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排序方式: 共有65条查询结果,搜索用时 15 毫秒
51.
52.
Gregor Kalinkat Juliano S. Cabral William Darwall G. Francesco Ficetola Judith L. Fisher Darren P. Giling Marie‐Pierre Gosselin Hans‐Peter Grossart Sonja C. Jähnig Jonathan M. Jeschke Klaus Knopf Stefano Larsen Gabriela Onandia Marlene Pätzig Wolf‐Christian Saul Gabriel Singer Erik Sperfeld Ivan Jarić 《Conservation biology》2017,31(2):481-485
53.
Darren McCauley 《Local Environment》2015,20(1):34-49
Activism research is over-reliant on social psychological frameworks emphasising framing or ideological-based explanations. The current underdevelopment of resource-based accounts requires urgent attention from social movement scholars. Stressing the rationality of social movement actors, resource mobilisation theory is used to assess and understand the empirical validity of resource-driven social mobilisation. Anti-genetically modified organism (GMO) activism in France is selected as a uniquely ripe context for exploring resource mobilisation. A resource-based examination reveals why, when and how key anti-GMO movement actors differentiated their strategies on the basis of protest, politics and produce. A new framework is proposed to encompass key variables around material, human and network-based resources. It is argued that resource mobilisation research designs need to move beyond financially driven causal arguments. 相似文献
54.
Rebecca J. Howard Christopher J. Wells Thomas C. Michot Darren J. Johnson 《Environmental management》2014,54(1):30-50
Anthropogenic disturbances in wetland ecosystems can alter the composition and structure of plant assemblages and affect system functions. Extensive oil and gas extraction has occurred in wetland habitats along the northern Gulf of Mexico coast since the early 1900s. Activities involved with three-dimensional (3D) seismic exploration for these resources cause various disturbances to vegetation and soils. We documented the impact of a 3D seismic survey in coastal marshes in Louisiana, USA, along transects established before exploration began. Two semi-impounded marshes dominated by Spartina patens were in the area surveyed. Vegetation, soil, and water physicochemical data were collected before the survey, about 6 weeks following its completion, and every 3 months thereafter for 2 years. Soil cores for seed bank emergence experiments were also collected. Maximum vegetation height at impact sites was reduced in both marshes 6 weeks following the survey. In one marsh, total vegetation cover was also reduced, and dead vegetation cover increased, at impact sites 6 weeks after the survey. These effects, however, did not persist 3 months later. No effects on soil or water properties were identified. The total number of seeds that germinated during greenhouse studies increased at impact sites 5 months following the survey in both marshes. Although some seed bank effects persisted 1 year, these effects were not reflected in standing vegetation. The marshes studied were therefore resilient to the impacts resulting from 3D seismic exploration because vegetation responses were short term in that they could not be identified a few months following survey completion. 相似文献
55.
Kristin M. Kleisner Catherine Longo Marta Coll Ben S. Halpern Darren Hardy Steven K. Katona Frédéric Le Manach Daniel Pauly Andrew A. Rosenberg Jameal F. Samhouri Courtney Scarborough U. Rashid Sumaila Reg Watson Dirk Zeller 《Ambio》2013,42(8):910-922
Sustainable provision of seafood from wild-capture fisheries and mariculture is a fundamental component of healthy marine ecosystems and a major component of the Ocean Health Index. Here we critically review the food provision model of the Ocean Health Index, and explore the implications of knowledge gaps, scale of analysis, choice of reference points, measures of sustainability, and quality of input data. Global patterns for fisheries are positively related to human development and latitude, whereas patterns for mariculture are most closely associated with economic importance of seafood. Sensitivity analyses show that scores are robust to several model assumptions, but highly sensitive to choice of reference points and, for fisheries, extent of time series available to estimate landings. We show how results for sustainable seafood may be interpreted and used, and we evaluate which modifications show the greatest potential for improvements. 相似文献
56.
There are varying views about the consistency of safety culture across a given organisation or industrial sector: some view it as homogeneous, whereas others have suggested the presence of sub-cultures that vary according to the work group or worksite. This paper reports on a study in which job characteristics and safety climate ratings from a sample of British community pharmacists (N = 860) were subjected to a cluster analysis, with the aim of identifying whether discrete groups can be identified on the basis of these ratings. A four-cluster solution was obtained from the analysis. Examination of quantitative and qualitative data from each cluster led to them being identified as: (i) the disenfranchising pharmacy; (ii) the perilous pharmacy; (iii) the safety-focused pharmacy; (iv) the challenging pharmacy. On the basis of the data obtained, safety culture appears to have both characteristics generic to all community pharmacies and characteristics specific to each cluster, with a number of social and organisational factors influencing the culture in any one setting. Implications for the modelling and assessment of safety culture are discussed. 相似文献
57.
Remote sensing technology offers an opportunity to significantly increase the amount of site-specific information about field characteristics such as pest populations. Coupled with variable rate application technologies, this added information has the potential to provide environmental benefits through reduced pesticide applications. However, producers face a complicated adoption decision because output prices and crop yields are uncertain. A model is developed to examine the potential value of remote sensing information to pesticide applications in an option-value framework under uncertainty. Simulations suggest that remote sensing information could decrease pesticide use, but uncertainty and irreversibility are likely to limit technological adoption by farmers. Potential cost-share subsidies are discussed. 相似文献
58.
The build up of reduced inorganic sulfur in the sediments of inland wetlands and creeks is an emerging risk for the management of inland waterways and is a direct result of secondary salinisation. Inappropriate management of these sediments can lead to a number of adverse environmental outcomes, the most dramatic of which is the extreme acidification of inland waterways, but can also include deoxygenation and the release of heavy metals. This paper explores possible management options for reducing the impact of sulfidic sediments on inland waterways based on previous research into ameliorating the impact of acid mine and acid rock drainage and coastal acid sulfate soils. The main strategies explored include minimising the formation of sulfidic sediments in the first instance, rehabilitation of impacted waterways, or isolation of the water body from the surrounding environment. 相似文献
59.
Economic effects of CO2 fertilization of crops: transforming changes in yield into changes in supply 总被引:1,自引:0,他引:1
Increasing concentrations of atmospheric carbon dioxide CO2 have a beneficial effect on crop production that would tend to offset some of the economic losses that might be generated in some areas by the climatic effects of atmospheric CO2 and other greenhouse gases. Previous estimates of the economic benefits of CO2 fertilization on world crop production, however, were based on the assumption that percent changes in supply are equal to percent changes in yield. This assumption is not valid, however, because it confounds changes in supply with changes in quantity supplied. This error leads to an overestimation of the real economic benefits of CO2 fertilization by 61–166%. The effects of CO2 fertilization on crop production, therefore, will reduce some of the potential damages caused by the climatic impacts of greenhouse gases, but by significantly less than that indicated in earlier research. 相似文献
60.
Potential banana skins in animal social network analysis 总被引:2,自引:2,他引:0
Social network analysis is an increasingly popular tool for the study of the fine-scale and global social structure of animals.
It has attracted particular attention by those attempting to unravel social structure in fission–fusion populations. It is
clear that the social network approach offers some exciting opportunities for gaining new insights into social systems. However,
some of the practices which are currently being used in the animal social networks literature are at worst questionable and
at best over-enthusiastic. We highlight some of the areas of method, analysis and interpretation in which greater care may
be needed in order to ensure that the biology we extract from our networks is robust. In particular, we suggest that more
attention should be given to whether relational data are representative, the potential effect of observational errors and
the choice and use of statistical tests. The importance of replication and manipulation must not be forgotten, and the interpretation
of results requires care.
This contribution is part of the special issue “Social Networks: new perspectives” (Guest Editors: J. Krause, D. Lusseau and
R. James). 相似文献