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陆地石油污染生物降解技术的进展 总被引:1,自引:0,他引:1
生物治理石油环境污染具有处理费用低、效果好、无二次污染等优点,近年来得到广泛重视和发展应用,并已在治理土壤、岩石及地下水石油污染等方面取得了较好的效果。在此对就地或集中治理过程的近期发展进行了综述,讨论了强化治理过程的途径与展望以及在我国实验室和现场开发的前景。 相似文献
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人类尤其掌握了现代科学技术的利益集团的出现,加剧了自然生态系统退化已是不争的事实。正确的生物多样性保护应以就地保护为主,即保留野生生命的地盘远离人类干扰,任其自我维持,仅对哪些极度濒危的物种实施人工辅助或保护。尤其要警惕那些利用高科技技术消灭物种,牺牲当代人、子孙后代以及全球生态系统利益的做法。 相似文献
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River systems as providers of goods and services: a basis for comparing desired and undesired effects of large dam projects 总被引:3,自引:0,他引:3
Brismar A 《Environmental management》2002,29(5):598-609
In developing countries, large dam projects continue to be launched, primarily to secure a time-stable freshwater supply and
to generate hydropower. Meanwhile, calls for environmentally sustainable development put pressure on the dam-building industry
to integrate ecological concerns in project planning and decision-making. Such integration requires environmental impact statements
(EISs) that can communicate the societal implications of the ecological effects in terms that are understandable and useful
to planners and decision-makers.
The purpose of this study is to develop a basic framework for assessing the societal implications of the river ecological
effects expected of a proposed large dam project. The aim is to facilitate a comparison of desired and potential undesired
effects on-site and downstream. The study involves two main tasks: to identify key river goods and services that a river system
may provide, and to analyze how the implementation of a large dam project may alter the on-site capacity and downstream potentials
to derive river goods and services from the river system.
Three river goods and six river services are identified. River goods are defined as extractable partly man-made products and
river services as naturally sustained processes. By four main types of flow manipulations, a large dam project improves the
on-site capacity to derive desired river goods, but simultaneously threatens the provision of desirable river goods and services
downstream. However, by adjusting the site, design, and operational schedule of the proposed dam project, undesirable effects
on river goods and services can be minimized. 相似文献
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Fee-fishing involves paying a fee for the privilege of fishing a body of water where fish populations are enhanced by stocking
fish. Past literature on this activity has focused more on the operation of the enterprise and management of the fish than
the people and site characteristics. The objectives of the study were to profile anglers and describe their site/management
preferences. This study utilized an on-site interview and mail-back questionnaire at fee-fishing establishments in West Virginia
(n = 212). Factor analysis of desired recreation experiences yielded five factors: Experience nature & adventure, Stress release & relaxation, Trophy fishing, Escape, and Family time. Cluster analysis showed that these anglers can be segmented into two distinct clusters, differing by sociodemographic characteristics,
fishing behavior, and site/management preferences. The findings from this study provide baseline data to aid public resource
managers and fee-fishing business owners in determining how to provide satisfying outdoor experiences and deliver desired
services on-site. Future research will be needed from additional fee-fishing sites to obtain more detail about this outdoor
recreation cohort and be able to generalize to a larger population of participants. 相似文献
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While convenient and often used, on-site surveys are biased by the fact that users who visit the site more often are proportionately more likely to be sampled. This so-called avidity or size biased sampling results in over-estimating the visitation patterns of the average user. This analysis develops a rule of thumb method that may easily be applied by recreation site managers to visitation data collected on-site in order to infer behavior of the average user of the site. The key assumption that drives the derivation is that the visitation data of users is logarithmically distributed. To evaluate the methodology, we analyze several data sets of recreational users assuming that they reflect the populations of users and from these construct hypothetical on-site samples. 相似文献
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文章通过在唐山LNG项目建设现场HSE管理实践中的经验总结,结合中国石油集团公司提出的加强"三基"工作的要求,提出了一套HSE管理方法并应用于实践,取得了良好效果,为其他LNG项目建设提供了必要的借鉴与参考。 相似文献
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Recreation demand analysis under truncation, overdispersion, and endogenous stratification: an application to Gros Morne National Park 总被引:2,自引:0,他引:2
Using on-site survey data from Gros Morne National Park in Newfoundland, this paper estimates and compares several truncated count data models of recreation demand. The selected model accounts not only for the truncated and overdispersed nature of the data but also for endogenous stratification due to the oversampling of avid users. Moreover, the model that allows for a flexible specification of the overdispersion parameter dominates on the basis of goodness of fit. The results are used to estimate the users' value of access to the park. 相似文献
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Day L 《Journal of environmental quality》2004,33(6):1989-1996
On-site septic systems require appropriate soil characteristics to provide effective wastewater treatment. The objective of this study was to evaluate siting practices and treatment efficacy of on-site septic systems within the Cannonsville Reservoir watershed (115900 ha) in the state of New York. Using digital soil survey data, a database of on-site conditions was developed from more than 1100 existing septic system siting records. Soil map units were grouped into four classes based on their suitability to meet common septic system design criteria. A geographic information system was found to be a useful tool for assessment and visual display of septic system and landscape information. Geographic information system analysis indicated that while 80% of soils in the watershed were found to have characteristics that interfere with septic system function, 69% of septic systems installed were of designs suited for soils with no or few restrictive parameters. Since the designs of many septic systems have relied heavily on horizontal distance to streams (mean = 130 m) to provide adequate treatment, potential failures would lead to discharge of compounds of environmental concern, such as phosphorus, with public health implications. The results imply that many septic systems functioning in the watershed are in need of design improvements. 相似文献
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Past on-site experience was linked to the crowding perceptions and use displacement of 383 on-site visitors to the peri-urban
Danube Floodplains National Park, Austria. Three visitor groups were determined according to their area experience: local
residents from Vienna and rural communities, having the highest level of experience; regional visitors from the city and eastern
Austria; and tourists from Austria and abroad with the lowest degree of experience. Crowding perceptions were significantly
different across the user groups. More than 50% of local residents perceived the national park as crowded, whereas only 27%
of regional visitors and 19% of tourists reported such an evaluation. Even among local residents and regional visitors, respondents
with more on-site experience expressed a greater impression of a crowded park. Differences in crowding evaluations between
local rural and urban residents and between regional rural and urban visitors were not found. For 27% of local residents and
15% of regional visitors, use levels were so unacceptable that they displaced temporally and spatially, whereas use displacement
was relatively irrelevant for tourists. The use displacement strategies involved differ among the three user groups. Management
implications were discussed, taking the specific situation of the small national park on the urban-rural fringe into consideration. 相似文献