全文获取类型
收费全文 | 917篇 |
免费 | 8篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 27篇 |
废物处理 | 53篇 |
环保管理 | 94篇 |
综合类 | 143篇 |
基础理论 | 204篇 |
环境理论 | 2篇 |
污染及防治 | 302篇 |
评价与监测 | 55篇 |
社会与环境 | 58篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 3篇 |
2022年 | 15篇 |
2021年 | 17篇 |
2020年 | 8篇 |
2019年 | 8篇 |
2018年 | 29篇 |
2017年 | 36篇 |
2016年 | 36篇 |
2015年 | 31篇 |
2014年 | 30篇 |
2013年 | 93篇 |
2012年 | 47篇 |
2011年 | 73篇 |
2010年 | 56篇 |
2009年 | 55篇 |
2008年 | 66篇 |
2007年 | 53篇 |
2006年 | 47篇 |
2005年 | 31篇 |
2004年 | 29篇 |
2003年 | 31篇 |
2002年 | 19篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 6篇 |
1998年 | 8篇 |
1997年 | 9篇 |
1996年 | 4篇 |
1995年 | 12篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1987年 | 2篇 |
1981年 | 3篇 |
1965年 | 7篇 |
1964年 | 3篇 |
1963年 | 4篇 |
1962年 | 9篇 |
1961年 | 11篇 |
1960年 | 1篇 |
1958年 | 2篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1954年 | 1篇 |
1947年 | 1篇 |
1942年 | 1篇 |
1941年 | 2篇 |
1938年 | 1篇 |
1932年 | 1篇 |
排序方式: 共有940条查询结果,搜索用时 15 毫秒
421.
Tissue-specific congener composition of organohalogen and metabolite contaminants in East Greenland polar bears (Ursus maritimus) 总被引:1,自引:0,他引:1
Gebbink WA Sonne C Dietz R Kirkegaard M Riget FF Born EW Muir DC Letcher RJ 《Environmental pollution (Barking, Essex : 1987)》2008,152(3):621-629
Congener patterns of the major organohalogen contaminant classes of PCBs, PBDEs and their metabolites and/or by-products (OH-PCBs, MeSO2-PCBs, OH-PBDEs and MeO-PBDEs) were examined in adipose tissue, liver, brain and blood of East Greenland polar bears (Ursus maritimus). PCB, OH-PCB, MeSO2-PCB and PBDE congener patterns showed significant differences (p相似文献
422.
Response patterns in adult forest trees to chronic ozone stress: identification of variations and consistencies 总被引:1,自引:0,他引:1
Nunn AJ Reiter IM Häberle KH Langebartels C Bahnweg G Pretzsch H Sandermann H Matyssek R 《Environmental pollution (Barking, Essex : 1987)》2005,136(3):365-369
The responsiveness of adult beech and spruce trees to chronic O(3) stress was studied at a free-air O(3) exposure experiment in Freising/Germany. Over three growing seasons, gas exchange characteristics, biochemical parameters, macroscopic O(3) injury and the phenology of leaf organs were investigated, along with assessments of branch and stem growth as indications of tree performance. To assess response pattern to chronic O(3) stress in adult forest trees, we introduce a new evaluation approach, which provides a comprehensive, readily accomplishable overview across several tree-internal scaling levels, different canopy regions and growing seasons. This new approach, based on a three-grade colour coding, combines statistical analysis and the proficient ability of the "human eye" in pattern recognition. 相似文献
423.
David J. Marcogliese Christian Blaise Daniel Cyr Yves de Lafontaine Michel Fournier Fran?ois Gagné Christian Gagnon Christiane Hudon 《Ambio》2015,44(4):257-274
The St. Lawrence River (SLR) is the second largest waterway in North America. The discharge of the City of Montreal wastewater treatment plant (WWTP) represents the largest volume of treated wastewaters being released into the river. It also ranks as the largest sewage treatment plant of its kind in North America. Over the last decade, intensive multidisciplinary research has focused on assessing the impacts of Montreal wastewater effluents on the SLR. We describe the major findings of these investigations, including the determination of the fate of contaminants, bioaccumulation in fish and invertebrates, ecotoxicological measurements of aquatic animal health, evaluation of endocrine disruption, parasitism in fish, and combined effects of multiple stressors on the SLR. Impacts of the effluents from the WWTP on aquatic organisms from the SLR are both toxicological and ecological, demonstrating the need for an integrated view of the impacts of municipal effluents on aquatic ecosystems. 相似文献
424.
425.
Arctic marine mammal population status,sea ice habitat loss,and conservation recommendations for the 21st century
下载免费PDF全文
![点击此处可从《Conservation biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Kristin L. Laidre Harry Stern Kit M. Kovacs Lloyd Lowry Sue E. Moore Eric V. Regehr Steven H. Ferguson Øystein Wiig Peter Boveng Robyn P. Angliss Erik W. Born Dennis Litovka Lori Quakenbush Christian Lydersen Dag Vongraven Fernando Ugarte 《Conservation biology》2015,29(3):724-737
Arctic marine mammals (AMMs) are icons of climate change, largely because of their close association with sea ice. However, neither a circumpolar assessment of AMM status nor a standardized metric of sea ice habitat change is available. We summarized available data on abundance and trend for each AMM species and recognized subpopulation. We also examined species diversity, the extent of human use, and temporal trends in sea ice habitat for 12 regions of the Arctic by calculating the dates of spring sea ice retreat and fall sea ice advance from satellite data (1979–2013). Estimates of AMM abundance varied greatly in quality, and few studies were long enough for trend analysis. Of the AMM subpopulations, 78% (61 of 78) are legally harvested for subsistence purposes. Changes in sea ice phenology have been profound. In all regions except the Bering Sea, the duration of the summer (i.e., reduced ice) period increased by 5–10 weeks and by >20 weeks in the Barents Sea between 1979 and 2013. In light of generally poor data, the importance of human use, and forecasted environmental changes in the 21st century, we recommend the following for effective AMM conservation: maintain and improve comanagement by local, federal, and international partners; recognize spatial and temporal variability in AMM subpopulation response to climate change; implement monitoring programs with clear goals; mitigate cumulative impacts of increased human activity; and recognize the limits of current protected species legislation. 相似文献
426.
427.
428.
429.
Christian Junge 《Die Naturwissenschaften》1981,68(5):236-244
The formation of the atmosphere-together with that of the oceans and sediments-was determined by three important processes: the loss of noble gases and volatiles in the solar nebula, the enrichment of these substances at the Earth's surface by exhalation from the Earth's mantle, and finally the formation of the hydrosphere, enabled by-in contrast to our neighboring planets-a suitable distance from the sun. In this way the development of the atmospheric gases N2, H2O and CO2 was largely fixed. Oxygen, on the other hand, appeared late in the atmosphere. It originated from biological photosynthesis which apparently developed rather early in the Earth's history but lead at first only to oxidation of iron and sulfur. The subsequently occurring accumulation of free oxygen in the atmosphere resulted in interesting interrelations with the development of life. 相似文献
430.
Nonylphenols and nonylphenolethoxylates with one, two, and three oxyethylene groups were identified in effluents from activated sludge sewage treatment plants. The complex mixtures of isomers are considered to be refractory metabolites of nonionic detergents. 相似文献