全文获取类型
收费全文 | 1015篇 |
免费 | 11篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 43篇 |
废物处理 | 38篇 |
环保管理 | 122篇 |
综合类 | 190篇 |
基础理论 | 170篇 |
环境理论 | 1篇 |
污染及防治 | 345篇 |
评价与监测 | 70篇 |
社会与环境 | 47篇 |
灾害及防治 | 15篇 |
出版年
2023年 | 17篇 |
2022年 | 22篇 |
2021年 | 34篇 |
2020年 | 27篇 |
2019年 | 23篇 |
2018年 | 48篇 |
2017年 | 48篇 |
2016年 | 57篇 |
2015年 | 37篇 |
2014年 | 60篇 |
2013年 | 72篇 |
2012年 | 61篇 |
2011年 | 81篇 |
2010年 | 52篇 |
2009年 | 42篇 |
2008年 | 63篇 |
2007年 | 58篇 |
2006年 | 63篇 |
2005年 | 44篇 |
2004年 | 34篇 |
2003年 | 18篇 |
2002年 | 18篇 |
2001年 | 9篇 |
2000年 | 8篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 7篇 |
1996年 | 2篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1966年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1954年 | 3篇 |
1951年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有1041条查询结果,搜索用时 46 毫秒
181.
F. Badalamenti C. J. Sweeting N. V. C. Polunin J. Pinnegar G. D’Anna C. Pipitone 《Marine Biology》2008,154(5):765-773
Trawling has a significant effect on the structure of marine communities, yet the ubiquity of trawling impacts makes testing
such effects difficult. This study examines trawling impacts on trophodynamics of three fishes among the Gulfs of Castellammare
and Termini Imerese (northern Sicily), the first of which has been subject to a trawling ban since 1990 that initially resulted
in an eightfold increase in total fish biomass. The Gulf of Termini Imerese remains heavily fished and was treated as a control
site. Nitrogen and carbon stable isotope data were used to assess fishing induced changes in trophic levels or source of production
supporting three demersal fish species; Mullus barbatus,
Merluccius merluccius and Lophius budegassa following a control-impact approach. The exclusion of trawling resulted in only small alteration of δ15N in two of the three-three species. There were no systematic changes in the δ13C of any species sampled. Thus, a large influence of trawling on the trophodynamics of the studied species at sampled size
was discounted. Although stable isotopes do not have spatial or temporal resolution to identify detailed shifts in diet composition,
their integrative nature highlights that the trophic role these species play is robust to fishing impacts at scales over which
the fishery operates. This is despite a significant increase in the abundance of these species and of total fish biomass within
the protected area.
相似文献
C. J. SweetingEmail: |
182.
Anna Gagliardo Maria Savini Angelo De Santis Giacomo Dell’Omo Paolo Ioalè 《Behavioral ecology and sociobiology》2009,64(2):289-296
Some authors have proposed that homing pigeons are able to correct the error in orientation following a phase-shift treatment
by using the magnetic compass reference. They reported that clock-shifted pigeons bearing magnets display a greater deflection
compared to magnetically unmanipulated clock-shifted birds. However, this hypothesis tested by recording pigeons’ vanishing
bearings has led to contradictory results. The present study reports pigeons’ tracks recorded with a GPS and shows that clock-shifted
pigeons bearing magnets displayed a greater deviation through the whole route compared to the magnetically unmanipulated shifted
pigeons. Moreover, the analysis of the tracks shows that the birds belonging to both experimental groups stop in coincidence
with their subjective night. When re-starting their journey, the birds corrected the clock-shift induced error in orientation,
but the magnetically manipulated pigeons were less efficient in doing so. Our results are consistent with the hypothesis that
homing pigeons released from unfamiliar location re-orient after clock shift by using the magnetic compass. 相似文献
183.
184.
Anna Peterson 《Journal of Agricultural and Environmental Ethics》2008,21(6):607-608
185.
Development of a black carbon-inclusive multi-media model: application for PAHs in Stockholm 总被引:1,自引:0,他引:1
A multi-media model was developed for predicting the fate of organic chemicals in the Greater Stockholm Area, Sweden, and applied to selected polycyclic aromatic hydrocarbons (PAHs). Although urban models have been previously developed, this model is novel in that it includes sorption to pyrogenically-derived particles, commonly termed "black carbon" (BC), within the model structure. To examine the influence of BC sorption on environmental fate of PAHs, two versions of the model were generated and run: one in which sorption to BC was included and one in which BC sorption was excluded. The inclusion of BC sorption did not cause any significant variations to air levels, but it did cause an average 20-30% increase in sediment concentrations related to increased sediment solids partitioning. The model also predicted reduced advective losses out of the model domain, as well as chemical potential to diffuse from sediments, whilst total chemical inventory increased. In all cases, the lighter PAHs were more affected by BC inclusion than their heavier counterparts. We advocate the addition of sorption to BC in future multi-media fate and exposure models, which as well as influencing fate will also alter (lower) chemical availability and, thus, wildlife exposure to hydrophobic chemicals. A quantification of the latter was derived with the help of the soot-inclusive model version, which estimated a lowering of dissolved water concentrations between five and >200 times for the different PAHs of this study. 相似文献
186.
Assessment of the effects of soil PAH accumulation by a battery of ecotoxicological tests 总被引:2,自引:0,他引:2
Surface soils were collected at remote, urban and industrial sites in the Southern of Italy in order to evaluate PAH concentrations and assess the toxic effects by a battery of ecotoxicological tests. The tests were performed on whole soils and on both organic and aqueous extracts. Further goal of this study was to integrate the results coming from each test and matrix in a synthetic toxicity index. The highest summation sigmaPAH concentrations were measured at the industrial soil, although this one did not show an high ecotoxicological risk. Among the performed tests, the phytotoxicity tests showed the highest sensitivity. For whole soil, the worst case always has been represented by test through bacteria. Our results could represent the first step toward the selection of a proper battery to characterize the soil ecotoxicological risk. 相似文献
187.
Anna Bratt 《Local Environment》2004,9(1):65-79
The article analyses the perceptions at municipal level of potentials and problems in implementing integrated catchment management of water resources as proposed in the EU Water Framework Directive, expressed in views on how to reduce nutrient leakage from agricultural production. Heads of environmental authorities, spatial planners and environmental officers are among the professionals that will be key actors when implementing the WFD at the local level. Using a process of active focus group interviews, officials from municipal environmental offices studied, reflected upon and discussed the suggested plan concerning their part of implementing WFD. The municipal officers stressed certain conditions that have to be met to implement WFD in a sustainable manner. The most important conditions are clear environmental goals and management plans with support in legislation, which would put the necessary pressure upon local politicians to prioritize the WFD and take action. The respondents perceived the WFD would offer a changed approach in work routines with farmers towards partnerships for sustainable water resource management. 相似文献
188.
Debera A. Backhus Flynn W. Picardal Scott Johnson Tracy Knowles Richard Collins Anna Radue Sanggoo Kim 《Journal of contaminant hydrology》1997,28(4):337-361
Sorption of organic contaminants to soils has been shown to limit bioavailability and biodegradation in some systems. Use of surfactants has been proposed to reverse this effect. In this study, the effects of a high organic carbon content soil and a nonionic surfactant (Triton X-100) on the reductive dechlorination of carbon tetrachloride (CCl4) were examined in anaerobic systems containing Shewanella putrefaciens. Although more than 70% of the added CCl4 was sorbed to the soil phase in these systems, the reductive dechlorination of CCl4 was not diminished. Rather, rates of CCl4 dechlorination in systems containing soil were enhanced relative to systems containing non-sorptive sand slurries. This enhancement was also observed in sterile soil slurries to which a chemical reductant, dithiothreitol was added. It appears that the organic soil used in these experiments contains some catalytic factor capable of transforming CCl4 in the presence of an appropriate chemical or microbial reductant. The addition of Triton X-100 to sand and soil slurries containing S. putrefaciens resulted in increased CCl4 degradation in both systems. The effect of Triton could not be explained by: (i) surfactant induced changes in the distribution of CCl4, (i.e. decreased sorption) or the rate of CCl4 desorption; (ii) a direct reaction between Triton and CCl4; or (iii) increased cell numbers resulting from use of the surfactant as a substrate. Rather, it appears that Triton X-100 addition resulted in lysis of bacterial cells, a release of biochemical reductant, and enhanced reductive transformation of CCl4. These results provide insights to guide the development of more effective direct or indirect bioremediation strategies. 相似文献
189.
Maroušek Josef Maroušková Anna Zoubek Tomáš Bartoš Petr 《Environment, Development and Sustainability》2022,24(4):4835-4844
Environment, Development and Sustainability - The most common drinking water clarification technology worldwide is based on precipitation using the floccules of iron(III) oxide-hydroxide FeO(OH).... 相似文献
190.