全文获取类型
收费全文 | 1667篇 |
免费 | 147篇 |
国内免费 | 289篇 |
专业分类
安全科学 | 160篇 |
废物处理 | 23篇 |
环保管理 | 269篇 |
综合类 | 984篇 |
基础理论 | 212篇 |
环境理论 | 2篇 |
污染及防治 | 103篇 |
评价与监测 | 62篇 |
社会与环境 | 213篇 |
灾害及防治 | 75篇 |
出版年
2024年 | 3篇 |
2023年 | 26篇 |
2022年 | 29篇 |
2021年 | 45篇 |
2020年 | 52篇 |
2019年 | 51篇 |
2018年 | 45篇 |
2017年 | 79篇 |
2016年 | 69篇 |
2015年 | 76篇 |
2014年 | 75篇 |
2013年 | 135篇 |
2012年 | 142篇 |
2011年 | 150篇 |
2010年 | 111篇 |
2009年 | 116篇 |
2008年 | 90篇 |
2007年 | 121篇 |
2006年 | 118篇 |
2005年 | 89篇 |
2004年 | 65篇 |
2003年 | 50篇 |
2002年 | 58篇 |
2001年 | 36篇 |
2000年 | 35篇 |
1999年 | 36篇 |
1998年 | 23篇 |
1997年 | 24篇 |
1996年 | 25篇 |
1995年 | 28篇 |
1994年 | 14篇 |
1993年 | 15篇 |
1992年 | 16篇 |
1991年 | 16篇 |
1990年 | 5篇 |
1989年 | 10篇 |
1988年 | 4篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有2103条查询结果,搜索用时 703 毫秒
601.
Assessing carrying capacities of coastal areas in France 总被引:1,自引:0,他引:1
This paper provides the methodological framework for carrying capacity assessment through a set of indicators, as implemented
in a French case study. The approach aims to help the State and local governments of coastal areas facing population growth
and important touristic flows to undergo a local development strategy that does not imperil their territorial strategic resources.
This work shows how situations of dysfunction or saturation points have interlinked consequences on environmental, social
and economic resources, justifying a crosswise assessment. 相似文献
602.
603.
604.
What supports the adaptive capacity of watershed governance? Using document review, interviews, and network diagrams, we analyze how structural attributes of a governance network emerged and co-evolved with changes in biophysical conditions in a case study of a small watershed in northeast Ohio. Results indicate that the network governance structure that emerged evolved to become a hybrid of two different structural forms that diversified stakeholder engagement, generated social capital, improved social learning, and stimulated change in management practices, all of which have enhanced adaptive capacity. A significant challenge to adaptive capacity arises, however, as network governance has come to rely significantly on a centralized organization to broker relationships for information and other resources. 相似文献
605.
2010年本实验室开始生物质对柴油的吸附实验,和前人的结论一致,生物质热改性后其吸油和漂浮性能提高,但成本增加很多。受到前人复合吸油材料的启发,2012年开展了蒲绒-芦苇机械混合复合材料吸油和漂浮性能的研究,并采用正交实验对影响除油效果的因素进行优化。结果表明,蒲绒-芦苇复合材料较之芦苇吸油性能提高,且比各组分的叠加饱和吸油量还高。震荡使芦苇的漂浮率明显降低,但对蒲绒及复合材料的影响较小。正交实验结果显示,投加量0.7g,油膜厚度0.55 mm,不震荡时,蒲绒除油最佳;在相同条件下,粒径为380~500μm的芦苇除油最佳,蒲绒和该粒径的芦苇按质量比为1∶4混合成的复合材料的除油效果最佳。 相似文献
606.
Lesley Head Chris Gibson Nicholas Gill Chantel Carr Gordon Waitt 《Local Environment》2016,21(12):1467-1481
Cultural change is critical to climate change responses, but the in-depth qualitative research that investigates culture is necessarily conducted at scales difficult to integrate with policy. A focus of climate change mitigation and adaptation is affluent developed world households. Adapting methods used elsewhere in social science, we report and assess a meta-ethnography of household sustainability research, scaling up findings from 12 studies encompassing 276 Australian households. Seven themes are dominant: family concerns are central to household practice; adaptiveness is contingent but more pervasive than often assumed; households make sense of climate change not through abstract arguments, but through physical resources and materials; boundaries of the home space are dynamic and subjective; daily time is an important currency; paradoxes abound among everyday practice; and privacy and a sense of autonomy are prioritised. Insights from the method include new light on familiar themes when seen through an environmental lens, thickening and triangulation of existing research, and a stronger basis for international comparisons. Some findings have straightforward application to policy, others identify potential areas of risk and resistance, others still are more conceptual. We conclude the method has considerable potential and is worth developing further, providing a critical perspective is maintained. 相似文献
607.
Companies bear primary responsibility for low-carbon economy, thus relevant low-carbon policies should be set properly to guide them and to ensure their low-carbon production effectively. To solve the problems generated during low-carbon development, this article verifies the existence of the transmission path and strength. This verification includes mediating variables of companies’ willingness and capacity to conduct low-carbon production, a transmission mechanism through incentive path and resources protection, and questionnaire data of agricultural companies. Conclusions show that the low-carbon policies have obvious positive effects on willingness of corporation; the basic service-oriented policy has a significantly promoting effect on low-carbon production capacity; and low-carbon production performance is positively influenced by willingness as well as capability. Aiming at a better transmission path, some corresponding recommendations have been put forward in the end. 相似文献
608.
This article proposed the concept of"climate capacity"as a way of measuring human’s adaptiveness to climate change.This article also focused on the related concepts like ecological carrying capacity,water resources carrying capacity,land carrying capacity as well as population carrying capacity.The concept of climate capacity was articulated against a background of global climate and environmental change.Essentially,China’s efforts to adapt to climate change was a matter of improving climate capacity,which is the ecosystem as well as the frequency,the intensity and the scale of human’s social activities that the climatic resources of a particular geographic area were supposed to support.The climate capacity has two components.One is the natural climate capacity,which includes temperature,sunlight,precipitation,extreme climatic events,etc.The other is the derived climate capacity,which includes water resources,land resources,ecological systems,climatic risks,etc.The climate capacity can be developed or be transferred between regions by taking engineering,technology or regime-based adaptive measures.However,these adaptive measures must be implemented under the principle of economic rationalism,ecological integrity,climate protection,and social justice.It is expected that by combining the climate capacity and its threshold value with the assessment of climate change risks,we are able to predict the optimal population carrying capacity and the scale of socioeconomic development,and furthermore,provide policy support for the socioeconomic development strategy and adaptive planning.In the regions with high climate capacity,there is a symbiotic relationship between adaptation and socioeconomic development.But,in the regions with limited climate capacity,irrational development may further damage the environment.Taking the Yangtze River delta,a region with high climate capacity,and a region of Ningxia,a region with limited climate capacity,as illustrative examples,the authors of this article analyzed the policy implications of climate capacity and further made suggestions on the problems of capacitylimited adaptation and development-driven adaptation.This article argued that the concept of climate capacity can not only be used as an analytical instrument of climate change economics,but also it can provide research support for planning regional adaptation and development with climate change impact and risk assessments. 相似文献
609.
利用ENVI4.8和Arcgis9.3软件对2001~2010年的遥感影像数据进行处理和分析,计算得出各年份的生态承载力。结合相关年份的社会经济数据,同时根据滇池流域的实际情况提取18个分析指标,运用相关分析和回归分析方法,对滇池流域生态承载力以及其与生态环境系统、资源环境系统、社会经济系统3个子系统要素的耦合关系进行分析。结果表明:(1)2001~2010年滇池流域的总生态承载力和人均生态承载力呈快速下降趋势,降幅达37.3%;耕地生态承载力呈下降趋势最明显,下降幅度达52.61%,但建设用地的生态承载力上升幅度达27.08%。(2)滇池流域生态承载力与三大系统要素相关性较好,其耦合形态呈"J"、"L"型、"U"型和倒置的"S"型等。(3)对耦合形态的形成机理进行分析,其结果表明:城镇化、社会经济的发展以及流域内粗放型的经济增长方式对形成这种耦合形态的影响较大。 相似文献
610.