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排序方式: 共有60条查询结果,搜索用时 31 毫秒
1.
多氯联苯封存点土壤污染情况的调查监测   总被引:9,自引:1,他引:8  
通过对几个多氯联苯(PCBs)封存点土壤的调查监测,初步分析了PCBs的污染状况和潜在威胁。  相似文献
2.
X-荧光光谱法在土壤调查中的应用   总被引:4,自引:2,他引:2  
采用硼酸镶边、垫底压制土壤粉末样品,用X-荧光光谱仪分析其中铜、铅、铬、锌、镍等元素浓度。主要讨论了样品粒度对分析元素测定结果的影响。分析了标准样品及实际样品,其结果与标准值及化学法、原子吸收法测定结果相吻合。用土壤标准物质作精密度试验,统计结果表明,各组分RSD均小于3.74%。  相似文献
3.
武陵源风景名胜区水环境调查   总被引:3,自引:0,他引:3       下载免费PDF全文
对武陵源风景区水体富营养化现状和演变趋势进行了调查。结果表明,总磷为武陵源风景区水体首要污染因子;金鞭溪、索溪水库、索溪组成的主干水体已处于富营养化状态,且呈上升趋势。提出,彻底进行生态大拆迁,减少核心景区旅游接待和商业行为;建立用水价格市场体系,降低污水排放量;合理规划旅游接待区,推行绿色宾馆酒店建设,加强水污染治理,减少污染物排放量;加强科学投入,确定水环境容量,合理控制旅游容量,是根治景区水体富营氧化污染的有效途径。  相似文献
4.
建设项目竣工环境保护验收监测现场勘察   总被引:3,自引:2,他引:1       下载免费PDF全文
从资料收集、工程概况了解和现场察看3方面阐述了建设项目竣工环境保护验收监测现场勘察的具体步骤和内容。  相似文献
5.
中国土壤环境调查、评价与监测   总被引:3,自引:2,他引:1  
介绍了近半个多世纪以来中国土壤环境调查情况,对20世纪50年代、80年代全国土壤调查情况进行了描述,阐述了2006年以来全国土壤污染状况调查情况.结合土壤环境现状、土壤监测与评价存在的问题,对未来中国土壤监测规划进行了展望.提出了确定土壤环境监测国控点,构建国家土壤环境监测网,落实土壤环境例行监测的监测思路,以进一步推进土壤环境监测和保护.  相似文献
6.
IC色谱仪电位法测定S^2—的运用与研究   总被引:2,自引:0,他引:2  
介绍了应用YIC-8型离子色谱仪电化学检测器测定标准样品及废水样中S^2-的含量,同时与化学法进行比较,肯定了电位法的准确性、可靠性。  相似文献
7.
Watershed-Based Survey Designs   总被引:2,自引:0,他引:2  
Watershed-based sampling design and assessment tools help serve the multiple goals for water quality monitoring required under the Clean Water Act, including assessment of regional conditions to meet Section 305(b), identification of impaired water bodies or watersheds to meet Section 303(d), and development of empirical relationships between causes or sources of impairment and biological responses. Creation of GIS databases for hydrography, hydrologically corrected digital elevation models, and hydrologic derivatives such as watershed boundaries and upstream–downstream topology of subcatchments would provide a consistent seamless nationwide framework for these designs. The elements of a watershed-based sample framework can be represented either as a continuous infinite set defined by points along a linear stream network, or as a discrete set of watershed polygons. Watershed-based designs can be developed with existing probabilistic survey methods, including the use of unequal probability weighting, stratification, and two-stage frames for sampling. Case studies for monitoring of Atlantic Coastal Plain streams, West Virginia wadeable streams, and coastal Oregon streams illustrate three different approaches for selecting sites for watershed-based survey designs.  相似文献
8.
Rapid Assessment of Plant Diversity Patterns: A Methodology for Landscapes   总被引:2,自引:0,他引:2  
We present a rapid, cost-efficient methodology to link plantdiversity surveys from plots to landscapes using: (1) unbiasedsite selection based on remotely sensed information; (2) multi-scale field techniques to assess plant diversity; (3)mathematical models (species-area curves) to estimate thenumber of species in larger areas corrected for within-typeheterogeneity; and (4) mathematical techniques to estimatetotal species richness and patterns of plant diversity in alandscape. We demonstrate the methodology in a 754 ha studyarea in Rocky Mountain National Park, Colorado, U.S.A.,using four 0.025 ha and twenty-one 0.1 ha multi-scalevegetation plots. We recorded 330 plant species (1/3 thenumber of plants recorded in the 1074 km2 Park) in the2.2 ha area within the plots: this represents a samplingintensity of 0.29% of the 754 ha study site. We estimated 552plant species, about half the plant species recorded in the Park,in just 0.7% of the Parks area. We show how this rapid,cost-efficient methodology: (1) produces a rich informationbase on the patterns of native plant diversity and thedistribution of non-native plant species and keystoneecosystems; and (2) can be easily adapted for other nationaland state parks, national forests, wildlife refuges, and nature reserves.  相似文献
9.
Natural capital in ecology and economics: an overview   总被引:2,自引:0,他引:2  
The Brundtland Commission report, Our Common Future, defined sustainable development as development that meets the needs of the present without compromising the ability of futuregenerations to meet their own needs. Although the idea of sustainable development has been widely accepted, it has proveddifficult to identify and implement policies and practices thatpromote sustainable economic growth. Some economists, environmental scientists and policy analysts believe that they can transform the consensus about sustainability into manageablepractices. They propose to accomplish this feat with a set of new ideas about the relationships between the economy and theenvironment offered under the banner of 'natural capital'. An ideal account of natural capital would be one or more standard measures or models that would allow the direct comparison of environmental goods, like forests, fresh water and clean air, with economic goods, like money, capital and productivity. By bringing economic science and environmental science to an objective common ground, a natural capital model has the potentialto provide a concrete means of comparing the economic and ecological costs and benefits of particular policies and programmes. This paper offers a survey and analysis of several new contributions to the formation of the natural capital concept from economists, ecologists, policy analysts, biometricians, foresters and a philosopher. The paper concludes that existingmicroeconomic theory may be 'ungreenable', if it is not reformulated. While macroeconomic approaches to natural capitalhave been more successful, they share the limitation that ecosystems and species are valued solely in monetary terms. These problems are taken to suggest that the development of a successful natural capital model may require economic theory tobe recast to include non-monetary social preferences and values.  相似文献
10.
东平湖突发性水污染事故调查   总被引:2,自引:2,他引:0       下载免费PDF全文
东平县环境监测站从1996年开始,对每年发生的第一场洪水进行水质跟踪监测。结果表明,SS是主要污染物,涨洪段和洪峰段监测值分别超过《渔业水质标准》(GB1160789)181倍、215倍,TN的高峰值出现在退水段1和退水段2,分别超过《地表水环境质量标准》(GB38382002)Ⅲ级标准6 54倍、5 68倍,洪峰的COD监测值为133mg/L,超标5 65倍。洪水入湖后湖区水质监测结果表明,老湖镇入湖口河道污染最重,除上游洪水带入大量污染物外,洪水入湖后冲击养殖区,使大量含有机质的底质泛起,加重了入湖口附近的水污染。指出,悬浮物的骤然增加和溶解氧的持续过低,大汶河流域内地表水水质恶化以及养殖区规划不合理和养殖方式不当是导致污染事故发生的主要原因。  相似文献
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