首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   844篇
  免费   115篇
  国内免费   24篇
安全科学   25篇
废物处理   2篇
环保管理   447篇
综合类   242篇
基础理论   73篇
环境理论   31篇
污染及防治   36篇
评价与监测   14篇
社会与环境   75篇
灾害及防治   38篇
  2024年   3篇
  2023年   15篇
  2022年   38篇
  2021年   57篇
  2020年   56篇
  2019年   63篇
  2018年   60篇
  2017年   82篇
  2016年   101篇
  2015年   71篇
  2014年   29篇
  2013年   74篇
  2012年   22篇
  2011年   41篇
  2010年   22篇
  2009年   31篇
  2008年   38篇
  2007年   31篇
  2006年   28篇
  2005年   16篇
  2004年   19篇
  2003年   11篇
  2002年   8篇
  2001年   9篇
  2000年   9篇
  1999年   8篇
  1998年   2篇
  1997年   4篇
  1996年   3篇
  1995年   5篇
  1994年   1篇
  1993年   5篇
  1991年   1篇
  1989年   1篇
  1988年   1篇
  1987年   4篇
  1986年   3篇
  1985年   2篇
  1984年   1篇
  1981年   1篇
  1980年   1篇
  1979年   3篇
  1975年   1篇
  1974年   1篇
  1968年   1篇
排序方式: 共有983条查询结果,搜索用时 828 毫秒
621.
There have been many calls in policy and academia for more inclusiveness in science-policy interfaces, but there is as yet insufficient clarity as to what such inclusiveness means and how to achieve it in the context of international organisations. This paper analyses how inclusive the IPCC is across geographies and stakeholders. Building on the distinction between access and active participation, it examines the involvement of developing countries and NGOs in the Panel’s assessment process.The analysis shows that more inclusive institutional set-ups in international science-policy organisations do not automatically lead to greater credibility, salience and legitimacy of knowledge production processes (Mitchell et al., 2006). For instance, inclusive access does not per se guarantee active participation as the latter depends on a variety of factors including resources and the capacity of actors to engage. Furthermore, in institutional contexts the idea of inclusiveness is necessarily subject to operational interpretations. How these interpretations relate to the representativeness of those who participate in the process affects the relevance of knowledge to its users’ needs. Finally, there are political elements to inclusiveness as more powerful actors may be unwilling to renegotiate the balance of power to expand access to stakeholders.The paper concludes that these nuances should be taken into account in the IPCC and other international science-policy institutions. It also urges the Panel to address the developing country participation gap and explore institutional avenues for expanding access to non-state stakeholders in order to increase the credibility, salience and legitimacy of its processes and shift to solutions-oriented assessments.  相似文献   
622.
This paper reviews the possible future situation of the Rhone River in the Swiss part of its catchment. Physical processes in the Alps govern the behaviour of the Rhone from its source (Rhone Glacier) to the Lake of Geneva, and substantial changes are expected to occur in the amount and seasonality of precipitation, and in the response of snow and glaciers to a warming climate. As a result, discharge in the alpine part of the Rhone River is likely to undergo an increase in winter and early spring, but strongly decreases from late spring to late autumn. These changes in water regimes will certainly be accompanied by more frequent geomorphic hazards, related to increases in heavy precipitation events and the melting of permanently frozen grounds. The direct and indirect impacts of a warming climate will affect key economic sectors such as tourism, hydropower, and agriculture, while shifts in extreme events will have an impact on the vulnerability of infrastructure and a range of economic sectors and services. Projections of the future course of events can help in advance planning and decision making in order to alleviate some of the more negative consequences of climate and hydrological impacts on key economic sectors in the region. This paper will thus discuss issues related to current and future water governance in the region, whether water-related policies are sufficiently robust today to cope with what may be rapid changes in water availability and water use in coming decades, and to resolve possible rivalries between economic sectors that may be increasingly confronted with problems of water availability at critical times of the year.  相似文献   
623.
How does the resilience concept of nested relationships (panarchy) contribute to sustainability science and policy? Resilience at a particular level of organization, the community level in our case, is influenced by internal processes at that level. But it is also impacted by actions at lower levels of organization (individuals, households), and by drivers of change originating at higher levels (national level policies, globalized market forces). We focus on community level social-ecological systems, looking upwards and downwards from there. Our objective is to explore the connections of the community to other levels, the ways in which community resilience is impacted, and the implications of this for sustainability. Conventional disciplines specialize at different levels, a barrier to investigating multi-level interactions. Use of the panarchy concept helps contribute to the interdisciplinary understanding of resilience at the community (and other levels) by drawing attention to cross-scale relationships. From the effect of individual leadership to the implication of pandemics that move swiftly across levels, examples illustrate a diversity of ways in which community resilience is shaped in a multi-level world.  相似文献   
624.
Trees in cities supply ecosystem services, including cooling, storm water quality management, habitat, visual screening and softening of built form. There is an expanding interdisciplinary field encompassing biodiversity, ecosystem services, and stewardship networks in cities. However most of this work focuses on public greenspace. While much work has been done to demonstrate that trees on private land are an important complement to the public urban forest, and to understand the social drivers of such, less is known about the governance of private greenspace in cities. Private land contributes to a significant component of a city’s tree cover, particularly in cities characterised by low-density residential suburbs. It is important to understand the mechanisms that govern private tree cover, given the pace and scale of urbanisation globally. We combined policy and spatial analysis to examine the influence of larger and denser forms of residential development on suburban tree cover and the scope of contemporary governance measures. We interrogated tree cover patterns in the rapidly densifying and consolidating city of Brisbane, Australia, to show that private residential tree cover is explained by dwelling density, housing age, terrain slope, high school education, and household income. Results show significantly (30%) less tree cover in low-density residential suburbs developed since the early 1990s. We develop five governance principles for reversing the decline of urban trees on private residential property that may be transferable to other rapidly developing cities in around the world.  相似文献   
625.
This paper examines the participation opportunities and role of nominated experts from the Eastern European region in the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES). The governance of international knowledge-making spaces and events occurs through standardised institutional rules and expectations that affect experts as well as define accepted forms of knowledge. Within IPBES, experts may participate through United Nations Regional Groupings, which are regions that have complex geopolitical legacies and features. Between regions, experts have variable financial, networking and institutional capacities that in turn affect the operations and outputs of their contributions to science-policy interfaces. For IPBES, regional and localised environmental assessments and ecosystem services valuations require existing place-specific knowledge that may not be ‘available’, as well as understandings that are frequently in conflict with the standardised, homogenising practices of international environmental knowledge-making.  相似文献   
626.
/ Environmental settings were defined, through an overlay process, as areas of coincidence between categories of three mapped variables\Mland use, surficial geology, and soil drainage characteristics. Expert judgment was used in selecting factors thought to influence sediment and nutrient concentrations in the Albemarle-Pamlico drainage area. This study's findings support the hypothesis that environmental settings defined using these three variables can explain variations in the concentration of certain sediment and nutrient constituents. This finding underscores the importance of developing watershed management plans that account for differences associated with the mosaic of natural and anthropogenic factors that define a basin's environmental setting. At least in the case of sediment and nutrients in the Albemarle-Pamlico region, a watershed management plan that focuses only on anthropogenic factors, such as point-source discharges, and does not account for natural characteristics of a watershed and the influences of these characteristics on water quality, may lead to water-quality goals that are over- or underprotective of key environmental features and to a misallocation of the resources available for environmental protection.KEY WORDS: Environmental setting; Water quality; Watershed management; Nutrients; Sediment  相似文献   
627.
ABSTRACT: Extensive investigations have been undertaken to determine the utility of Landsat data for detecting and analyzing hydrologic characteristics of an interior watershed of Iran that drains to Daryachehye-Namak (salt lake). This interior playa serves as the terminus for surface water discharging to it from the Karaj, Shur, Saveh, and Ghom Rivers and ground water from their underlying aquifers. These drainage systems encompass heavily populated and industrial sectors of west central Iran, including Tehran. The result of this investigation demonstrates the applicability of Landsat data for mapping and monitoring water regimen as an aid in interpreting hydrologic conditions throughout this arid region. Fluctuation of water area in a playa lake, occupying the lowest part of this closed basin, was monitored on repetitive Landsat coverage. As the result of field investigations combined with optical and digital analyses of the Landsat data, fluctuating water depths were determined in order to estimate the volume of water present in this lake during various seasons. A comparison between stream discharge rates and the estimated volume of standing water make it possible to quantitatively evaluate the hydrologic regimen and to detect the significance of ground water discharge.  相似文献   
628.
This paper examines some of the social processes associated with disaster conditions. Utilising an asset‐based perspective of community capacity, it focuses on four types of normative systems to interpret the ability of communities to manage disasters through market‐, bureaucratic‐, associative‐, and communal‐based norms. Drawing on experience of a wildfire in the Crowsnest Pass region of southwest Alberta, Canada, in 2003, the tensions and compatibilities among these normative systems are evaluated through interviews with 30 community leaders. The results confirm the contributions of all types of social capital to resiliency, the necessity for rapid use of place‐based knowledge, and the importance of communication among all types and levels of agents. In addition, they point to the value of identifying and managing potential conflicts among the normative systems as a means to maximising their contributions. The integration of local networks and groups into the more general disaster response minimised the impacts on health and property.  相似文献   
629.
We observe a paradigm shift toward collaborative, multi‐level (from local to global) water management and suggestions for scale‐related design principles in the literature. Decision‐support tools are needed that can help achieve scale design principles. Mediated modeling (MM) refers to model building with people, rather than for people. This tool belongs to a family of participatory, systems oriented tools. This article explores their suitability for addressing challenges and principles that arise at multiple‐scales. MM can promote the understanding of cross‐level and cross‐scale links, creating salient, credible, and legitimate knowledge and encouraging boundary functions. Prerequisites for successful MM processes include an openness and willingness to collaborative learning. As new “meso‐level” institutions emerge to address complex challenges in water management collaboratively, tools like MM may play an important role in structuring dialogues, developing adaptive management capacity and advance an ecosystem services approach.  相似文献   
630.
This study aims to contribute to the field of urban planning by applying policy mobilities and transfer theories to a case study of the Capital Regional District and its 13 municipalities in British Columbia, Canada, in order to analyse and understand the dynamics of how sustainability is governed locally, with a special focus on barriers to sustainability policy mobility. The empirical material is primarily based on interviews with key stakeholders who guide policy development and creation in the region to inform an understanding of how sustainable development initiatives are developed and shared. This study finds that while there is interest and demand in sustainability, policy-makers are frustrated with their lack of success in implementing sustainability programmes. While there are some instances of policy sharing and transfer among municipalities in the region, there is a clear desire for more exchanges which would allow municipalities to respond more effectively to the demands placed upon them. Significant barriers to policy mobility are also identified, in particular, an unclear understanding of sustainability, a culture of competition and hostility among municipalities, difficulty with the process of transfer itself, and a lack of time, money and resources. These barriers are in part a result of a broken governance structure which does not provide clear leadership to the municipalities, sets municipalities to be competitive with each other and provides ineffective support for municipalities through an unwieldy regional administrative body which is not well regarded by the municipalities.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号