全文获取类型
收费全文 | 305篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 22篇 |
环保管理 | 26篇 |
综合类 | 52篇 |
基础理论 | 56篇 |
污染及防治 | 96篇 |
评价与监测 | 30篇 |
社会与环境 | 22篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 5篇 |
2022年 | 19篇 |
2021年 | 22篇 |
2020年 | 9篇 |
2019年 | 4篇 |
2018年 | 11篇 |
2017年 | 18篇 |
2016年 | 23篇 |
2015年 | 15篇 |
2014年 | 19篇 |
2013年 | 31篇 |
2012年 | 13篇 |
2011年 | 16篇 |
2010年 | 15篇 |
2009年 | 10篇 |
2008年 | 11篇 |
2007年 | 18篇 |
2006年 | 13篇 |
2005年 | 10篇 |
2004年 | 6篇 |
2003年 | 2篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 4篇 |
1993年 | 2篇 |
1985年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有309条查询结果,搜索用时 187 毫秒
41.
Farjalla VF Srivastava DS Marino NA Azevedo FD Dib V Lopes PM Rosado AS Bozelli RL Esteves FA 《Ecology》2012,93(7):1752-1759
After much debate, there is an emerging consensus that the composition of many ecological communities is determined both by species traits, as proposed by niche theory, as well as by chance events. A critical question for ecology is, therefore, which attributes of species predict the dominance of deterministic or stochastic processes. We outline two hypotheses by which organism size could determine which processes structure ecological communities, and we test these hypotheses by comparing the community structure in bromeliad phytotelmata of three groups of organisms (bacteria, zooplankton, and macroinvertebrates) that encompass a 10 000-fold gradient in body size, but live in the same habitat. Bacteria had no habitat associations, as would be expected from trait-neutral stochastic processes, but still showed exclusion among species pairs, as would be expected from niche-based processes. Macroinvertebrates had strong habitat and species associations, indicating niche-based processes. Zooplankton, with body size between bacteria and macroinvertebrates, showed intermediate habitat associations. We concluded that a key niche process, habitat filtering, strengthened with organism size, possibly because larger organisms are both less plastic in their fundamental niches and more able to be selective in dispersal. These results suggest that the relative importance of deterministic and stochastic processes may be predictable from organism size. 相似文献
42.
Leonardo K. Miyashita Mayza Pompeu Salvador A. Gaeta Rubens M. Lopes 《Marine Biology》2010,157(11):2511-2519
We studied the population dynamics and the reproductive biology of Penilia avirostris during three consecutive years on the inner shelf off Ubatuba, Brazil. Penilia avirostris individuals and its eggs and embryos were counted, measured, and classified into stages. The species occurred throughout
the studied period, in a wide temperature range (14.8–28.2°C). Cladoceran densities were usually higher (>2,000 ind m−3) in warm seasons, when the water column was stratified as a consequence of bottom intrusions of the cold- and nutrient-rich
South Atlantic Central Water. Juveniles, non-reproducing females, and parthenogenic females were the dominant developmental
stages. Males and gamogenic females were rare and only occurred when females reached peak abundances. This suggests that in
tropical and subtropical coastal seas gamogenesis in P. avirostris is not as common as in temperate seas, but may play a significant role in the density-dependent control of the population
preceding unfavourable periods. 相似文献
43.
Biljana Blaževska Stoilkovska Valentina Žileska Pančovska Goran Mijoski 《International journal of occupational safety and ergonomics》2013,19(4):440-447
This study examines the degree to which construction sector employees perceive that safety is important in their organizations/sites and how job satisfaction affects these perceptions when age is introduced as a moderator variable. Two-way analysis of variance demonstrated that job satisfaction has a strong effect on perceived management commitment to work safety and that this relationship was moderated by respondents’ age. Job satisfaction was associated with perceived accident rate and safety inspection frequency, but the proposed role of age in this linkage was not confirmed. Consequently, the findings indicated that by increasing the level of job satisfaction, perceptions of these safety climate aspects proved to be more positive. The conclusion is that these relationships could further lead to a lower percentage of accidents and injuries in the workplace and better health among employees. A significant relationship between job satisfaction, age and perceived co-workers’ commitment to work safety was not found. 相似文献
44.
The management of small-scale freshwater fisheries in Amazon has been based usually on surveys of urban markets, while fisheries
of rural villages have gone unnoticed. We compared the fishing characteristics (catch, effort and selectivity) between an
urban market and five small villages in the Lower Tocantins River (Brazilian Amazon), downstream from a large reservoir. We
recorded 86 and 601 fish landings in the urban market and villages, respectively, using the same methodology. The urban fishers
showed higher catch per unit of effort, higher amount of ice (related to a higher fishing effort, as ice is used to store
fish catches) and larger crew size per fishing trip, but village fishers had a higher estimated annual fish production. Conversely,
urban and village fishers used similar fishing gear (gillnets) and the main fish species caught were the same. However, village
fishers showed more diverse strategies regarding gear, habitats and fish caught. Therefore, although it underestimated the
total amount of fish caught in the Lower Tocantins River region, the data from the urban market could be a reliable indicator
of main fish species exploited and fishing gear used by village fishers. Monitoring and management should consider the differences
and similarities between urban and rural fisheries, in Amazon and in other tropical regions. 相似文献
45.
Maintaining the Conservation Value of Shifting Cultivation Landscapes Requires Spatially Explicit Interventions 总被引:1,自引:0,他引:1
Fallow vegetation within landscapes dominated by shifting cultivation represents a woody species pool of critical importance
with considerable potential for biodiversity conservation. Here, through the analysis of factors that influence the early
stages of fallow vegetation regrowth in two contrasting forest margin landscapes in Southern Cameroon, we assessed the impact
of current trends of land use intensification and expansion of the cultivated areas, upon the conservation potential of shifting
cultivation landscapes. We combined the analysis of plot and landscape scale factors and identified a complex set of variables
that influence fallow regrowth processes in particular the characteristics of the agricultural matrix and the distance from
forest. Overall we observed a decline in the fallow species pool, with composition becoming increasingly dominated by species
adapted to recurrent disturbance. It is clear that without intervention and if present intensification trends continue, the
potential of fallow vegetation to contribute to biodiversity conservation declines because of a reduced capacity, (1) to recover
forest vegetation with anything like its original species composition, (2) to connect less disturbed forest patches for forest
dependent organisms. Strategies to combat biodiversity loss, including promotion of agroforestry practices and the increase
of old secondary forest cover, will need not only to operate at a landscape scale but also to be spatially explicit, reflecting
the spatial pattern of species reservoirs and dispersal strategies and human usage across landscapes. 相似文献
46.
Silva LI Justino CI Lopes I Pereira R Freitas AC Calado R Rocha-Santos TA Panteleitchouk TS Pereira ME Duarte AC 《Journal of environmental monitoring : JEM》2011,13(6):1811-1815
A new methodology for the assessment of thiocyanate (SCN(-)) is proposed based on optical fiber (OF) detection coupled to a liquid chromatography system (LC). The developed methodology showed an adequate performance for the analysis of SCN(-) comparable to a high performance liquid chromatography with UV detector (HPLC-UV) methodology: a detection limit of 3 μg L(-1), a linear range from 4 to 400 μg L(-1), and an analytical time of less than 6 min. The OF based methodology was of compact design and easy operation. This simple system has the potential to be used as a sensing approach for SCN(-) in seawater. 相似文献
47.
Lyubomirova V Djingova R van Elteren JT 《Journal of environmental monitoring : JEM》2011,13(6):1823-1830
The introduction of catalytic converters has led to a new environmental problem since catalysts emit platinum group elements (PGEs) which are among the least distributed elements in nature. Along with PGEs the vehicle exhaust catalysts contain also a number of stabilizers, commonly oxides of rare earth elements and alkaline earth elements such as Ce, La and Zr. Since vehicular emission of these elements has received little attention so far this work attempts to offer insight into their distribution and fate in the environment by measuring their speciation in road dust samples collected along several highways in Germany and a city centre (Saarbrücken). Speciation of the elements (fractionation into associated mineralogical phases) was carried out via a conventional sequential extraction protocol and the complexing abilities of humic substances in the organic matter were investigated by selective extraction methods in combination with size segregation. For evaluation purposes soil samples spiked with catalytic converter material were analyzed, showing a much lower fraction of Ce, La and Zr mobilized in comparison to the road dust samples. It was found that the elements were effectively bound to humic substances in road dust with a preference for complexation with low molecular weight compounds (<1600 Da). 相似文献
48.
Roviello Valentina Gilhen-Baker Melinda Roviello Giovanni N. Lichtfouse Eric 《Environmental Chemistry Letters》2022,20(5):2729-2734
Environmental Chemistry Letters - 相似文献
49.
Volova Tatiana G. Kurachenko Natalya L. Bopp Valentina L. Thomas Sabu Demidenko Aleksey V. Kiselev Evgeniy G. Baranovsky Sergey V. Sukovatyi Aleksey G. Zhila Natalia O. Shishatskaya Ekaterina I. 《Environmental science and pollution research international》2022,29(14):20249-20264
Environmental Science and Pollution Research - The efficacy of slow-release formulations of tribenuron-methyl (TBM) embedded in the matrix of degradable poly(3-hydroxybutyrate) blended with birch... 相似文献
50.
Sergio Castellano Valentina Marconi Valeria Zanollo Giulia Berto 《Behavioral ecology and sociobiology》2009,63(8):1109-1118
As in many lekking anurans, Italian treefrog males use two mating tactics: they can attract females by calling vigorously
or be satellites, that is, they can remain silent in proximity of a calling male and try to intercept females attracted by
their neighbour. We investigated the factors that affected the expression of this mating tactic. Consistent with the conditional
mating tactic hypothesis, satellites were smaller than average and smaller than their parasitised calling males. They spent
a larger-than-average number of nights at the breeding site, where most of them were also observed calling. Moreover, satellites
showed lower call rates and lower mating success than those of males they parasitise but not lower than those of males they
did not parasitise. Overall, these results, together with those derived from the analyses of the seasonal and spatial distribution
of males, provide evidence for a non-random association between satellites and calling males and are consistent with the hypothesis
that satellites have spectral and temporal acoustic preferences that parallel those of females. By adopting the less-successful
satellite mating tactic, competitively inferior males can nevertheless maximise their potential reproductive fitness by sexually
parasitising the most attractive chorusing males. 相似文献