共查询到20条相似文献,搜索用时 15 毫秒
1.
Margaret Kalcic Linda Prokopy Jane Frankenberger Indrajeet Chaubey 《Environmental management》2014,54(4):795-813
Watershed managers have largely embraced targeting of agricultural conservation as a way to manage strategically non-point source pollution from agricultural lands. However, while targeting of particular watersheds is not uncommon, targeting farms and fields within a specific watershed has lagged. In this work, we employed a qualitative approach, using farmer interviews in west-central Indiana to better understand their views on targeting. Interviews focused on adoption of conservation practices on farmers’ lands and identified their views on targeting, disproportionality, and monetary incentives. Results show consistent support for the targeting approach, despite dramatic differences in farmers’ views of land stewardship, in their views about disproportionality of water quality impacts, and in their trust in conservation programming. While the theoretical concept of targeting was palatable to all participants, many raised concerns about its practical implementation, pointing to the need for flexibility when applying targeting solutions and revealing misgivings about the government agencies that perform targeting. 相似文献
2.
Carlos C Alexandrino F Stoppe NC Sato MI Ottoboni LM 《Journal of environmental management》2012,93(1):38-43
Repetitive element sequence-based polymerase chain reaction (rep-PCR) is one of the commonest methods used to identify sources of fecal contamination of water systems. In this work, BOX-A1R-based repetitive extragenic palindromic-PCR (BOX-PCR) was used to discriminate Escherichia coli strains originating from different animals and water sources, and the suitability of the technique for bacterial source tracking (BST) was evaluated. A total of 214 strains from humans, 150 strains from animals, 55 strains from sewage and 77 strains from water bodies were analyzed by the BOX-PCR technique. When maximum similarity between the fingerprints was used, a correct classification rate of 84% was achieved for strains from human and animal sources. Furthermore, 95% of the strains found in sewage were classified as being from human sources by at least one of the four classification tools used. Classification of the strains found in water bodies in the State of S?o Paulo was based on the fingerprints obtained for human and animal sources. Most of the sampling sites appeared to be affected by mixed sources of fecal contamination. The use of BOX-PCR for BST could be especially valuable in developing countries, where simplicity and cost are important considerations. 相似文献
3.
James F. Cruise Charles A. Laymon Osama Z. Al-Hamdan 《Journal of the American Water Resources Association》2010,46(6):1159-1170
Cruise, James F., Charles A. Laymon, and Osama Z. Al-Hamdan, 2010. Impact of 20 Years of Land-Cover Change on the Hydrology of Streams in the Southeastern United States. Journal of the American Water Resources Association (JAWRA) 46(6):1159–1170. DOI: 10.1111/j.1752-1688.2010.00483.x Abstract: Land-cover changes for portions of Alabama, Georgia, and Tennessee were estimated for the years 1980, 1990, and 2000 using classified Landsat images, and associated with hydrologic indices for 12 watersheds in the region. Rainfall-adjusted mean annual streamflow, an ET proxy (precipitation minus runoff), frequency of inundation above thresholds, and duration of inundation were used to characterize the hydrologic response of the test basins over the two-decade study period. Results indicate that several of the watersheds had undergone significant (>20%) reductions in agricultural land cover with a coincident increase in forested land. Attempts to correlate the hydrologic results with the land-cover changes were only partially successful. Watersheds with the largest land conversion from agriculture to forest (20% or more) did show significant trends in hydrologic indices indicating decreasing streamflow; however, other basins evidenced ambiguous results. The net conclusions of the study are that land-cover effects on hydrologic variables may be nuanced and can sometimes be only indirectly evident, and that a rigorous and detailed land-cover classification effort along with a battery of statistical tests with the same objective may be necessary to uncover these effects. 相似文献
4.
Typical sources of extremely low frequency magnetic fields include components of the power network and, as an extension, AC
railway powering. The majority of these sources have longitudinal shapes. There is sometimes the need to reduce these fields
in specific areas of interest. In this article, practical aspects are studied of shielding design when this type of source
is involved. The focus is on design features not often treated in the shielding literature. One aspect relates to the differences
between 2D and 3D simulations and experimental validation for a relatively long system of conductor and shield; as an example,
the screening of the magnetic field of a railway system is presented. Another aspect relates to issues that arise when edge
effects become relevant for actual systems. It is established that shielding factors are considerably improved when shielding
of the edges is properly taken into account. The presence of gaps or loose contacts that are often responsible for low shielding
efficiency is also studied. Experimental tests show that overlapping shields or the use of conductive patches significantly
improves shielding efficiency. A last aspect is related to cost-effectiveness of shielding designs; in this case, numerical
computations are used for benchmarking shielding properties for long busbars in secondary substations. 相似文献
5.
Determinants of Farmers’ Adoption of Improved Soil Conservation Technology in a Middle Mountain Watershed of Central Nepal 总被引:2,自引:0,他引:2
This study explores different socio-economic and institutional factors influencing the adoption of improved soil conservation technology (ISCT) on Bari land (Rainfed outward sloping terraces) in the Middle Mountain region of Central Nepal. Structured questionnaire survey and focus group discussion methods were applied to collect the necessary information from farm households. The logistic regression model predicted seven factors influencing the adoption of improved soil conservation technology in the study area including years of schooling of the household head, caste of the respondent, land holding size of the Bari land, cash crop vegetable farming, family member occupation in off farm sector, membership of the Conservation and Development Groups, and use of credit. The study showed that technology dissemination through multi-sectoral type community based local groups is a good option to enhance the adoption of improved soil conservation technology in the Middle Mountain farming systems in Nepal. Planners and policy makers should formulate appropriate policies and programs considering the farmers' interest, capacity, and limitation in promoting improved soil conservation technology for greater acceptance and adoption by the farmers. 相似文献
6.
The Ozegahara peatland, in the Nikko-Oze National Park in Japan, is ecologically significant because of its oligotrophic environment; it is one of the most strictly preserved areas in the country. The isotope ratio of nitrogen (15N/14N) and carbon (13C/12C) and C/N ratio of peat moss (Sphagnum spp.) and sundew (Drosera rotundifolia) in the peatland were analyzed. The correlation of the isotope ratio with some parameters (sundew population density, number of trapped insects, water level, bog myrtle coverage, and visitor density) was investigated. The nitrogen isotope ratio of sundew showed the most significant covariation with visitor density, where sundew from lunch areas or along busy walkways showed a higher nitrogen isotope ratio. The nitrogen isotope ratio of peat moss covaried, not only with route traffic frequency but also with water level, bog myrtle coverage, and number of trapped insects by sundew, indicating that factors other than the visitor level influence the local nitrogen cycle. This study suggests that the nitrogen imported into the peatland by visitors is a principal factor to be monitored for the maintenance of the natural environment. 相似文献
7.
Laura McCann Haluk Gedikoglu Bob Broz John Lory Ray Massey 《Journal of Environmental Planning and Management》2015,58(8):1346-1362
The ability of both regulators and farmers themselves to monitor the impact of environmental practices may be an issue with nonpoint source pollution. Effects that can be perceived via direct sensory evidence provide information at low cost. Results from a survey of livestock farmers suggest that a practice that has more obvious effects on water quality, manure application setbacks, is more likely to be adopted than a more complicated one with less visible effects, manure testing. Farmers’ perceptions of the profitability of the two practices were similar. The importance of observability and complexity has implications for educational programs. 相似文献
8.
Agunwamba JC 《Environmental management》2003,32(1):116-127
The state of solid waste recycling by scavengers in Onitsha, a heavily commercial city in Anambra State, and some other urban areas such as Nsukka, Enugu, and Port Harcourt was analyzed. Data were obtained through interviews of scavengers who deal with recyclables. Although the activities of scavengers are sub-optimal, they can have a great impact on Nigerian economy with respect to resource conservation, creation of job opportunities, and reduction of the magnitude of waste disposal problems. A cost analysis is presented to compare the different forms of recycling utilized by municipal solid waste management. It is shown that a well-planned recycling program with recycling and composting would result in 18.6% savings in waste management costs and 57.7% in landfill avoidance costs. However, if the compost materials are not recycled, the corresponding savings in cost become 8.6% and 28.6%, respectively. The option with the lowest cost involves encouraging individual households to separate at the source their recyclables, which are bought by scavengers. This results in 78.0% savings in waste management cost and 79.5% landfill avoidance cost. A low-cost approach aimed at the integration of scavenging activities into conventional solid waste management is presented. 相似文献
9.
Turo Hjerppe Elina Seppälä Sari Väisänen Mika Marttunen 《Journal of Environmental Planning and Management》2017,60(11):1944-1966
The European Union Water Framework Directive (WFD) has created a demand for comparing the benefits and costs of the remedial measures. A major part of the benefits from improved water quality relate to the increased recreational value. However, there is a lack of easily operative and widely applicable quantitative methods to assess the benefits of improved water quality for recreational use. We present a new model to link physical indicators of water quality, water feasibility indicators for different recreational uses, individuals’ perceptions concerning the current feasibility of water for recreational purposes and monetary measures of water-related recreation benefits. The model has been applied to nine lakes, three rivers and one large coastal area in Finland. In this paper, we present the principles of the method and the results from one case study. In Finland, the method has been applied for the economic analysis required in the WFD. 相似文献
10.
Advancement of modern agricultural biotechnology has brought various potential benefits to humankind, but at the same time ethical concerns regarding some applications such as genetically modified foods (GMF) have been raised among the public. Several questions are being posed; should they utilize such applications to improve quality of their life, or should they refrain in order to save themselves from any associated risk? What are the ethical principles that can be applied to assess these applications? By using GMF as a case study, this paper discusses possible answers to these questions from Islamic perspective. Such answers are based on the understanding of the Islamic concept of maslahah (benefit) and mafsadah (harm) as well as the Islamic principles of priority. There is no specific GMF that has been declared as unlawful by Muslim scholars thus far. Nevertheless, they generally state that any GMF that contains unlawful substance is prohibited in Islam. Such statement can be understood since Islam puts highest priority to preserve shari’ah (Islamic law) which prescribes the lawful and unlawful things in human life. Priorities have also been given to preserve human health and environment therefore any GMF that may inflict harm on both entities is also considered as unlawful. 相似文献
11.
Visitor demographics, perceptions and their relationships are investigated to determine the problems and issues for outdoor
recreation, which has been a neglected part of the Turkish national park system, using the case of Termessos National Park,
located in the south of Turkey. The park is attractive for both its historical and natural resources. Five demographic characteristics
(gender, age, nationality, education level and income level) were used to test perceptions of the park resources, preference
for number of groups and perception of crowding. The data was collected via a questionnaire survey administered on-site. Chi-square
tests demonstrated that perceptions are significantly influenced by the nationality of respondents. Archaeological ruins were
perceived as the most popular park resource, and were more appreciated by the older age groups, French visitors and those
with higher education. Although the park was not perceived to be crowded, at least 25% of all age groups and 30% of all nationalities
preferred not to encounter any other groups, whereas a significant majority of Turkish visitors (over 95%) did not mind having
one or two groups present during their visit. Visitors with higher education and income levels preferred to encounter fewer
groups. At least 60% of the visitors were comfortable with the actual condition of the park. The trails, signage and brochures
were considered major problems. As an integrated part of the ruins, redesign of trails was perceived as necessary. Signage
was perceived to be the second most important problem, which is also related to trails and orientation, whereas brochures
were suggested as supplementary materials. 相似文献
12.
Patrick Mcalpine 《Local Environment》2013,18(3):243-257
Abstract The popularity of sustainability indicators is almost inescapable. From the early pioneers such as the ‘Sustainable Seattle’ project (Atkisson, ‘Developing Indicators of a Sustainable Community: lessons from Sustainable Seattle’, in: D. Satterthwaite (Ed), The Earthscan Reader in Sustainable Cities, London, Earthscan, 1996) to the comprehensive European Union benchmarking launched in 2003 (European Commission, European Common Indicators: towards a local sustainability profile, Milan, Ambiente Italia, 2003), it seems that consensus has been reached about the positive impacts that establishing sustainability indicators can bring. This paper uses the case of developing sustainability indicators on the Island of Guernsey over the last three years to show that Agenda 21's call to activate grassroots action is being realised, but in ways that are neither top-down and modernist in approach nor bottom-up and postmodernist as Agenda 21 advocates. Although best practice literature often suggests that community involvement must be engaged prior to designing sustainability indicators, this paper explores the reasons why this is not always possible. Guernsey's case is used to show how it only became possible to generate interest in the indicator process once they were actually up and running. However, it also shows that once interest was secured by a few relevant stakeholders it became possible to further evolve the indicators in a process that has slowly been attracting more and more of the Island's community. 相似文献
13.
Based on the norm activation theory we developed assumptions about how parents may influence specific pro-environmental behaviours (i.e. re-use of paper and recycling) of their children (age 8–10). A sample of 206 parent-child-dyads were investigated using questionnaires recording norm activation model variables for children (i.e. awareness of need, awareness of consequences, personal norm, subjective norm, pro-environmental behaviour), as well as communication behaviour and actual behaviour of parents. For both behaviours (re-use and recycling) two separate structural equation models were tested (N = 206 and N = 194). Model fit statistics indicate a good fit of empirical data and model structure for both behaviours, supporting our assumption that the norm activation model can be applied to pro-environmental behaviour of young children. Communication behaviour of parents had a different influence on the two respective behaviours. While parents seemed to influence their children's recycling behaviour via sanctions and their own behaviour, re-use of paper was mainly influenced via communication of problem knowledge. 相似文献
14.
15.
Rosa Binimelis 《Journal of Agricultural and Environmental Ethics》2008,21(5):437-457
The introduction of genetically modified organisms (GMOs) in Europe has been characterized by controversy. In 2002, the European
Union introduced the concept of “coexistence” as a compromise solution that, through the establishment of science-based technical
measures, should allow the market to operate freely while reducing policy conflicts on GMOs. However, the concept remains
highly contested and the technical measures difficult to apply. This paper presents qualitative research on the conceptualization
and implementation of the coexistence framework in two regions of Spain (Catalonia and Aragon), where 42% and 55% of maize
was GM in 2006, respectively. In this context, the concept of coexistence and its proposed implementation both fail to resolve
previous conflicts and actually work to generate new ones through the individualization of choice and impacts. Considerations
of the social conditions in which the technology and the management measures are implemented were not taken into account.
This resulted in the promotion of biotechnological agriculture over other alternatives. 相似文献
16.
Kjell Overvåg Terje Skjeggedal Camilla Sandström 《Journal of Environmental Planning and Management》2016,59(7):1186-1204
We have investigated why conflicts linked to the distribution of power between governments and actors at the national and local levels concerning environmental management of mountain areas in Norway persist despite political intentions to strengthen local powers. We seek to explain this by analysing changes in policies, institutional frameworks, and regional contexts, and the local perceptions of these changes. Paradoxically, the national government's power has apparently been strengthened by new sectoral regulations and more stringent enforcement of the existing ones, increases in the number and extent of protected areas, and failures to act on intentions to devolve power. An additional factor spurring conflicts is the increased importance of tourism to mountain communities. To become more relevant to policies and development in mountain areas, future studies on multilevel governance must address multilevel politics, entire mountain areas, and the context of their development, rather than focusing on minor projects and protected areas. 相似文献
17.
Richard P. Haynes 《Journal of Agricultural and Environmental Ethics》2001,14(2):231-240
The quest for a ``theory of nonhuman minds' to assessclaims about the moral status of animals is misguided. Misframedquestions about animal minds facilitate the appropriation ofanimal welfare by the animal user industry. When misframed, thesequestions shift the burden of proof unreasonably to animalwelfare regulators. An illustrative instance of misframing can befound in the US National Research Council's 1998 publication thatreports professional efforts to define the psychologicalwell-being of nonhuman primates, a condition that the US 1985animal welfare act requires users of primates to promote. Thereport claims that ``psychological well-being' is a hypotheticalconstruct whose validity can only be determined by a theory thatdefines its properties and links it to observed data. Thisconception is used to contest common knowledge about animalwelfare by treating psychological well-being as a mentalcondition whose properties are difficult to discover. Thisframework limits regulatory efforts to treat animal subjects lessoppressively and serves the interests of the user industry.A more liberatory framework can be constructed by recognizing thecontested nature of welfare norms, where competing conceptions ofanimal welfare have implications about norm-setting authority, asit does in other regulatory contexts, e.g., food safety. Properlyconceptualized welfare should include both the avoidance ofdistressful circumstances and the relationship between ananimal's capacities to engage in enjoyable activities and itsopportunities to exercise these capacities. This conception ofanimal welfare avoids appropriation by scientific experts.The development of the psychological well-being regulation is agood illustration of how social norms are contested and thenappropriated, and a critique of this appropriation shows how itcan be challenged. 相似文献
18.
As the cost of car ownership has skyrocketed, urban biking has experienced the largest share increase of any transportation mode, rising by 40% between the years 2000 and 2014. Growing attention is being paid to the potential local economic development impacts of urban neighbourhoods becoming more bike-friendly. It is now a green economic development strategy in cities as diverse as Chicago, New York City, Portland, and San Francisco to increase bicycling as a transportation mode. This paper reports the results of a survey of 2032 responses from faculty, staff, and students of a car-dependent, downtown university. We use a mixed methods approach, including data from the American Community Survey, to support our arguments and to inform potential savings and economic benefit calculations that can be achieved from bicycle infrastructure investments and anticipated redistributed spending patterns. We argue that urban biking results in a green dividend that promotes local community development and more importantly results in zero carbon emissions. 相似文献
19.
Jesús Barreiro-Hurlé María Espinosa-Goded Pierre Dupraz 《Journal of Environmental Planning and Management》2010,53(7):891-905
Agri-environmental schemes (AES) are the main policy instrument currently available in the EU to promote environmentally-friendly farming practices. However, the rate of adoption of these measures is still relatively low in southern Europe, and understanding how these rates can be increased is still an open issue. The goal of this paper is to increase that understanding by testing whether the factors which determine AES sign-up decisions are influenced by the intensity of change in farming practices that are brought about by adopting the scheme. A micro-economic model reflecting farmer AES sign-up decisions is proposed and applied to two schemes in Spain respectively requiring major or minor intensity of change in practices by surveying farmers eligible for both schemes. The results show that farm structural factors play a role when major practice change is required by the scheme, yet when dealing with minor change, individual farmer characteristics play a more determining role. Social capital and farmer attitude are important factors in both the AES surveyed. Therefore, it may be concluded that improving agronomic design would be an important tool to improve farmer participation in AES where major change is involved, whereas improved targeting and extension would help uptake for AES involving a lesser degree of change. 相似文献
20.
Zoning and applying Limits of Acceptable Change (LAC) are two promising strategies for managing tourism in Marine Protected
Areas (MPAs). Typically, these management strategies require the collection and integration of ecological and socioeconomic
data. This problem is illustrated by a case study of Koh Chang National Marine Park, Thailand. Biophysical surveys assessed
coral communities in the MPA to derive indices of reef diversity and vulnerability. Social surveys assessed visitor perceptions
and satisfaction with conditions encountered on snorkelling tours. Notably, increased coral mortality caused a significant
decrease in visitor satisfaction. The two studies were integrated to prescribe zoning and “Limits of Acceptable Change” (LAC).
As a biophysical indicator, the data suggest a LAC value of 0.35 for the coral mortality index. As a social indicator, the
data suggest that a significant fraction of visitors would find a LAC value of under 30 snorkellers per site as acceptable.
The draft zoning plan prescribed four different types of zones: (I) a Conservation Zone with no access apart from monitoring
or research; (II) Tourism Zones with high tourism intensities at less vulnerable reefs; (III) Ecotourism zones with a social
LAC standard of <30 snorkellers per site, and (IV) General Use Zones to meet local artisanal fishery needs. This study illustrates
how ecological and socioeconomic field studies in MPAs can be integrated to craft zoning plans addressing multiple objectives. 相似文献