全文获取类型
收费全文 | 133篇 |
免费 | 3篇 |
国内免费 | 1篇 |
专业分类
环保管理 | 85篇 |
综合类 | 4篇 |
基础理论 | 24篇 |
环境理论 | 1篇 |
污染及防治 | 14篇 |
评价与监测 | 5篇 |
社会与环境 | 4篇 |
出版年
2022年 | 2篇 |
2021年 | 8篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 1篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 4篇 |
2008年 | 6篇 |
2007年 | 9篇 |
2006年 | 7篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 7篇 |
2002年 | 2篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有137条查询结果,搜索用时 15 毫秒
61.
62.
There is concern that elevated levels of selenium found in the source water of a newly formed wetland park in Las Vegas, Nevada,
may have detrimental effects on local wildlife. In this study, we collected and analyzed water samples monthly for a three
year period from the inflow and outflow of the system. We also gathered dominant aquatic plants and selected terrestrial plants
and analyzed the water and plant tissues (root, shoot, leaf and flower) for selenium by high resolution Inductively Coupled
Plasma Mass Spectrometer. Except for storm events and the introduction of an alternative low selenium content source water
during summer low-flow conditions, selenium in the water was relatively stable. The concentration in the outflow tended to
be slightly lower than the inflow. Concentrations of selenium in the dominant plant taxa in this wetlands were typical of
ecosystems in the western United States and varied by taxa, tissue type, localized conditions (e.g., contact with selenium-laden
water), and to a lesser extent, seasons. Selenium in the aquatic plant spiny naiad (Najas marina) was relatively high and may pose an ecological risk to wildlife during the late spring and summer. Additional work is underway
investigating aquatic food chain accumulations of selenium as well as mass balance of selenium in the system. 相似文献
63.
我们想要保护水生生态环境,通过测试数以千计的化学物质和成百上千的水生物种之间交互作用,得到成千上万的结果,但仍然不可能考虑到所有物质的混合情况。污染物对野生鱼类的内分泌干扰作用的课题推动了人们对如药物之类的微污染物的研究。尽管我们担心鱼类会因污染而繁殖能力下降,但并没有足够的证据表明鱼类种群处于危险之中。事实上,许多鱼类生物学家认为,在过去的30 - 40年里,鲤科的数量已经在逐步恢复中。目前的风险评估的关键在于其核心假设,也就是实验室观测或者模型预测的结果简单地适用于群体水平,显而易见这个假设是值得质疑的。
我们明白了疏于监测野生动物种群的变化成为了我们的环境保护战略的关键弱点。如果我们不知道水生野生动物物种是在减少或增加,那么我们研究的其他生态毒理行为又有多少价值呢?
精选自Andrew C. Johnson, John P. Sumpter. Are we going about chemicals risk assessment for the aquatic environment the wrong way?. Environmental Toxicology and Chemistry: Volume 35, Issue 7, pages 1609–1616, July 2016.
DOI: 10.1002/etc.3441
详情请见http://onlinelibrary.wiley.com/doi/10.1002/etc.3441/full 相似文献
64.
Poncelet EC 《Environmental management》2001,27(1):13-25
Multistakeholder collaboration in the environmental realm has been increasing steadily over the past decade. This trend is
responding to several stimuli, including dissatisfaction with current regulatory regimes, a liberal economic climate emphasizing
global competitiveness and short-term returns, and the growing roles of the business and nongovernmental organization sectors
in the environmental policy arena. This paper grows out of ethnographic research conducted between 1994 and 1998 with four
environmental partnerships in Europe and the United States. The research found all of these partnerships to be marked by practices
of conflict minimization and diffusion. Drawing upon illustrative data from one of these case studies, a European Union level
initiative aimed at enabling sustainable development in Europe, the paper asks why this was the case, especially given the
diverse political and economic interests at stake and the history of contentious relations between the sectors in other venues.
Employing a theoretical perspective highlighting the sociohistoric factors involved in these processes, the paper suggests
that this proclivity toward nonconfrontational behavior stems in part from two sources: a prominent cultural model that conceptualizes
the partnership process as fundamentally nonconflictual in nature, and the promotion of the discourse of ecological modernization
over other competing discourses. The paper explores some of the implications of this finding and concludes that environmental
partnerships characterized by such nonconfrontational practices risk inadvertently encouraging the delegitimization of conflictual
approaches to environmental action and engendering a retreat from radical thinking and innovative environmental solutions. 相似文献
65.
McDuff MD 《Environmental management》2001,27(5):715-727
Stakeholder participation has become a key factor in the success of grassroots conservation and natural resource management
programs. Yet the majority of program evaluations are conducted by external consultants for the purposes of accountability,
rather than program improvement. Too often, systematic evaluations of conservation programs are not conducted at all. The
objective of this study was to build the capacity of a grassroots conservation organization to conduct participatory evaluation, involving project stakeholders in the design, implementation, and use of evaluation. The study applied a conceptual
model for participatory evaluation to the Wildlife Clubs of Kenya (WCK), the largest grassroots conservation program for youth
in Africa, involving more than one million youth since 1968.
Seven trainings in participatory evaluation were conducted with WCK staff, teachers, and community members. The 120 participants,
representing nine WCK regions with 800 clubs, showed a significant increase in attitudes and knowledge regarding evaluation,
as reflected by mean test scores before and after training. To institutionalize evaluation at WCK, existing organizational
practices were assessed and used as a foundation for developing an evaluation system.
Based on club competitions, a new evaluation initiative was launched called the WCK Incentive Program. Participants in all
seven workshops identified indicators and sources of evidence for this evaluation system, which now serves as a basis for
rewarding outstanding performance in WCK. This study revealed the importance of incentives for evaluation, the need to build
on existing structures to promote organizational learning, and the necessity for the conservation community to commit resources
to capacity building in participatory evaluation. 相似文献
66.
Elwood L. Shafer Robert Carline Richard W. Guldin H. Ken Cordell 《Environmental management》1993,17(5):669-682
The travel clost method (TCM) and contingent valuation method (CVM) were used to evaluate the economic value of six different
ecotourism activities involving observation of wildlife in Pennsylvania. The six activities were: catch-and-release trout
fishing; catch-and-release trout fishing with fly-fishing equipment; viewing waterfowl; watching elk; observing migration
flights of raptors; and seeing live wildlife in an environmental education setting. TCM results provided significant statistical
relationships between level of use and travel costs for the two types of trout fishing activities. CVM provided estimates
of consumer surplus for the other four sites. The consumers' surplus value (1988 dollars) of all six activities to participants
amounted to a total of more than $1.28 million annually—twice the total out-of-pocket expenditures of approximately $640,000
spent to visit the sites. The economic amenity values of the six activities compare favorably with similarly derived values
in other studies for hunting, fishing, hiking, and backpacking in dispersed recreation environments and wilderness areas in
western states. 相似文献
67.
Nuclear and nonnuclear industrial and research activities have been conducted on the Hanford reservation since 1943. Materials originating from these activities may enter the surrounding environment through releases of airborne and liquid effluents and solid wastes. Concern about the environmental effects of these releases has evolved over the past four decades into a comprehensive onsite and offsite monitoring program. Today, environmental monitoring to assess potential impacts of released materials includes field sampling and chemical and physical analyses of air, ground and surface water, fish and wildlife, soil, vegetation, and foodstuffs. This paper reviews the history of Hanford operations and summarizes the current environmental monitoring program and its major findings. Mathematical models based on monitoring data show that radiation doses to people living near the Hanford site are well below existing regulatory standards. Only trace amounts of radionuclides from Hanford have been detected in the offsite environment. 相似文献
68.
A method to create simplified versions of existing habitat suitability index (HSI) models 总被引:5,自引:0,他引:5
James S. Wakeley 《Environmental management》1988,12(1):79-83
The habitat evaluation procedures (HEP), developed by the US Fish and Wildlife Service, are widely used in the United States to determine the impacts of major construction projects on fish and wildlife habitats. HEP relies heavily on habitat suitability index (HSI) models that use measurements of important habitat characteristics to rate habitat quality for a species on a scale of 0 (unsuitable) to 1.0 (optimal). This report describes a method to simplify existing HSI models to reduce the time and expense involved in sampling habitat variables. Simplified models for three species produced HSI values within 0.2 of those predicted by the original models 90% of the time. Simplified models are particularly useful for rapid habitat inventories and evaluations, wildlife management, and impact assessments in extensive areas or with limited time and personnel. 相似文献
69.
本文阐述了污染赔偿纠纷行政处理的基本原则,重点讨论赔偿责任的认定和赔偿金额的确定,并对进一步完善行政处理制度提出了自己的见解。 相似文献
70.
This paper analyzes five major causes of park-people conflicts that have occurred in Nepal's Royal Chitwan National Park.
The causes include illegal transactions of forest products from the park, livestock grazing in the park, illegal hunting and
fishing, crop damage, and threats to human and animal life caused by wild animals from the park. The conflicts indicate a
reciprocal relationship between the park and local people. They reflect the attitudes of local people and representatives
of the park authority whose priorities and objectives largely diverge. The results show that people settled adjacent to the
park are heavily dependent on its resources. Even in places where some, albeit few alternative sources exist, local people
continue to trespass the park boundary as these sources are inadequate to ensure the fulfillment of local people's resource
needs. Illegal transactions of resources continue throughout the year; however, they are less intense during summer due to
flooding caused by the Rapti River, which forms the park boundary towards the northern section where this study is conducted.
The frequency of local people's visits to the park is mainly determined by their age, distance between homesteads and park,
and volume of crop loss caused by wild animals. Crop damage is the function of size of landholding, distance, and frequency
of crop raid. Local people claim that they have no intention of letting their livestock graze in the park; however, the dense
vegetation of the park attracts livestock grazing on riverbanks just outside the open park boundary. Many head of livestock
are killed by carnivores of the park. Human casualties are mainly caused by sloth bear (Melursus ursinus), tiger (Panthera tigris), wild pig (Sug scrofa), and rhinoceros (Rhinoceros unicornis). There had been some earlier attempts to reconcile the conflicts by offering local people different kinds of compensations;
however, these were unsuccessful measures. An integrated approach is essential if efforts to resolve the park-people conflicts
are to succeed. The government is in the process of launching a project that aims to resolve the inherent problems with such
an approach. Suggestions are made to incorporate some key elements, such as maintaining effective communication between various
parties and the potential for wildlife conservation among local people. 相似文献