全文获取类型
收费全文 | 89篇 |
免费 | 2篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 5篇 |
环保管理 | 10篇 |
综合类 | 8篇 |
基础理论 | 16篇 |
污染及防治 | 33篇 |
评价与监测 | 14篇 |
社会与环境 | 4篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 6篇 |
2017年 | 1篇 |
2016年 | 8篇 |
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 9篇 |
2012年 | 8篇 |
2011年 | 4篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 10篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2001年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 2篇 |
排序方式: 共有94条查询结果,搜索用时 31 毫秒
71.
Lara Rubén Szlafsztein Claudio Cohen Marcelo Berger Uta Glaser Marion 《Journal of Coastal Conservation》2002,8(1):97-102
This work analyses effects of recent variations in the tidal inundation frequency in a mangrove ecosystem in the Bragança peninsula, North Brazil, and its implications for land occupation and use. Field data, time series of remote sensing images and local legislation were analysed focusing on the potential socio-economic impact of a changing environmental setting due to a rise in relative sea level. In the investigated period (1972–1997), vegetation changes along the coastline indicate net losses of mangrove coverage. In the central part of the peninsula, a topographically higher herbaceous plain constituting part of a farm presents an active progression of mangrove forest into an area previously dominated by grasses and herbs. This area measured 8.8 km2 in 1972 but was gradually reduced to 5.6 km2 in 1997, while progressively replaced by a monospecific stand of the black mangrove,Avicennia germinans. A linear extrapolation indicates that the elevated plain may be completely covered by mangrove by 2035. Current Brazilian legislation prohibits the extraction of mangrove trees without an officially approved management plan. Thus, the usable area of the farm has suffered a reduction by ca. 36% over 25 yr and we predict that is could be entirely replaced by mangroves in the next 35 yr. In this case study, legislation and ecosystem characteristics are analysed and a management plan discussed which could represent income alternatives for affected resource users at the local and regional level. 相似文献
72.
Acid rain and nitrogen deposition in a sub-tropical watershed (Piracicaba): ecosystem consequences 总被引:7,自引:0,他引:7
Krusche AV de Camargo PB Cerri CE Ballester MV Lara LB Victoria RL Martinelli LA 《Environmental pollution (Barking, Essex : 1987)》2003,121(3):389-399
High levels of wet N and acidic deposition were measured in southeast Brazil. In this study we addressed the sensitivity of water bodies and soils to acidification and N deposition in the Piracicaba River basin (12,400 km2). Average acid neutralization capacity (ANC) at 23 river sampling sites varied from 350 to 1800 microeq l(-1). Therefore, rivers and streams in the Piracicaba basin are well buffered, if the lower limit of 200 microeq l(-1) is assumed as an indication of poorly buffered waters. ANC is increased by untreated wastewaters discarded into rivers and streams of the region. Average NO3 concentrations varied from 20 to 70 microeq l(-1). At the most polluted river sites, NO3 concentration is not highest, however, probably due to NO3 reduction and denitrification. Most of the nitrogen in streams is also provided by wastewaters and not by wet deposition. The majority of the soils in the basin, however, are acidic with a low base cation content and high aluminum concentration. Therefore, soils in this basin are poorly buffered and, in areas of forest over sandy soils, acidification may be a problem. 相似文献
73.
74.
Microbial Removal of Arsenic 总被引:1,自引:0,他引:1
Kauser Jahan Patricia Mosto Crystal Mattson Erin Frey Lara Derchak 《Water, Air, & Soil Pollution: Focus》2006,6(1-2):71-82
Bangladesh is currently the subject of the world's largest mass arsenic poisoning in history. Groundwater throughout Bangladesh
and West Bengal is contaminated with naturally occurring arsenic from the alluvial and deltaic sediments that form the region's
aquifers. It has been estimated that 75 million people are at risk of developing health effects associated with the ingestion
of arsenic. This project focuses on the use of microorganisms such as bacteria and algae to remove arsenic from water. Arsenic
in the arsenite form was used in the studies. Experiments were conducted with a common alga and wastewater bacteria. A common
green algae Scenedesmus abundans was used for determining arsenic uptake in batch experiments. Results of the experiments indicated that the algae biosorption
could be modeled by the conventional Langmuir isotherm model. Algae morphology studies indicated that the algae cells were
impacted due to the presence of arsenic as evidenced by clumping or loss of cell clusters. The wastewater bacteria also were
capable of high percent of arsenic removal. Results indicate that microbial uptake of arsenic may be a viable method of pretreatment
of arsenic contaminated water. However algae and sludge disposal would pose a problem and will have to be dealt with accordingly. 相似文献
75.
Monica R. Lara 《Marine Biology》2008,154(1):51-64
Larval fishes likely use a variety of settlement cues to locate and navigate toward the habitats they will inhabit as juveniles.
Information about the morphology and state of development of the sensory organs of larval stages of fishes provides insight
into their capabilities at the time of settlement. The peripheral olfactory organ of wild-caught late-stage larvae and early
juveniles and some adults of 14 species of the Caribbean reef fishes wrasses (Labridae), parrot fishes (Scaridae) and damselfish
(Pomacentridae) were examined using scanning electron microscopy and compared in terms of settlement specificity. Ages in
days after hatching and days post-settlement were determined from the otoliths. Morphology of the nares and the olfactory
epithelium are described for these species by stage. The separation of the anterior and posterior nares occurred before settlement
in the labrids but in some specimens of scarids this separation was not complete by the time of settlement. Densities of ciliated
and microvillous receptor cells and non-sensory ciliated epithelial cells were calculated. Densities of ciliated receptor
cells ranged from 0.389 μm−2 in a specimen of Thallasoma bifasciatum to 0.0057 μm−2 in Bodianus rufus and of microvillous receptor cells from 0.038 μm−2 in a Clepticus parrae juvenile to 0.266 μm−2 in a juvenile Doratonotus megalepis. Densities of non-sensory cilia, also associated with high olfactory ability, were also high. The olfactory organ in wrasses
is well developed prior to settlement and is comparable to that of adult fishes. The possible role of olfaction in larval
schooling, reef cue detection and orientation toward habitat at settlement is discussed.
相似文献
Monica R. LaraEmail: |
76.
Uta Berger Marion Glaser Boris Koch Gesche Krause Rubén Lara Ulrich Saint-Paul Dirk Schories Matthias Wolff 《Journal of Coastal Conservation》1999,5(2):125-134
The main objective of the MADAM project (Mangrove Dynamics and Management) is to generate the scientific basis enabling the
sustainable stewardship of the resources of the Caeté mangrove estuary in Northeast Brazil in the sense of integrated coastal
(zone) management. To achieve this, it is necessary to acquire in-depth knowledge of natural processes as well as of the relevant
institutional, cultural, economic, social and political dynamics. Causal linkages within the ecosystem, as well as between
ecosystem, economy and society, are analysed and explained via dynamic and trophic modelling. Scenario construction is intended
to forecast the effects of acute or chronic interference on utilized resources, and to answer wider, management-related questions
(e.g. restoration of destroyed areas, utilization potential for aquaculture). This paper describes the project strategy as
developed and modified in the context of research results from the initial 2-yr project phase. It is argued that a continuous
discussion process is essential to assess the validity of the strategies formulated at the beginning of a medium-time project,
particularly if the project is of interdisciplinary nature. 相似文献
77.
Louise Mair Eduardo Amorim Monira Bicalho Thomas M. Brooks Vincente Calfo Renata de T. Capellão Colin Clubbe Marianne Evju Eduardo P. Fernandez Gláucia C. Ferreira Frank Hawkins Randall R. Jiménez Lucas S. B. Jordão Magni Olsen Kyrkjeeide Nicholas B. W. Macfarlane Bianca C. Mattos Pablo H. A. de Melo Lara M. Monteiro Eimear Nic Lughadha Nina Pougy Domitilla C. Raimondo Trine Hay Setsaas Xiaoli Shen Marinez Ferreira de Siqueira Bernardo B. N. Strassburg Philip J. K. McGowan 《Conservation biology》2023,37(1):e14046
The successful implementation of the Convention on Biological Diversity's post-2020 Global Biodiversity Framework will rely on effective translation of targets from global to national level and increased engagement across diverse sectors of society. Species conservation targets require policy support measures that can be applied to a diversity of taxonomic groups, that link action targets to outcome goals, and that can be applied to both global and national data sets to account for national context, which the species threat abatement and restoration (STAR) metric does. To test the flexibility of STAR, we applied the metric to vascular plants listed on national red lists of Brazil, Norway, and South Africa. The STAR metric uses data on species’ extinction risk, distributions, and threats, which we obtained from national red lists to quantify the contribution that threat abatement and habitat restoration activities could make to reducing species’ extinction risk. Across all 3 countries, the greatest opportunity for reducing plant species’ extinction risk was from abating threats from agricultural activities, which could reduce species’ extinction risk by 54% in Norway, 36% in South Africa, and 29% in Brazil. Species extinction risk could be reduced by a further 21% in South Africa by abating threats from invasive species and by 21% in Brazil by abating threats from urban expansion. Even with different approaches to red-listing among countries, the STAR metric yielded informative results that identified where the greatest conservation gains could be made for species through threat-abatement and restoration activities. Quantifiably linking local taxonomic coverage and data collection to global processes with STAR would allow national target setting to align with global targets and enable state and nonstate actors to measure and report on their potential contributions to species conservation. 相似文献
78.
Reasonable Use?: The Challenges of Transboundary Groundwater Regulation in the Eastern United States
Robert T. Caccese Lara B. Fowler 《Journal of the American Water Resources Association》2020,56(3):379-386
Regulating groundwater in the Eastern United States (U.S.), particularly transboundary aquifers between states, is a challenge given the patchwork quilt of common law, statutory frameworks, and agency rules. Such regulation is made more challenging by the need for better quantification of pumping and use. These dynamics are exemplified through several case studies, including the first ever U.S. Supreme Court case related to groundwater withdrawals (set in the Eastern U.S.). As dynamics such as expanded irrigation, population increases, and ecological considerations influence groundwater use across the Eastern U.S., water use will continue to be an important driver for economic activity and interaction within and between states. To effectively regulate transboundary aquifers, governance solutions must incorporate current science into decision making and be implemented at local, state, regional, and federal scales. 相似文献
79.
Jesús Rojo Ana Rapp Beatriz Lara Silvia Sabariego Federico Fernández-González Rosa Pérez-Badia 《Environmental monitoring and assessment》2016,188(3):130
Aerobiological research into airborne pollen diversity and seasonal variations in pollen counts has become increasingly important over recent decades due to the growing incidence of asthma, rhinitis and other pollen-related allergic conditions. Airborne pollen in Guadalajara (Castilla-La Mancha, Spain) was studied over a 6-year period (2008–2013) using a Hirst-type volumetric spore trap. The highest pollen concentrations were recorded from February to June, coinciding with the pollen season of the pollen types that most contribute to the local airborne pollen spectrum: Cupressaceae (32.2 %), Quercus (15.1 %), Platanus (13.2 %), Olea (8.3 %), Populus (7.8 %) and Poaceae (7.2 %). These are therefore critical months for allergy sufferers. The pollen calendar was typically Mediterranean and comprised 25 pollen types. Between January and March, Cupressaceae pollen concentrations exceeded allergy risk thresholds on 38 days. Other woody species such as Olea and Platanus have a shorter pollen season, and airborne concentrations exceeded allergy risk thresholds on around 13 days in each case. Poaceae pollen concentrations attained allergy risk levels on 26 days between May and July. Other highly allergenic pollen types included Urticaceae and Chenopodiaceae-Amaranthaceae, though these are less abundant than other pollen types in Guadalajara and did not exceed risk thresholds on more than 3 and 5 days, respectively. 相似文献
80.