全文获取类型
收费全文 | 494篇 |
免费 | 6篇 |
国内免费 | 7篇 |
专业分类
安全科学 | 17篇 |
废物处理 | 35篇 |
环保管理 | 38篇 |
综合类 | 81篇 |
基础理论 | 91篇 |
污染及防治 | 164篇 |
评价与监测 | 53篇 |
社会与环境 | 26篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 10篇 |
2022年 | 10篇 |
2021年 | 10篇 |
2020年 | 11篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 8篇 |
2016年 | 26篇 |
2015年 | 14篇 |
2014年 | 24篇 |
2013年 | 41篇 |
2012年 | 21篇 |
2011年 | 46篇 |
2010年 | 30篇 |
2009年 | 31篇 |
2008年 | 36篇 |
2007年 | 24篇 |
2006年 | 20篇 |
2005年 | 18篇 |
2004年 | 21篇 |
2003年 | 21篇 |
2002年 | 11篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1970年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有507条查询结果,搜索用时 15 毫秒
501.
Fish as indicators of disturbance in streams used for snorkeling activities in a tourist region 总被引:1,自引:0,他引:1
A set of metrics that reflect various aspects of population and fish community structure in streams used for snorkeling was
evaluated in the tourist region of Bodoquena Plateau, Brazil, with the purpose of biomonitoring the impacts of such activities.
Observations were made while snorkeling in two sites (active = with tourism; inactive = without tourism) and along the gradient
of daily tourist activity (before, during and after the passage of tourists) in two streams. Five metrics discriminated active
from inactive sites: (i) the abundance of Crenicichla lepidota and (ii) the incidence of reproductive activity in Crenicichla lepidota which were greater in inactive sites, regardless the gradient of daily tourist activity; (iii) the feeding pattern of Prochilodus lineatus, which differed among sites and along the gradient of daily tourist activity; (iv) the abundance of Moenkhausia bonita, which was higher in the active sites and significantly increased along the gradient of daily tourist activity in one stream
but decrease along the gradient in other stream; (v) the abundance of Hyphessobrycon eques, which was greater in inactive sites, regardless the gradient of daily tourist activity. With the exception of metric “iv”,
the metrics were mediated by the reduction in habitat structural complexity due to snorkeling disturbance. The definition
of these metrics is relevant because the degradation of ecosystem structural elements is one of the main impacts of recreational
activities on aquatic environments. The easy recognition of target species and high water transparency throughout the year
ensures the feasibility of these metrics in monitoring programs and may be applied by technicians after quick guides and training. 相似文献
502.
Dilek National Park in Western Turkey is a protected habitat for several endangered and threatened species. In an attempt to protect the endangered species, the park was classified as a World Heritage Preserve. Even with this change, the animal and flora variety are still at risk from previous metal contamination. Water samples were collected 10 cm below the water surface and sediment from 0-30 and 30-60 cm depth. Inorganic elements were found in all sediment samples. Sodium had the highest aqueous concentration (10,312 mg/L), while Cu, Fe, Mn, and Zn were present at levels significantly lower than the chronic exposure criteria. Zn was the least prevalent (0.4 mg/kg) compound found in the sediment. The highest toxic contaminant concentration was Mg at an average of 1,100 mg/kg. The main contamination source of that seems to be Great Meandrous River. More studies are needed to develop a protection and remediation strategy for Dilek National Park. 相似文献
503.
Lori H. Schwacke Tiago A. Marques Len Thomas Cormac G. Booth Brian C. Balmer Ashley Barratclough Kathleen Colegrove Sylvain De Guise Lance P. Garrison Forrest M. Gomez Jeanine S. Morey Keith D. Mullin Brian M. Quigley Patricia E. Rosel Teresa K. Rowles Ryan Takeshita Forrest I. Townsend Todd R. Speakman Randall S. Wells Eric S. Zolman Cynthia R. Smith 《Conservation biology》2022,36(4):e13878
The 2010 Deepwater Horizon (DWH) oil spill exposed common bottlenose dolphins (Tursiops truncatus) in Barataria Bay, Louisiana to heavy oiling that caused increased mortality and chronic disease and impaired reproduction in surviving dolphins. We conducted photographic surveys and veterinary assessments in the decade following the spill. We assigned a prognostic score (good, fair, guarded, poor, or grave) for each dolphin to provide a single integrated indicator of overall health, and we examined temporal trends in prognostic scores. We used expert elicitation to quantify the implications of trends for the proportion of the dolphins that would recover within their lifetime. We integrated expert elicitation, along with other new information, in a population dynamics model to predict the effects of observed health trends on demography. We compared the resulting population trajectory with that predicted under baseline (no spill) conditions. Disease conditions persisted and have recently worsened in dolphins that were presumably exposed to DWH oil: 78% of those assessed in 2018 had a guarded, poor, or grave prognosis. Dolphins born after the spill were in better health. We estimated that the population declined by 45% (95% CI 14–74) relative to baseline and will take 35 years (95% CI 18–67) to recover to 95% of baseline numbers. The sum of annual differences between baseline and injured population sizes (i.e., the lost cetacean years) was 30,993 (95% CI 6607–94,148). The population is currently at a minimum point in its recovery trajectory and is vulnerable to emerging threats, including planned ecosystem restoration efforts that are likely to be detrimental to the dolphins’ survival. Our modeling framework demonstrates an approach for integrating different sources and types of data, highlights the utility of expert elicitation for indeterminable input parameters, and emphasizes the importance of considering and monitoring long-term health of long-lived species subject to environmental disasters. Article impact statement: Oil spills can have long-term consequences for the health of long-lived species; thus, effective restoration and monitoring are needed. 相似文献
504.
505.
In situ stabilization of toxic elements in contaminated soils by the addition of amendments is being considered as an effective technique for remediation. In this paper, we performed both kinetics and equilibrium-based sorption experiments of three toxic elements (As, Cd and Tl) in soils amended with two by-products (phosphogypsum and sugar foam, rich in gypsum and calcium carbonate, respectively) to ascertain the feasibility of their application for improving the sorption capacity of As, Cd and Tl from the soil at 25, 35 and 50 °C. Kinetic studies indicated that the sorption follows a pseudo-second-order (PSO) kinetics and the sorption is a two-step diffusion process where both film and intraparticle diffusion played important roles in the sorption mechanisms of the elements. The Langmuir isotherms applied for sorption studies showed that the estimated maximum sorption capacity of the elements in control and amended soils decreased in the order of Cd > As > Tl. Using the thermodynamic equilibrium parameters obtained at different temperatures, the thermodynamic constants of sorption (ΔG, ΔH and ΔS) were also evaluated, indicating spontaneous and endothermic nature of the process, except Tl which was exothermic. An optimal scaling procedure was undertaken to determine the relationships between the kinetic and equilibrium sorption parameters. By means of statistical analysis it was seen that these inter-parametric relationships are dependent on the element nature. 相似文献
506.
Fachini A Vasconcelos MT 《Environmental science and pollution research international》2006,13(4):238-241
- Aims and Scope. The purpose of this study was to test whether two zeolites produced synthetically (products of zeolitic nature,
PZN) could influence either the yield of a diatom culture or the chemical changes in the cultures. For this purpose, Phaeodactylum
tricornutum was used as test organism in a culture medium of natural seawater enriched with N and P having negligible amounts
of ammonia.
Methods The PZN ZEBEN-06 and ZESTEC-56 were used in parallel experiments. The composition of trace metals and organic compounds with
chelate activity in the culture media, were determined by anodic or cathodic stripping voltammetry. The impact of leaching
silicon on the algal yield was evaluated by comparing the growth in the presence or absence of PZN, in seawater enriched or
not-enriched with silicon.
Results and Conclusions Both PZN significantly promoted the algal yield even in the absence of added silicon, a limiting nutrient for diatom growth.
The PZN acted as a silicon buffer while providing a source of silicon required for growth. In addition, PZN released into
the seawater small but significant amounts of the limiting micro-nutrient manganese (its concentration doubled during the
experiments), while simultaneously removing relatively high quantities of zinc from the seawater. The presence of PZN inhibited
the releasing of chelated compounds. These changes (sorption/desorption) caused by the PZN in the concentrations in the solutions
used as culture media of P. tricornutum were probably responsible for the differences in both the diatom and exudation observed
in the tested cultures. 相似文献
507.
Ojeda Juan Pablo Mercante Irma Teresa 《Journal of Material Cycles and Waste Management》2023,25(5):2753-2765
Journal of Material Cycles and Waste Management - Plastic waste management is of global concern while construction industry keeps searching for innovations to become more sustainable. In this... 相似文献