全文获取类型
收费全文 | 228篇 |
免费 | 4篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 13篇 |
环保管理 | 18篇 |
综合类 | 48篇 |
基础理论 | 47篇 |
污染及防治 | 57篇 |
评价与监测 | 27篇 |
社会与环境 | 12篇 |
灾害及防治 | 3篇 |
出版年
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 6篇 |
2017年 | 7篇 |
2016年 | 13篇 |
2015年 | 9篇 |
2014年 | 10篇 |
2013年 | 19篇 |
2012年 | 14篇 |
2011年 | 21篇 |
2010年 | 12篇 |
2009年 | 10篇 |
2008年 | 15篇 |
2007年 | 4篇 |
2006年 | 15篇 |
2005年 | 3篇 |
2004年 | 17篇 |
2003年 | 13篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有234条查询结果,搜索用时 340 毫秒
101.
Yigang Yang Huihuang Chen Mamun Abdullah Al Jean Claude Ndayishimiye Jun R Yang Alain Isabwe Anqi Luo Jun Yang 《环境科学学报(英文版)》2022,34(2):140-151
Urbanization often exerts multiple effects on aquatic and terrestrial organisms, including changes in biodiversity, species composition and ecosystem functions. However, the impacts of urbanization on river phytoplankton in subtropical urbanizing watersheds remain largely unknown. Here, we explored the effects of urbanization on phytoplankton community structure(i.e., biomass, community composition and diversity) and function(i.e., resource use efficiency) in a subtropical river at watershed sca... 相似文献
102.
Célie Dupuy Claire Galland Alain Devaux Sylvie Bony Véronique Loizeau Morgane Danion Vianney Pichereau Michel Fournier Jean Laroche 《Environmental science and pollution research international》2014,21(24):13789-13803
A multibiomarker approach was developed to evaluate the juvenile European flounder responses to a complex mixture of 9 polycyclic aromatic hydrocarbons (PAHs) and 12 polychlorinated biphenyls (PCBs). Exposure was performed through contaminated food pellets displaying: (1) PAH and PCB levels similar to those detected in the heavily polluted Seine estuary, respectively in sediments and in flatfish and (2) ten times these concentrations. Several biomarkers of the immune system (e.g., lysozyme concentration and gene expression of complement component C3 and TNF-receptor), DNA damage (e.g., Comet assay), energetic metabolism (e.g.,?activity of cytochrome C oxidase), detoxification process (e.g., cytochrome P450 1A1 expression level: CYP1A1; betaine homocysteine methyl transferase expression level: BHMT) were investigated after 14 and 29 days of contamination, followed by a 14-days recovery period. After 29 days of contamination, the detoxification activity (CYP1A1 expression level) was positively correlated with DNA damages; the increase of the BHMT expression level could also be related to the detoxification process. Furthermore, after the recovery period, some biomarkers were still upregulated (i.e., CYP1A1 and BHMT expression levels). The immune system was significantly modulated by the chemical stress at the two concentration levels, and the lysozyme appeared to be the most sensitive marker of the mixture impact. 相似文献
103.
104.
Ana M. M. Viana Anne Frézard Christian Malosse Terezinha M. C. Della Lucia Christine Errard Alain Lenoir 《Chemoecology》2001,11(1):29-36
Summary. Leaf cutting ants live in symbiosis with a basidiomycete fungus that is exploited as a source of nutrients for the ant larvae.
Tests of fungus transport demonstrated that Acromyrmex subterraneus subterraneus workers discriminate concolonial fungus from alien fungus, and rejected the latter. Larvae and pupae of the ant were used
as controls. Chemical analysis of the fungus revealed a great similarity between its hydrocarbon profile and that found on
the ant brood. Experiments with lures showed that chemical extracts from the fungus are responsible for this discrimination
process. Moreover, the presence of brood inside the fungus seemed to be important for discrimination of the fungus by workers.
Resident workers accepted concolonial broodless fungus less than concolonial fungus inoculated with brood odor. Fungus seems
to acquire colonial odor passively, simply by contact with the brood. The impact of fungus volume present in the nest on closure
of the colony is discussed. We show here for the first time the importance of a symbiotic vegetal organism in colonial recognition
in social insects.
Received 14 April 2000; accepted 29 September 2000 相似文献
105.
The transformation of natural forest regeneration processes by human activities has created the need to develop and implement new models of forest management. Alternative silvicultural systems such as variable retention harvest, partial and patch cuts, and older forest management practices such as under-planting, are used in many forests around the world, particularly in North American oak stands, the boreal and coastal temperate rain forests of Canada and the United States, and in many degraded tropical regions of Asia and the Americas. Specific objectives are pursued in each of these biomes, but some are common to most regions, such as preservation of cover and structure and their associated benefits for natural or artificial regeneration due to moderation of the microclimate, development of optimal light and competition conditions, and reduced predation by herbivores. Shelterwoods are often presented as an alternative to clear-cutting to improve the survival of planted trees. A meta-analysis of published results with randomization tests was performed to test the relationship between overstory density and planted seedling growth and survival. Multiple comparisons were also used to reveal optimal levels of overstory density, if they exist. A majority of studies show that survival and growth improve as stand density decreases to an intermediate level, below which they either drop or stabilize. This level seems optimal in most conditions, as it is also more apt to fulfill other objectives imposed on today's forest activities, such as the conservation of forest processes and structures, and the reconstruction of degraded stands through the accelerated return of mid- to late-successional species. 相似文献
106.
Although associations between myrmecophytes and their plant ants are recognized as a particularly effective form of protective
mutualism, their functioning remains incompletely understood. This field study examined the ant-plant Hirtella physophora and its obligate ant associate Allomerus decemarticulatus. We formulated two hypotheses on the highly specific nature of this association: (1) Ant presence should be correlated with
a marked reduction in the amount of herbivory on the plant foliage; (2) ant activity should be consistent with the "optimal
defense" theory predicting that the most vulnerable and valuable parts of the plant are the best defended. We validated the
first hypothesis by demonstrating that for ant-excluded plants, expanding leaves, but also newly matured ones in the long
term, suffered significantly more herbivore damage than ant-inhabited plants. We showed that A. decemarticulatus workers represent both constitutive and inducible defenses for their host, by patrolling its foliage and rapidly recruiting
nestmates to foliar wounds. On examining how these activities change according to the leaves’ developmental stage, we found
that the number of patrolling ants dramatically decreased as the leaves matured, while leaf wounds induced ant recruitment
regardless of the leaf’s age. The resulting level of these indirect defenses was roughly proportional to leaf vulnerability
and value during its development, thus validating our second hypothesis predicting optimal protection. This led us to discuss
the factors influencing ant activity on the plant’s surface. Our study emphasizes the importance of studying both the constitutive
and inducible components of indirect defense when evaluating its efficacy and optimality. 相似文献
107.
Ait-Mouheb Nassim Bahri Akiça Thayer Bechir Ben Benyahia Boumediene Bourrié Guilhem Cherki Brahim Condom Nicolas Declercq Rémi Gunes Adem Héran Marc Kitir Nurgul Molle Bruno Patureau Dominique Pollice Alfieri Rapaport Alain Renault Pierre Riahi Khalifa Romagny Bruno Sari Tewfik Sinfort Carole Steyer Jean-Philippe Talozi Samer Topcuoglu Bulent Turan Metin Wéry Nathalie Yıldırım Ertan Harmand Jérôme 《Regional Environmental Change》2018,18(3):693-705
Regional Environmental Change - Climate change and a growing population around the Mediterranean Rim are increasing the need for water and, consequently, the pressure on resources in terms of both... 相似文献
108.
Benoît Jobin Claudie Latendresse Alain Baril Charles Maisonneuve Céline Boutin Dominique Côté 《Environmental monitoring and assessment》2014,186(4):2215-2229
We studied landscape dynamics for three time periods (<1950, 1965, and 1997) along a gradient of agricultural intensity from highly intensive agriculture to forested areas in southern Québec. Air photos were analyzed to obtain long-term information on land cover (crop and habitat types) and linear habitats (hedgerows and riparian habitats) and landscape metrics were calculated to quantify changes in habitat configuration. Anthropogenic areas increased in all types of landscapes but mostly occurred in the highly disturbed cash crop dominated landscape. Perennial crops (pasture and hayfields) were largely converted into annual crops (corn and soybean) between 1965 and 1997. The coalescence of annual crop fields resulted in a more homogeneous agricultural landscape. Old fields and forest cover was consistently low and forest fragmentation remained stable through time in the intensive agriculture landscapes. However, forest cover increased and forest fragmentation receded in the forest-dominated landscapes following farm abandonment and the transition of old fields into forests. Tree-dominated hedgerows and riparian habitats increased in areas with intensive agriculture. Observed changes in land cover classes are related to proximate factors, such as surficial deposits and topography. Agriculture intensification occurred in areas highly suitable for agriculture whereas farm abandonment was observed in poor-quality agriculture terrains. Large-scale conversion of perennial crops into annual crops along with continued urbanization exerts strong pressures on residual natural habitats and their inhabiting wildlife. The afforestation process occurring in the more forested landscapes along with the addition of tree-dominated hedgerows and riparian habitats in the agriculture-dominated landscapes should improve landscape ecological value. 相似文献
109.
François Zimmermann Marie-Thérèse Lecler Frédéric Clerc Alain Chollot Eric Silvente Jérome Grosjean 《Waste management (New York, N.Y.)》2014,34(7):1257-1263
The fluorescent lamp recycling sector is growing considerably in Europe due to increasingly strict regulations aimed at inciting the consumption of low energy light bulbs and their end-of-life management. Chemical risks were assessed in fluorescent lamp recycling facilities by field measurement surveys in France, highlighting that occupational exposure and pollutant levels in the working environment were correlated with the main recycling steps and processes.The mean levels of worker exposure are 4.4 mg/m3, 15.4 μg/m3, 14.0 μg/m3, 247.6 μg/m3, respectively, for total inhalable dust, mercury, lead and yttrium. The mean levels of airborne pollutants are 3.1 mg/m3, 9.0 μg/m3, 9.0 μg/m3, 219.2 μg/m3, respectively, for total inhalable dust, mercury, lead and yttrium. The ranges are very wide. Surface samples from employees’ skin and granulometric analysis were also carried out. The overview shows that all the stages and processes involved in lamp recycling are concerned by the risk of hazardous substances penetrating into the bodies of employees, although exposure of the latter varies depending on the processes and tasks they perform. The conclusion of this study strongly recommends the development of a new generation of processes in parallel with more information sharing and regulatory measures. 相似文献