Results 31 to 40 of about 538 (128)
Shuitu Baochi Xuebao, 2020 通过研究三峡水库坝区生态屏障区近25年来的土地利用变化，揭示其时空变化规律及驱动机制，为坝区生态屏障区土地资源的合理开发利用及生态系统管理提供科学依据。运用RS和GIS技术对1993年、2006年和2018年3期Landsat遥感影像进行处理，得到土地利用类型分布图；综合运用土地利用变化量、变化幅度和转移矩阵等定量指标，对三峡水库坝区生态屏障区1993—2018年间的土地利用变化进行分析。结果表明：1993年以来，三峡水库坝区生态屏障区土地利用结构变化明显，表现为林地、园地和水域的增加，耕地的大幅减少 ...
田培 +6 more
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, 2012 伴随着举世瞩目的三峡工程全面竣工,三峡水库于2010年正式进入年水位落差达30 m的正常运行阶段.水库湖沼学可为环境友好型大坝建设和水库可持续管理提供科学依据.本文在三峡成库8 a以来生态系统长期监测与研究的基础上,对三峡水库水环境现状进行了归纳和总结,分析了水环境动态的时空异质性、水库纵向分区与群落组成、垂向分布及藻类水华的成因和动态,并对三峡水库藻类水华预警与生态-水文调控机制展开了论述.最后,本文尝试给出以下两方面的展望:1)大型水库湖沼学观测研究应有长期的策略;2 ...
孙志禹, 蔡庆华
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Suitability analysis and recommendations for professional monitoring techniques and methods of landslides in the Three Gorges Reservoir: A case study of the Zigui section in Hubei Province [PDF]
The Three Gorges Reservoir area is one of the earliest regions in China to systematically implement professional monitoring and early warning for geological disasters such as landslides. Since the impoundment of the Three Gorges Reservoir in 2003, nearly
Guodong ZHANG +8 more
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Shuitu Baochi Xuebao, 2004 三峡工程建成蓄水后,受淹耕地将遭到江水浸泡,积蓄在耕地上的有机污染物、N、P以及Cu、Cr等微量重金属将通过溶解、交换、扩散而迁移到江水中,增加江水中相应成份的含量。在调查了解三峡库区受淹土壤数量、类型的基础上,选择采集具有代表性的8个耕作土壤作样本,在实验的条件下模拟江水浸泡,求取单位重量的土壤在固—液相平衡状态下释放污染物的负荷量,进而计算三峡库区受淹土壤在江水浸没处于平衡时污染物释放进入水中污染物的量。结果表明,三峡水库受淹耕地污染物释放总量为181540.9t,其中以CODcr,BCOD5为主 ...
杨钢
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Spatial Differentiation and Correlation of Ecological Stoichiometric Characteristics of Cynodon dactylon and Soil in the Water-level Fluctuation Zone of the Three Gorges Reservoir Area [PDF]
[Objective] Cynodon dactylon is an important component and the dominant species in the ecosystem of the water-level fluctuation zone (WLFZ) of the Three Gorges Reservoir, the largest hydropower project in the word.
JIAN Chen +4 more
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Study on algae-laden water treatment of dissolved air flotation integrated with ·OH strong oxidation [PDF]
, 2015 我国饮用水水源约有25%是湖泊水或河流库区水库水，高藻发生的频率与严重程度都呈现迅猛的增长趋势，因藻类大量繁殖引起的水源污染，造成自来水厂被迫减产或停产，严重地威胁城市供水和饮用水安全。本论文针对厦门九龙江北溪流域日益严峻的富营养化及水华爆发危及饮用水安全的重大问题，以大气压强电离放电生成羟基自由基(•OH)致死高藻水中藻类为核心，建立高效、经济、安全的高藻水处理的组合工艺，取得的主要成果如下： (1)以强电场电离放电产生•OH为核心，建立气浮-•OH强氧化组合工艺 ...
洪伟辰
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Heavy metal pollution in rural soil and ecological risk in Wanzhou District, Chongqing [PDF]
ObjectiveTo analyze and assess the pollution levels of lead (Pb), cadmium (Cd), and chromium (Cr) in rural soils of Wanzhou District, Chongqing Municipality, and to provide data support for proposing relevant measures and suggestions.MethodsBased on the ...
CHENG Longfeng +6 more
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Shuitu Baochi Xuebao, 2005 通过对三峡重庆库区16个区县，183个土壤样品的分析，表明三峡库区消落区土壤重金属含虽均达到国家土壤环境标准3级以上。其中Cu含量范围为10.7～80.2mg／kg，均值为37.0mg／kg；Pb含量范围为14.6～51.8mg／kg，均值为29.3mg／kg；Zn含量范围为47.5～93.3mg／kg，均值为72.7mg／kg；Cd含量范围为0.081～0.864mg／kg，均值为0.321mg／kg；Hg含量范围为0.032～0.204mg／kg，均值为0.059mg／kg；As含量范围为4.63 ...
黎莉莉 张晟 刘景红 赵秀兰 高吉喜
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Shuitu Baochi Xuebao, 2002 三峡库区湖岸带是水生生态系统和陆地生态系统的交接地带.湖岸带是十分重要的土地资源.但是,对三峡库区湖岸带土地资源必须合理开发利用,才能做到对湖岸带的保护.湖岸带土地资源的开发利用问题应该十分重视.在分析三峡库区湖岸带土地资源现状的基础上,提出三峡库区湖岸土地资源的合理开发利用和保护措施.
蔡书良 黄川
doaj
Characteristics of Land Use Change and Evaluation of Ecological Sensitivity in Chongqing [PDF]
[Objective] Chongqing, as the economic center of the upper reaches of the Yangtze River in China and a barrier to ensure ecological security in the middle and lower reaches of the Yangtze River, is a typical ecological functional and fragile area in ...
GOU Qiantao, WU Han, XIE Xianjian
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