全文获取类型
收费全文 | 28415篇 |
免费 | 392篇 |
国内免费 | 471篇 |
专业分类
安全科学 | 924篇 |
废物处理 | 1024篇 |
环保管理 | 4221篇 |
综合类 | 5773篇 |
基础理论 | 7069篇 |
环境理论 | 13篇 |
污染及防治 | 7311篇 |
评价与监测 | 1464篇 |
社会与环境 | 1293篇 |
灾害及防治 | 186篇 |
出版年
2022年 | 217篇 |
2021年 | 218篇 |
2020年 | 222篇 |
2019年 | 212篇 |
2018年 | 377篇 |
2017年 | 365篇 |
2016年 | 560篇 |
2015年 | 454篇 |
2014年 | 621篇 |
2013年 | 2217篇 |
2012年 | 854篇 |
2011年 | 1239篇 |
2010年 | 924篇 |
2009年 | 1071篇 |
2008年 | 1197篇 |
2007年 | 1252篇 |
2006年 | 1075篇 |
2005年 | 867篇 |
2004年 | 889篇 |
2003年 | 858篇 |
2002年 | 800篇 |
2001年 | 1012篇 |
2000年 | 771篇 |
1999年 | 490篇 |
1998年 | 334篇 |
1997年 | 356篇 |
1996年 | 371篇 |
1995年 | 411篇 |
1994年 | 386篇 |
1993年 | 359篇 |
1992年 | 339篇 |
1991年 | 339篇 |
1990年 | 354篇 |
1989年 | 344篇 |
1988年 | 297篇 |
1987年 | 270篇 |
1986年 | 277篇 |
1985年 | 291篇 |
1984年 | 310篇 |
1983年 | 285篇 |
1982年 | 307篇 |
1981年 | 301篇 |
1980年 | 260篇 |
1979年 | 268篇 |
1978年 | 221篇 |
1977年 | 204篇 |
1976年 | 198篇 |
1974年 | 215篇 |
1973年 | 187篇 |
1972年 | 190篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
301.
N. Dolgener L. Freudenberger N. Schneeweiss P. L. Ibisch R. Tiedemann 《Regional Environmental Change》2014,14(3):1063-1072
Environmental change is likely to have a strong impact on biodiversity, and many species may shift their distribution in response. In this study, we aimed at projecting the availability of suitable habitat for an endangered amphibian species, the Fire-bellied toad Bombina bombina, in Brandenburg (north-eastern Germany). We modelled a potential habitat distribution map based on (1) a database with 10,581 presence records for Bombina from the years 1990 to 2009, (2) current estimates for ecogeographical variables (EGVs) and (3) the future projection of these EGVs according to the statistical regional model, respectively, the soil and water integrated model, applying the maximum entropy approach (Maxent). By comparing current and potential future distributions, we evaluated the projected change in distribution of suitable habitats and identified the environmental variables most associated with habitat suitability that turned out to be climatic variables related to the hydrological cycle. Under the applied scenario, our results indicate increasing habitat suitability in many areas and an extended range of suitable habitats. However, even if the environmental conditions in Brandenburg may change as predicted, it is questionable whether the Fire-bellied toad will truly benefit, as dispersal abilities of amphibian species are limited and strongly influenced by anthropogenic disturbances, that is, intensive agriculture, habitat destruction and fragmentation. Furthermore, agronomic pressure is likely to increase on productive areas with fertile soils and high water retention capacities, indeed those areas suitable for B. bombina. All these changes may affect temporary pond hydrology as well as the reproductive success and breeding phenology of toads. 相似文献
302.
303.
Probabilistic impacts of climate change on flood frequency using response surfaces II: Scotland 总被引:1,自引:0,他引:1
A. L. Kay S. M. Crooks H. N. Davies N. S. Reynard 《Regional Environmental Change》2014,14(3):1243-1255
This paper uses a sensitivity framework approach to look at the probabilistic impacts of climate change on 20-year return period flood peaks, by applying a set of typical response surfaces alongside the probabilistic UK Climate Projections (UKCP09) for 10 river-basin regions over Scotland. The first paper of the pair used the same approach for 10 river-basin regions over England and Wales. This paper develops the methodology for Scotland, by first enabling better estimation of the response type of Scottish catchments. Then, as for England and Wales, the potential range of impacts is shown for different types of catchment in each river-basin region in Scotland, and regional average impact ranges are estimated. Results show clear differences in impacts between catchments of different types and between regions. The Argyll and West Highland regions show the highest impacts, while the North-East Scotland region shows the lowest impacts. The overall ranges are generally smaller for Scotland than England and Wales. 相似文献
304.
Fielding JL 《Disasters》2012,36(3):477-494
This paper explores the environmental inequalities of living in the floodplains of England and Wales and the differences in flood awareness of those 'at risk'. An area comparison is made between an etic, objective flood risk exposure, and an emic, subjective perception of that risk by social class. In all areas except the Midlands, the working classes were more likely to reside in the floodplains; the greatest exposure inequality is seen in the North East and Anglian regions. Flood awareness in the Anglian regions was much lower than average, but there were no significant class differences. In the Thames region, despite equal flood risk exposure between classes, the most deprived displayed the least awareness of flood risk. In the North East, inequalities in the distribution of flood risk exposure accompanied inequalities in perception, resulting in the least aware and most deprived experiencing the greatest flood risk. 相似文献
305.
Gabriel N. de O. Teixeira Arthur M. S. da Cruz Gisella R. L. Samanamud Alexandre B. França Luzia L. R. Naves Diego Melo 《Journal of environmental science and health. Part. B》2020,55(1):19-29
AbstractThe main objective of this study is the degradation of a synthetic solution of atrazine by a modified vermiculite catalyzed ozonation, in a rotating packed bed (RPB) reactor. A 0.5?L RPB reactor was used to perform the experiments, using a Central Composite Design (CCD) response surface to construct the quadratic model based on the factors: pH, catalyst concentration and reactor rotation frequency. The response variable was the removal of the organic load measured in terms of Chemical Oxygen Demand (COD). After the complete quadratic model was constructed through the response surface, the COD degradation process had an optimal removal of 41% under the following conditions: pH 8.0, rotation of 1150?rpm and catalyst concentration 0.66?g L?1. 相似文献
306.
307.
Atiaga Oliva Nunes Luis M. Otero Xosé L. 《Environmental science and pollution research international》2020,27(10):10757-10765
Environmental Science and Pollution Research - This study assessed the effect of rinsing and boiling on total content of As (tAs) and of its inorganic and organic forms in different types of rice... 相似文献
308.
309.
310.
The growth of was significantly inhibited by Cd2+ concentrations greater than 0.02 ppm (μg/ml) and completely inhibited at 0.06 ppm (Day 12). Cadmium had no significant effect upon the lag phase of growth or the culture doubling time, but caused the retardation phase to arrive sooner. One ppm Cd2+ significantly inhibited the rates of both photosynthesis and acetylene reduction, by . , with complete inhibition at 4 and 20 ppm respectively. Cell sensitivity increased directly with exposure time. Cadmium caused some cell lysis of . and induced an increase in filament length, heterocyst frequency, and a loss of cellular contents from filament apical cells. The cellular abnormalities observed and the fact that toxicity increased with longer exposure times, suggested that metal toxicity resulted from effects of Cd2+ taken up by cells rather than Cd2+ at the cell surface. 相似文献