.
- 鄱阳湖洲滩优势植物种群的分布格局
- 作者： 葛刚 赵安娜 钟义勇 吴志强 来源：湿地科学 年份：2011 文献类型 ：期刊 关键词： 分布格局 鄱阳湖 湿地 植物种群
- 描述：根据野外样地调查数据,应用方差均值比率法、聚集强度指数法和相关分析法,对鄱阳湖洲滩优势植物种群分布格局进行了研究,分析了其形成的原因,并比较了各指数间的关系。结果表明,鄱阳湖洲滩优势植物种群都为聚集分布,它们的聚集强度存在差异,聚集度最高的是糙叶苔草(Carex scabrifolia),最小的是稻槎菜(Lapsana apogonoides),以根茎繁殖的多年生植物的聚集度要高于以种子繁殖的一年生植物;在空间上,洲滩植物种沿水分梯度呈现有规律的分布,与湿地土壤的沉积类型也有一定关系;湿地植物的克隆繁殖特性和对水分梯度的依赖性是种群分布格局形成的主要原因。
- 全文：根据野外样地调查数据,应用方差均值比率法、聚集强度指数法和相关分析法,对鄱阳湖洲滩优势植物种群分布格局进行了研究,分析了其形成的原因,并比较了各指数间的关系。结果表明,鄱阳湖洲滩优势植物种群都为聚集分布,它们的聚集强度存在差异,聚集度最高的是糙叶苔草(Carex scabrifolia),最小的是稻槎菜(Lapsana apogonoides),以根茎繁殖的多年生植物的聚集度要高于以种子繁殖的一年生植物;在空间上,洲滩植物种沿水分梯度呈现有规律的分布,与湿地土壤的沉积类型也有一定关系;湿地植物的克隆繁殖特性和对水分梯度的依赖性是种群分布格局形成的主要原因。
- 鄱阳湖鲌属(Culter)和原鲌属(Culterichthys)鱼类体重与体维关系
- 作者： 张小谷 熊邦喜 来源：湖泊科学 年份：2007 文献类型 ：期刊 关键词： 体重 鲌属 鄱阳湖 体维 原鲌属
- 描述：实测和回归分析鄱阳湖鲌属(Culter)的翘嘴鲌(C.alburnus)、蒙古鲌(C. mongolicus)、达氏鲌(C.dabryi)和原鲌属(Culterichthys)的红鳍原鲌(C. erythropterus)体重与体维关系.结果表明,多元回归方程能全面地反映不同体维对鱼类体重的影响,体重与体侧面积体厚的回归方程较适宜.其体重(W)与体侧面积(A)及体厚(T)的幂函数关系式分别是,翘嘴鲌:W=4.05051×10-3A0.66260T1.41994;蒙古鲌:W=3.18603×10-3A0.66845 T1.44376;达氏鲌:W=1.99310×10-3A0.70982T1.47305;红鳍原鲌:W=3.58823×10-3A0.63253T1.49465.
- 全文：实测和回归分析鄱阳湖鲌属(Culter)的翘嘴鲌(C.alburnus)、蒙古鲌(C. mongolicus)、达氏鲌(C.dabryi)和原鲌属(Culterichthys)的红鳍原鲌(C. erythropterus)体重与体维关系.结果表明,多元回归方程能全面地反映不同体维对鱼类体重的影响,体重与体侧面积体厚的回归方程较适宜.其体重(W)与体侧面积(A)及体厚(T)的幂函数关系式分别是,翘嘴鲌:W=4.05051×10-3A0.66260T1.41994;蒙古鲌:W=3.18603×10-3A0.66845 T1.44376;达氏鲌:W=1.99310×10-3A0.70982T1.47305;红鳍原鲌:W=3.58823×10-3A0.63253T1.49465.
- 鄱阳湖流域生态系统水源涵养量估算
- 作者： 杨帆 来源：内蒙古师范大学 年份：2016 文献类型 ：学位论文 关键词： LAI反演 统计模型 Landsat8 PROSAIL模型 OLI
- 描述：,对植被气候关系、全球气候变化研究等具有重要意义。内蒙古草原属于代表性温带草原生态类型,在温带草原中具有代表性。本研究选取Landsat8-OLI数据为基础数据,对内蒙古草原LAI采用统计模型
- 全文：,对植被气候关系、全球气候变化研究等具有重要意义。内蒙古草原属于代表性温带草原生态类型,在温带草原中具有代表性。本研究选取Landsat8-OLI数据为基础数据,对内蒙古草原LAI采用统计模型