全文获取类型
收费全文 | 458篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 10篇 |
环保管理 | 23篇 |
综合类 | 116篇 |
基础理论 | 140篇 |
污染及防治 | 143篇 |
评价与监测 | 11篇 |
社会与环境 | 11篇 |
灾害及防治 | 1篇 |
出版年
2021年 | 2篇 |
2018年 | 5篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 14篇 |
2012年 | 18篇 |
2011年 | 19篇 |
2010年 | 12篇 |
2009年 | 27篇 |
2008年 | 19篇 |
2007年 | 24篇 |
2006年 | 26篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 23篇 |
2002年 | 12篇 |
2001年 | 9篇 |
2000年 | 20篇 |
1999年 | 25篇 |
1998年 | 19篇 |
1997年 | 18篇 |
1996年 | 17篇 |
1995年 | 13篇 |
1994年 | 8篇 |
1993年 | 12篇 |
1992年 | 3篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 4篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1974年 | 2篇 |
1970年 | 2篇 |
1967年 | 4篇 |
1966年 | 2篇 |
1965年 | 4篇 |
1961年 | 2篇 |
1958年 | 2篇 |
1956年 | 2篇 |
1955年 | 3篇 |
1952年 | 2篇 |
1949年 | 2篇 |
1922年 | 1篇 |
排序方式: 共有461条查询结果,搜索用时 15 毫秒
21.
Peter Wycisk Reiner Stollberg Christian Neumann Wolfgang Gossel Holger Weiss Roland Weber 《Environmental science and pollution research international》2013,20(4):1907-1917
A large-scale groundwater contamination characterises the Pleistocene groundwater system of the former industrial and abandoned mining region Bitterfeld/Wolfen, Eastern Germany. For more than a century, local chemical production and extensive lignite mining caused a complex contaminant release from local production areas and related dump sites. Today, organic pollutants (mainly organochlorines) are present in all compartments of the environment at high concentration levels. An integrated methodology for characterising the current situation of pollution as well as the future fate development of hazardous substances is highly required to decide on further management and remediation strategies. Data analyses have been performed on regional groundwater monitoring data from about 10 years, containing approximately 3,500 samples, and up to 180 individual organic parameters from almost 250 observation wells. Run-off measurements as well as water samples were taken biweekly from local creeks during a period of 18 months. A kriging interpolation procedure was applied on groundwater analytics to generate continuous distribution patterns of the nodal contaminant samples. High-resolution geological 3-D modelling serves as a database for a regional 3-D groundwater flow model. Simulation results support the future fate assessment of contaminants. A first conceptual model of the contamination has been developed to characterise the contamination in regional surface waters and groundwater. A reliable explanation of the variant hexachlorocyclohexane (HCH) occurrence within the two local aquifer systems has been derived from the regionalised distribution patterns. Simulation results from groundwater flow modelling provide a better understanding of the future pollutant migration paths and support the overall site characterisation. The presented case study indicates that an integrated assessment of large-scale groundwater contaminations often needs more data than only from local groundwater monitoring. The developed methodology is appropriate to assess POP-contaminated mega-sites including, e.g. HCH deposits. Although HCH isomers are relevant groundwater pollutants at this site, further organochlorine pollutants are present at considerably higher levels. The study demonstrates that an effective evaluation of the current situation of contamination as well as of the related future fate development requires detailed information of the entire observed system. 相似文献
22.
23.
Long-term effects of clear-cutting and selective cutting on soil methane fluxes in a temperate spruce forest in southern Germany 总被引:1,自引:0,他引:1
Wu X Brüggemann N Gasche R Papen H Willibald G Butterbach-Bahl K 《Environmental pollution (Barking, Essex : 1987)》2011,159(10):2467-2475
Based on multi-year measurements of CH4 exchange in sub-daily resolution we show that clear-cutting of a forest in Southern Germany increased soil temperature and moisture and decreased CH4 uptake. CH4 uptake in the first year after clear-cutting (−4.5 ± 0.2 μg C m−2 h−1) was three times lower than during the pre-harvest period (−14.2 ± 1.3 μg C m−2 h−1). In contrast, selective cutting did not significantly reduce CH4 uptake. Annual mean uptake rates were −1.18 kg C ha−1 yr−1 (spruce control), −1.16 kg C ha−1 yr−1 (selective cut site) and −0.44 kg C ha−1 yr−1 (clear-cut site), respectively. Substantial seasonal and inter-annual variations in CH4 fluxes were observed as a result of significant variability of weather conditions, demonstrating the need for long-term measurements. Our findings imply that a stepwise selective cutting instead of clear-cutting may contribute to mitigating global warming by maintaining a high CH4 uptake capacity of the soil. 相似文献
24.
Christian Sartorius Thomas Hillenbrand Rainer Walz 《Regional Environmental Change》2011,11(2):377-391
As a leading nutrient emitter, wastewater infrastructure harbors significant technical potentials to reduce the water-polluting
emissions of phosphorus and nitrogen into the Elbe river basin. From the viewpoint of the central infrastructure, the effluent
threshold value of urban wastewater treatment plants could be lowered further by advanced use of denitrification and membrane
filtration, and storm water overflows of wastewater and contaminated rainwater from sewers could be treated in retention soil
filters. In addition, small-scale wastewater treatment plants, infiltration and reducing or unsealing impervious surfaces
could be used as decentralized elements of wastewater or storm water treatment. It can be shown that if the most advanced
measures were applied in all wastewater-relevant areas, up to 60% of the phosphorus and 37% of the nitrogen emissions could
be avoided. Alongside central wastewater treatment plants, small-scale treatment plants prove to be the most effective and
cost-efficient option. To achieve an ecologically acceptable state of the Elbe, however, it may be necessary to employ more
costly measures as well. 相似文献
25.
Augustine A. Ayantunde Rainer Asse Mohammed Y. Said Abdou Fall 《Environment, Development and Sustainability》2014,16(5):1097-1117
Transhumant pastoralism is one of the dominant livestock production systems in West Africa, and it is characterized by seasonal and cyclical movement of varying degrees between complementary ecological areas. The common pattern of transhumance is moving herds from areas with pasture and water scarcity such as the Sahelian zone to areas where the forage and water are found, often in the sub-humid zone. Whereas the transhumant herds from the Sahel are mainly Zebu breeds, endemic ruminant livestock (ERL) are the dominant breeds in sub-humid zone of West Africa because of their tolerance to tsetse-borne trypanosomosis disease. These livestock fulfill different functions in the livelihood of rural communities in the region. To identify potential areas of interventions for sustainable natural resource management to improve ERL productivity, a desk study that included spatial mapping was performed to review and document the existing knowledge on transhumance in West Africa. Additionally, group discussions were held to analyze the (actual or potential) effects of transhumant herds on natural resource management and ERL in the sub-humid zone. This study covered sub-humid zone in The Gambia, Guinea, Mali and Senegal. The key question we addressed in this study was as follows: What are the key trends and changes in transhumant pastoralism and how do these impact sustainable management of natural resources including endemic livestock? The results of the desk study and group discussions showed that there have been more southerly movements by transhumant pastoralists into the sub-humid zone over the past three decades and this has contributed to growing competition for grazing resources. The presence of transhumant herds in the sub-humid zone has a potential impact on management and conservation of ERL through crossbreeding with transhumant Zebu breeds from the Sahel but only study sites in Mali showed a high risk. 相似文献
26.
27.
28.
2,2′-Dichlorodivinylarsine chloride (Lewisite II) react by room temperature quickly with alcohols in an equilibrium reaction to yield 2,2′-Dichlorodivinylarsine ether. The reactions are not quantitative. The methyl-, ethyl-and propylether are not stable. 相似文献
29.
30.