全文获取类型
收费全文 | 394篇 |
免费 | 5篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 19篇 |
环保管理 | 53篇 |
综合类 | 40篇 |
基础理论 | 89篇 |
环境理论 | 2篇 |
污染及防治 | 133篇 |
评价与监测 | 34篇 |
社会与环境 | 22篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 4篇 |
2022年 | 10篇 |
2021年 | 13篇 |
2020年 | 1篇 |
2019年 | 17篇 |
2018年 | 18篇 |
2017年 | 12篇 |
2016年 | 17篇 |
2015年 | 12篇 |
2014年 | 14篇 |
2013年 | 41篇 |
2012年 | 23篇 |
2011年 | 39篇 |
2010年 | 20篇 |
2009年 | 27篇 |
2008年 | 27篇 |
2007年 | 18篇 |
2006年 | 11篇 |
2005年 | 16篇 |
2004年 | 9篇 |
2003年 | 10篇 |
2002年 | 7篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1969年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有402条查询结果,搜索用时 234 毫秒
361.
Alipio Bermúdez-Couso Juan Carlos Nóvoa-Muñoz Manuel Arias-Estévez David Fernández-Calviño 《Chemosphere》2013,90(10):2526-2533
Metalaxyl and carbofuran dissipation was studied in response to different factors (soil bacterial communities, light irradiation, presence of an inorganic culture medium and presence of soil) and combinations of these factors in short-term experiments (48 h). The soil microbial communities have no effect on metalaxyl or carbofuran dissipation in the time scale employed. Light irradiation and soil promote metalaxyl and carbofuran dissipation by photodegradation and adsorption, respectively. However, photodegradation has a stronger effect on metalaxyl and carbofuran dissipation than the adsorption of the pesticides in the soil. The addition of the culture medium have no direct effect on pesticide dissipation, degradation by microbial communities or adsorption but its presence greatly increased photodegradation. 相似文献
362.
Manuel H. Barcelo-Quintal Maria C. Cebada-Ricalde Angel R. Trejo-Irigoyen Reyna B. Rendon-Osorio Jose A. Manzanilla-Cano 《Journal of environmental science and health. Part. B》2013,48(2):120-126
Kinetic studies of endosulfan photochemical degradation in controlled aqueous systems were carried out by ultraviolet light irradiation at λ = 254 nm. The photolysis of (α + β: 2 + 1) endosulfan, α-endosulfan and β-endosulfan were first-order kinetics. The observed rate constants obtained from linear least-squares analysis of the data were 1 × 10?4 s?1; 1 × 10?4 s?1; and 2 × 10?5 s?1, respectively, and the calculated quantum yields (φ) were 1, 1 and 1.6, respectively. Preliminary differential pulse polarographic (DPP) analysis allowed to observe the possible endosulfan photochemical degradation pathway. This degradation route involves the formation of the endosulfan diol, its transformation to endosulfan ether and finally the ether's complete degradation by observing the potential shifts. 相似文献
363.
José A. Manzanilla-Cano Manuel H. Barceló-Quintal Reyna B. Rendón-Osorio Julio Flores-RodrÍguez 《Journal of environmental science and health. Part. B》2013,48(5):515-522
A study was undertaken to determine the transformation kinetic of methylparathion (O, O, -dimethyl O-4 nitrophenylphosphorotioate) in the presence of Fe(III) between pH 2 and 7. The Fe(III) was not electroactive under the conditions used in this study, and polarographic signals were exhibited by methylparathion and main degradation product only. Data suggest that hydrolysis of methylparathion in an acid medium is catalyzed by Fe(III) and the pesticide did not degrade in this medium without this cation. Methylparathion degradation was observed at all the pHs studied and was independent of the predominant chemical form of Fe(III) in the aqueous medium. The reaction was first-order with pH-dependent rate constant (k) values ranging from 3.3 × 10? 3 h? 1 to 7.0 × 10? 3 h? 1. The k values increased as pH decreased, suggesting that Fe(III) acted as an electrophile in the reaction mechanism. 相似文献
364.
Strontium migration in a crystalline medium: effects of the presence of bentonite colloids 总被引:1,自引:0,他引:1
Albarran N Missana T García-Gutiérrez M Alonso U Mingarro M 《Journal of contaminant hydrology》2011,122(1-4):76-85
The effects of bentonite colloids on strontium migration in fractured crystalline medium were investigated. We analyzed first the transport behaviour of bentonite colloids alone at different flow rates; then we compared the transport behaviour of strontium as solute and of strontium previously adsorbed onto stable bentonite colloids at a water velocity of approximately 7.1·10(-6)m/s-224m/yr. Experiments with bentonite colloids alone showed that - at the lowest water flow rate used in our experiments (7.1·10(-6)m/s) - approximately 70% of the initially injected colloids were retained in the fracture. Nevertheless, the mobile colloidal fraction, moved through the fracture without retardation, at any flow rate. Bentonite colloids deposited over the fracture surface were identified during post-mortem analyses. The breakthrough curve of strontium as a solute, presented a retardation factor, R(f)~6, in agreement with its sorption onto the granite fracture surface. The breakthrough curve of strontium in the presence of bentonite colloids was much more complex, suggesting additional contributions of colloids to strontium transport. A very small fraction of strontium adsorbed on mobile colloids moved un-retarded (R(f)=1) and this fraction was much lower than the expected, considering the quantity of strontium initially adsorbed onto colloids (90%). This behaviour suggests the hypothesis of strontium sorption reversibility from colloids. On the other hand, bentonite colloids retained within the granite fracture played a major role, contributing to a slower strontium transport in comparison with strontium as a solute. This was shown by a clear peak in the breakthrough curve corresponding to a retardation factor of approximately 20. 相似文献
365.
M. Dolores Garza-Gil Julia Torralba-Cano Manuel M. Varela-Lafuente 《Regional Environmental Change》2011,11(1):87-95
This study evaluates the economic effects of climate change on one of the most relevant fisheries of the Iberian Peninsula,
the European sardine fishery; a fishing ground that is particularly sensitive to environmental impacts. For this, the sea
surface temperature is introduced into the problem as an additional variable. This variable allows for the gathering of climate
change evidence and its repercussions on the oceans and, consequently, on the marine life and ecosystems. Various plausible
scenarios are posed with respect to the trends involving the sea surface temperature. The results show that if the trend of
rising surface temperatures continues in the Iberian-Atlantic fishing grounds, both the sardine biomass and the expected profits
will noticeably decrease. The biomass and profits will further decrease with greater intensity if the immediate effects of
global warming on sea surface temperature become more significant. On the other hand, in a palliation of global warming scenario,
both variables decrease to a lesser degree. 相似文献
366.
López-López JA García-Vargas M Moreno C 《Environmental pollution (Barking, Essex : 1987)》2011,159(5):1136-1143
To establish the quality of waters it is necessary to identify both point and non-point pollution sources. In this work, we propose the combination of clean analytical methodologies and chemometric tools to study discrete and diffuse pollution caused in a river by tributaries and precipitations, respectively.During a two-year period, water samples were taken in the Guadalquivir river (selected as a case study) and its main tributaries before and after precipitations. Samples were characterized by analysing nutrients, pH, dissolved oxygen, total and volatile suspended solids, carbon species, and heavy metals. Results were used to estimate fluvial and atmospheric inputs and as tracers for anthropic activities.Multivariate analysis was used to estimate the background pollution, and to identify pollution inputs. Principal Component Analysis and Cluster Analysis were used as data exploratory tools, while box-whiskers plots and Linear Discriminant Analysis were used to analyse and distinguish the different types of water samples. 相似文献
367.
Guzmán Gloria I. González de Molina Manuel Soto Fernández David Infante-Amate Juan Aguilera Eduardo 《Regional Environmental Change》2018,18(4):995-1008
Regional Environmental Change - According to the agroecological approach, energy analyses applied to agriculture should provide information about the structure and functions of the agroecosystem;... 相似文献
368.
Tainã Gonçalves Loureiro Pedro Manuel Anastácio Sérgio Luiz de Siqueira Bueno Paula Beatriz Araujo 《Environmental monitoring and assessment》2018,190(9):559
Invasive species are one of the main threats to biodiversity. When an alien species is introduced into a new environment, fast identification and definition of management strategies may avoid or minimize impacts. When an invasive species is already established, the most adopted approaches are population control and monitoring. In order to perform such strategies, assessment of characteristics of the invasive population is imperative. This study tested a new method of population size estimation and monitoring in an invasive population of crayfish Procambarus clarkii in a conservation area in the Atlantic Rain Forest (Southeastern Brazil). The population dynamics was studied for 1 year to examine the efficacy of the selected method and to evaluate if the population is stable. Later, the effect of periodical removal of animals on the population size was tested. The method of population estimation used in this study proved to be very effective. We recommend using it to monitor invasive populations of P. clarkii. The population size varied discretely over the year with variable but low growth rate, indicating that the population is already established which introduce a notable threat to native species. The continuous removal of specimens proved to be inefficient since the growth rate was higher after the removal. One intensive removal event might be more effective than a continuous moderate removal as the one applied in this study. 相似文献
369.
Reactivity of the plant growth regulator paclobutrazol (cultar) with two tropical soils of the northeast semiarid region of Brazil 总被引:1,自引:0,他引:1
Milfont ML Martins JM Antonino AC Gouveia ER Netto AM Guiné V Mas H dos Santos Freire MB 《Journal of environmental quality》2008,37(1):90-97
The reactivity of paclobutrazol (PBZ, a plant growth retardant) with a Yellow Ultisol and a Vertisol from the semiarid northeast region of Brazil was evaluated through batch sorption experiments and modeling. Although not instantaneous, the sorption kinetic of PBZ (pure and formulated) was fast (a few hours) in both soils. The sorption kinetics were well described by a second-order (dS(t)/dt=k(2)(S(e2)-S(t))(2)) but not by a first-order model. The sorption isotherms were found to be linear and the calculated K(D) values were 8.8 +/- 0.11 and 7.4 +/- 0.2 L kg(-1) for pure PBZ in the Ultisol and the Vertisol, respectively. The corresponding K(OC) values were 1275 +/- 34 (logK(OC) = 3.11) and 1156 +/- 49 (logK(OC) = 3.06) L kg(-1), respectively. Considering the very different texture of the two soils and the similar K(OC) values determined, these results showed that in both soils, the sorption of PBZ is dominantly controlled by organic matter, although some interactions of PBZ with iron oxides (goethite) were observed in the Ultisol. Based on these sorption parameters a low leachability potential of PBZ in soils is anticipated, as they correspond to a groundwater ubiquity score (GUS) ranging from 2.0 to 2.7, i.e., moderately to not mobile, in contradiction with the actual groundwater situation in Brazil. This work stresses the need to evaluate and predict the risk associated with aquifer contamination by this widely used plant growth regulator. 相似文献
370.
Vermicomposting is the process whereby organic residues are broken down by earthworms and microorganisms. Addition of manure has been shown to be of critical importance and determines most of the changes that take place during vermicomposting. Here, we study how the rate of manure applied affects microbial biomass and activity and carbon losses. For this, we designed continuous feeding reactors in which new layers of manure were added sequentially to form an age gradient inside the reactors. We compared two application rates of pig slurry (1.5 and 3kg) and set up six reactors for each one; half of the 12 reactors initially contained a population of 500 earthworms (Eisenia fetida). We found that earthworms increased microbial biomass and were more active in reactors fed with 3kg of slurry. However, the differential rates of respiration were not reflected in C losses. The results thus showed that loss of C was not affected by the rate of pig slurry applied. We conclude that despite the strong effect that the rate of manure has on microbe-earthworm relationships, it did not affect carbon losses. We therefore recommend the use of low application rates of manure when the objective is the microbial stabilization of the residue. 相似文献