全文获取类型
收费全文 | 436篇 |
免费 | 23篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 29篇 |
废物处理 | 15篇 |
环保管理 | 80篇 |
综合类 | 45篇 |
基础理论 | 131篇 |
环境理论 | 3篇 |
污染及防治 | 106篇 |
评价与监测 | 26篇 |
社会与环境 | 21篇 |
灾害及防治 | 7篇 |
出版年
2023年 | 9篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 9篇 |
2018年 | 16篇 |
2017年 | 22篇 |
2016年 | 19篇 |
2015年 | 16篇 |
2014年 | 11篇 |
2013年 | 45篇 |
2012年 | 24篇 |
2011年 | 29篇 |
2010年 | 17篇 |
2009年 | 23篇 |
2008年 | 28篇 |
2007年 | 24篇 |
2006年 | 20篇 |
2005年 | 20篇 |
2004年 | 10篇 |
2003年 | 12篇 |
2002年 | 10篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 7篇 |
1998年 | 8篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 8篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1982年 | 3篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有463条查询结果,搜索用时 31 毫秒
231.
The use of ozone in the remediation of polycyclic aromatic hydrocarbon contaminated soil 总被引:3,自引:0,他引:3
The potential of using ozone for the removal of phenanthrene from several different soils, both alone and in combination with biodegradation using a microbial inoculant (Pseudomonas alcaligenes PA-10), was examined. The greater the water content of the soil the less effective the ozone treatment, with air-dried soils showing the greatest removal of phenanthrene; while soils with higher levels of clay also reduced the effectiveness of the ozone treatments. However, at least a 50% reduction in phenanthrene levels was achieved in air-dried soil after an ozone treatment of 6 h at 20 ppm, with up to 85% removal of phenanthrene achieved in sandy soils. The biodegradation results indicate that P. alcaligenes PA-10 may be useful as an inoculant for the removal of PAHs from contaminated soils. Under the conditions used in our experiments, however, pre-ozonation did not enhance subsequent biodegradation of phenanthrene in the soils. Similar levels of phenanthrene removal occurred in both non-ozonated and ozonated Cruden Bay soil inoculated with P. alcaligenes PA-10. However, the biodegradation of phenanthrene in ozonated Boyndie soil was much slower. This may be due to the release of toxic products in this soil during ozonation. 相似文献
232.
Marrs RH Galtress K Tong C Cox ES Blackbird SJ Heyes TJ Pakeman RJ Le Duc MG 《Journal of environmental management》2007,85(4):1034-1047
Conservation management in Europe is often geared towards restoring semi-natural ecosystems, where the objective is to reverse succession and re-establish early-successional communities, to comply with national and international conservation targets. At the same time, it is increasingly recognised that ecosystems provide services that contribute to other, possibly conflicting policy requirements. Few attempts have been made to define these conflicts. Here, we assess some potential conflicts using a Calluna vulgaris-dominated moorland invaded by bracken (Pteridium aquilinum) as a model system, where the current policy is to reverse this process and restore moorland. We examined impacts of bracken control treatments on services (stocks and losses of C and mineral nutrients), litter turnover and biodiversity within a designed experiment over 7 years. Bracken litter was >2000 g m(-2) in untreated plots, and treatments reduced this quantity, and its element content, to varying degrees. Cutting twice per year was the most successful treatment in reducing bracken litter and its element content, increasing litter turnover, and increasing both mass and diversity of non-bracken vegetation. Diversity was greatest where bracken litter had been reduced, but species composition was also influenced by light sheep grazing. There was a significant loss of some chemical elements from bracken that could not be accounted for in other pools, and hence potentially lost from the system. In absolute terms large amounts of C and N were lost, but when expressed as a percentage of the total amount in the system, Mg was potentially more important with losses of almost a third of the Mg in the surface soil-vegetation system. There is, therefore, a potential dilemma between controlling a mid-successional invasive species for conservation policy objectives, especially when that species has evolved to sequester nutrients, and the negative effect of increasing environmental costs in terms of carbon accounting required, the potential input of nutrients to aquatic systems, and long-term nutrient loss. There is, therefore, a need to balance conservation goals against potential damage to biogeochemical structure and function. 相似文献
233.
The quantification of greenhouse gas (GHG) emissions can be a powerful sustainability measurement indicator for assessing environmental impacts of various operations, which can include remediation of chemically impacted media or construction projects. A carbon footprint calculator was developed and is presented in this article as one tool for applying sustainable practices to environmental remediation—specifically to assess the GHG footprint for remediation projects. The calculator is constructed from a compilation of published metrics and “standards.” © 2008 Wiley Periodicals, Inc. 相似文献
234.
The Biogeography of Faunal Place Names in the United States 总被引:1,自引:0,他引:1
235.
N. J. Brown R. Cox R. Pakeman A. G. Thomson R. A. Wadsworth M. Yates 《Journal of Coastal Conservation》2002,8(1):55-60
Very high resolution imagery from an airborne multi-spectrål scanner has been used to estimate the distribution of different salt-marsh communities along a 30-km stretch of the North Norfolk coast. Field observations have been used to develop a mathematical relationship between the vegetation, physical environment and sediment accumulation. This relationship has been used to produce provisional sediment accretion maps for the north Norfolk coast. 相似文献
236.
Human exposures to pesticides can occur in the workplace, in the household and through the ambient environment. While several articles have reviewed the impact of pesticide exposures on human respiratory health in occupational settings, to the best of our knowledge, this article is the first one to review published studies on the association between pesticide exposures and human respiratory health in the general populations. In this article, we critically reviewed evidences up to date studying the associations between non-occupational pesticide exposures and respiratory health in general populations. This article also highlighted questions arising from these studies, including our recent analyses using the data from the Canadian Health Measures Survey (CHMS), for future research. We found few studies have addressed the impact of environmental pesticide exposures on respiratory health, especially on lung function, in general populations. In the studies using the data from CHMS Cycle 1, exposures to OP insecticides, pyrethroid insecticides, and the organochlorine pesticide DDT were associated with impaired lung function in the Canadian general population, but no significant associations were observed for the herbicide 2,4-D. Future research should focus on the potential age-specific and pesticide-specific effect on respiratory health in the general population, and repeated longitudinal study design is critical for assessing the temporal variations in pesticide exposures. Research findings from current studies of non-occupational pesticide exposures and their health impact in general population will help to improve the role of regulatory policies in mitigating pesticide-related public health problems, and thereafter providing greater benefit to the general population. 相似文献
237.
Often ecologists and natural resource managers can easily access data on invasive species occurrence across a region. Yet,
collecting species abundance data over a large area is arguably more important for decision making, but inherently costly,
so methods which can provide robust information at low-cost are particularly valuable. Studies of species distribution often
use occurrence data to build models of the environmental niche. Environmental suitability derived from such models may be
used to predict the potential distributions of species. The ability of such models to predict spatial patterns in abundance
have recently been demonstrated. Here we tested the relationship of environmental suitability with local abundance of an aquatic
invasive species, olive hymenachne (Hymenachne amplexicaulis) in the Wet Tropics of Australia. Ordinary least squares and quantile regressions revealed a positive relationship between
environmental suitability and local abundance of olive hymenachne. We expand on this and use the relationship between environmental
suitability and local abundance to quantify the effectiveness of management (reduction in local abundance) under four different
management investments. We show that the upper limit of abundance can be used to evaluate management effectiveness based on
varying investments, and that ongoing management is the most effective at reducing local abundance. We discuss implications
of this in addressing important problems in invasive species management. 相似文献
238.
Altruism in the social Hymenoptera is generally considered to be a feature of females rather than males. A popular explanation
for this is that in the solitary ancestors of today's social species, males provided little brood care. Males might therefore
lack the preadaptations necessary to evolve altruism in social contexts. While anecdotal observations of male contributions
to colony life have been reported, there are few reports of male participation in nest defence. In apoid wasps, there have
been several reports of male nest-guarding behaviour in solitary species, potentially setting the evolutionary stage for similar
behaviours in social lineages. Here, we present evidence of active and effective nest defence in males of the social apoid
wasp Microstigmus nigrophthalmus. Males were observed chasing intruders away from the nest, and the presence of males had a significant effect on nest survival
when females were removed. Males potentially obtained direct benefits through defence, so that defence may not represent male
altruism. However, our results do show that males can perform acts that benefit their colony. 相似文献
239.
Teng Yu Cox Adam Chatziantoniou Ioannis 《Environmental science and pollution research international》2021,28(26):33781-33793
Environmental Science and Pollution Research - Tourism development is recognised as an essential tool in promoting economic growth; however, it may also contribute to environmental degradation.... 相似文献
240.
Abstract: Privately owned lands support a large portion of the biodiversity in some areas, but procedures for identifying those private lands critical to the maintenance of biodiversity vary tremendously. We used habitat-based distribution maps in combination with population conservation goals to help identify strategic habitats on private lands in Florida. We used a vegetation map, occurrence data, and published life-history information to create habitat-based distribution maps for 179 rare taxa. We estimated the security of 130 of the taxa by overlaying public land boundaries on habitat maps and then estimating whether conservation lands satisfied a population goal of supporting at least 10 populations of approximately 200 breeding adults. The remaining taxa were evaluated in terms of number of occurrence records on conservation lands. Of the 179 taxa evaluated, existing conservation lands did not adequately protect 56. We then identified habitats on private lands that could best satisfy the minimum conservation goal or else significantly enhance the survival potential of inadequately protected taxa. Strategic habitats included a mix of large and small sites, incorporated some corridor or stepping-stone connections among habitat patches, and protected multiple species. Additional strategic habitats were identified for shorebirds, four natural plant communities, and 105 globally rare plants. The strategic habitats identified in Florida cover 1.65 million ha (12% of the land area) and would cost $8.2 billion (about 15% of Florida's annual state budget) to purchase and $122 million per year to manage. Existing conservation lands account for 3.07 million ha (22% of the land area). 相似文献