山东洞体应变观测质量分析     

李希亮  卢双苓  赵小贺  孟建国  李栋梁 《地震地磁观测与研究》2014,35(5):196-201

选取山东省3个洞体应变台2007-2011年观测数据,分析资料的完整性、内在质量及干扰因素.结果表明：①观测资料连续性和完整性较好;②仪器零漂满足设计指标要求;③M2波振幅因子相对误差和相对噪声水平达到Ⅰ类应变台标准;④仪器更新后观测质量提升;⑤洞体应变观测主要受仪器调修、气压、降雨和观测环境变化等因素影响.  相似文献   

Spatial–temporal variability in water quality and macro-invertebrate assemblages in the Upper Mara River basin,Kenya     

《Physics and Chemistry of the Earth》2014

Tropical rivers display profound temporal and spatial heterogeneity in terms of environmental conditions. This aspect needs to be considered when designing a monitoring program for water quality in rivers. Therefore, the physico-chemical composition and the nutrient loading of the Upper Mara River and its two main tributaries, the Amala and Nyangores were monitored. Initial daily, and later a weekly monitoring schedule for 4 months spanning through the wet and dry seasons was adopted. Benthic macro-invertebrates were also collected during the initial sampling to be used as indicators of water quality. The aim of the current study was to investigate the physico-chemical status and biological integrity of the Upper Mara River basin. This was achieved by examining trends in nutrient concentrations and analyzing the structure, diversity and abundance of benthic macro-invertebrates in relation to varying land use patterns. Sampling sites were selected based on catchment land use and the level of human disturbance, and using historical records of previous water quality studies. River water pH, dissolved oxygen, electrical conductivity (EC), temperature, and turbidity were determined in situ. All investigated parameters except iron and manganese had concentration values within allowable limits according to Kenyan and international standards for drinking water. The Amala tributary is more mineralized and also shows higher levels of pH and EC than water from the Nyangores tributary. The latter, however, has a higher variability in both the total phosphorus (TP) and total nitrogen (TN) concentrations. The variability in TP and TN concentrations increases downstream for both tributaries and is more pronounced for TN than for TP. Macro-invertebrate assemblages responded to the changes in land use and water quality in terms of community composition and diversity. The study recommends detailed continuous monitoring of the water quality at shorter time intervals and to identify key macro-invertebrate taxa that can be used to monitor changes of the water quality in rivers of the Mara basin as a result of anthropogenic changes.  相似文献   

Bacterial Proliferation in Municipal Water Supplied in Mirpur Locality of Dhaka City,Bangladesh          下载免费PDF全文

Mrityunjoy Acharjee  Farjana Rahman  Fahmida Jahan  Rashed Noor 《洁净——土壤、空气、水》2014,42(4):434-441

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Atmospheric Nitrogen and Phosphorus Deposition at Three Sites in Nanjing,China, and Possible Links to Nitrogen Deposition Sources   总被引：1，自引：0，他引：1       下载免费PDF全文

Liying Sun  Yinglie Liu  Jinyang Wang  Mohammad Aslam K. Khalil  Jianwen Zou  Zhengqin Xiong 《洁净——土壤、空气、水》2014,42(11):1650-1659

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Plasma‐Based Indoor Air Cleaning Technologies: The State of the Art‐Review          下载免费PDF全文

Mitra Bahri  Fariborz Haghighat 《洁净——土壤、空气、水》2014,42(12):1667-1680

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Variation of Pseudomonas aeruginosa in Rainwater Harvesting Systems: Effects of Seasons,Catchments and Storage Conditions          下载免费PDF全文

Mohsin Nawaz  Muhammad Tahir Amin  Mooyoung Han  Abdulrahman Ali Alazba  Umair Manzoor  Muhammad Nasir Amin 《洁净——土壤、空气、水》2014,42(7):893-900

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南洞流域东部重点区石漠化现状及治理对策   总被引：8，自引：6，他引：2  

覃星铭  蒋忠诚  何丙辉  劳文科  李衍青  赵一  蓝芙宁 《中国岩溶》2014,33(4):456-463

为了探讨南洞流域东部重点区石漠化现状及其治理对策,通过遥感数据分析结果并结合地面实地调查验证,对云南南洞流域东部重点区石漠化分布特征、成因、危害及其区域林地生态环境质量状况进行了分析。结果表明,南洞流域东部重点区石漠化面积占岩溶区面积的17.2%,集中分布于大庄盆地西北部,以轻度石漠化为主,轻度、中度、重度石漠化的面积比例约为7∶3∶1,石漠化与水土流失问题突出,岩溶区林地生态环境质量等级以三级、四级为主,占区域总面积的53.77%,整体水平较低,且明显低于区内的非岩溶地区林地。粗放型畜牧和农耕方式是导致区内石漠化形成和加剧的最重要因素。提出休垦弃焚、恢复次生植被、合理开发利用土地资源、优化农林畜牧产业结构,实施林草建设工程、草食畜牧业工程、水利水保设施工程,建立保障制度和监督机制,开展全面的石漠化综合治理对策,以确保区域生态恢复、农林畜牧经济健康发展及南洞地下河流域生态安全和水资源开发利用。   相似文献   

Research on Migration Features of Ammonia-Nitrogen in Shallow Groundwater of Coastal Area of Tangshan Fengnan     

Duo LI  Kang CHEN 《地下水科学与工程》2014,2(1):39-43

The ammonia-nitrogen in shallow groundwater of coastal area of Tangshan Fengnan exceeds the content limit at varying degrees. To analyze the the migration features of ammonia-nitrogen in the groundwater, a two-dimensional groundwater flow and quality model has been established on the basis of investigation and analysis of hydeogeological conditions in this region. Ammonia-nitrogen in the first aquifer groundwater migrates slowly and is difficult to diffuse during the migration process for the low exploitation, the small hydraulic gradient, the relatively fine aquier rock particles and poor permeability of the aquifer  相似文献   

沩水流域土地景观格局对河流水质的影响   总被引：4，自引：1，他引：3  

焦胜  杨娜  彭楷  郭谌达  李振民  周怀宇 《地理研究》2014,33(12):2263-2274

以红壤丘陵区沩水流域为研究区域,运用GIS空间分析及统计分析的方法,探讨了流域土地景观格局对河流水质的影响。结果表明：① 林地面积百分比与电导率(COND)、综合污染指数(Pr)相关性指数分别达-1.000、-0.997,呈显著负相关;耕地面积百分比与COND、总磷(TP)及土地利用程度综合指数(La)与COND、Pr呈显著正相关。② 斑块数量(NP)、香农多样性指数(SHDI)与COND、Pr相关性指数均在0.997以上,呈显著正相关;平均斑块面积(AREA_MN)、蔓延度指数(CONTAG)与COND、Pr及最大斑块指数(LPI)与TP呈显著负相关。③ 从时间上看,所选用的大部分土地景观格局指标与pH值、溶解氧(DO)在丰水期与枯水期的相关性状态相反,且枯水期土地景观格局对河流水质的影响较丰水期更为显著。  相似文献   

查干湖湿地水环境演变特征分析   总被引：1，自引：0，他引：1  

李然然  章光新  魏晓鸿  刘艳  张蕾  孙爽 《地理科学》2014,34(6):762-768

查干湖湿地是吉林西部重要的生态屏障,分析其水环境演变特征,可为保障其水环境安全提供科学依据。利用1982~2011年的水位资料和1985~2011年的水质资料分析其水环境演变特征,采用卡尔森指数法和模糊综合评价法对查干湖湿地进行综合营养状态和水质状况评价。结果显示引松工程通水后湿地水位得以恢复并稳定在129.8~130.3 m;20世纪80年代末湿地水环境大幅改善,水体盐碱化、富营养化、有机污染得以缓解,但2006年以来水质碱化和有机污染加剧,水质由Ⅲ类演变为IV类。现阶段农田退水缓解了主湖区的碱化且暂未加剧其水体富营养化。查干湖水受流域陆源排放、湖泊内源释放及水文情势等多重因素的交互作用,呈以磷素为限制的中营养状态,应控制区域生活污水和畜禽粪便的污染以保护其水环境健康。  相似文献