全文获取类型
收费全文 | 10167篇 |
免费 | 921篇 |
国内免费 | 1117篇 |
专业分类
安全科学 | 1184篇 |
废物处理 | 152篇 |
环保管理 | 2479篇 |
综合类 | 5495篇 |
基础理论 | 936篇 |
环境理论 | 54篇 |
污染及防治 | 394篇 |
评价与监测 | 679篇 |
社会与环境 | 778篇 |
灾害及防治 | 54篇 |
出版年
2024年 | 46篇 |
2023年 | 122篇 |
2022年 | 165篇 |
2021年 | 254篇 |
2020年 | 274篇 |
2019年 | 287篇 |
2018年 | 275篇 |
2017年 | 513篇 |
2016年 | 519篇 |
2015年 | 540篇 |
2014年 | 482篇 |
2013年 | 740篇 |
2012年 | 748篇 |
2011年 | 721篇 |
2010年 | 602篇 |
2009年 | 554篇 |
2008年 | 386篇 |
2007年 | 630篇 |
2006年 | 632篇 |
2005年 | 577篇 |
2004年 | 503篇 |
2003年 | 473篇 |
2002年 | 357篇 |
2001年 | 348篇 |
2000年 | 342篇 |
1999年 | 233篇 |
1998年 | 172篇 |
1997年 | 146篇 |
1996年 | 105篇 |
1995年 | 124篇 |
1994年 | 69篇 |
1993年 | 67篇 |
1992年 | 42篇 |
1991年 | 26篇 |
1990年 | 22篇 |
1989年 | 16篇 |
1988年 | 10篇 |
1986年 | 7篇 |
1984年 | 5篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 9篇 |
1978年 | 4篇 |
1977年 | 7篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1974年 | 4篇 |
1973年 | 5篇 |
1972年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
991.
我国是发展中的国家,农业在国民经济中占有十分重要的地位,环境污染和生态破坏是农业潜伏着的生态危机,也是农业发展过程中亟待解决的重大问题。如何从我国农业环境问题的特点和农业经济现状出发,制定出与农业经济发展相适应遥农业环境保护战略,是我国农业发展和环境保护工作中的一项重要任务。本文就我国农业环境保护的战略地位和作用、指导思想和方针、目标和重点、措施等一系列战略问题,进行初步探讨。 相似文献
992.
解读《建设项目环境保护管理条例》修订的要点,剖析当前石油化工建设项目环境保护管理体系的核心由“环评制度”逐步向“排污许可证制度”转变的现实情况,及与此相应的环保行政主管部门对建设单位和设计咨询单位的环保工作提出的新要求。从实际工作出发,总结了中国石化系统和民营企业石油化工建设项目在新形势下环保管理工作的特点、遇到的问题及解决方案。 相似文献
993.
Donald S. P. Puccini 《Journal of the American Water Resources Association》1971,7(6):1144-1152
The recent world-wide trend towards centralization of all environmental management functions into one regulatory agency has illustrated the necessity for resources management agencies to adopt a total systems viewpoint. Environmental systems are typically complex and multi-dimensional in nature. Mathematical models for the management of air, water and land resources have found wide acceptance among planners and decision-makers. Ecological models of life processes have not reached the same state of development or acceptance. A general review of ecological systems theory and examples of the types of ecological models that have been developed to date arc presented in this paper. With this material as a background and given the vast literature on engineering and economic models, a conceptual framework for an approach to environmental studies and the analysis of polluted environmental systems is presented. 相似文献
994.
Damodar S. Airan 《Journal of the American Water Resources Association》1973,9(5):1035-1040
ABSTRACT: Piped water supply and sewerage have been taken almost for granted in the developed countries. However, most people in the United States have little knowledge of the condition of public health amenities in the developing countries. The paper reviews the importance, background and current status of water and wastewater facilities in India. The relative situation in urban and rural areas, conventional practices in environmental hygiene, the programs for improvement and the problems involved with possible solutions are given. The case history of a town is also included for illustrative purposes. 相似文献
995.
刘利柱 《中国环境管理干部学院学报》1999,(4)
实施可持续发展战略,就是要实现经济建设与环境保护协调发展。本文从佳木斯市实际出发,提出了环境保护职能部门如何参与经济结构调整以实现经济与环境协调发展的意见和建议。 相似文献
996.
997.
论建立和完善我国环境税 总被引:7,自引:0,他引:7
谭立 《中国人口.资源与环境》1999,9(1):49-53
本文在重新认识税收作用、资源价值和税收优惠政策的基础上,提出了建立环境税、完善资源能源税、逐步实施费改税、公平税负与对等环境税附加的建议。 相似文献
998.
Will Limits of the Earth's Resources Control Human Numbers? 总被引:1,自引:1,他引:0
David Pimentel O. Bailey P. Kim E. Mullaney J. Calabrese L. Walman F. Nelson X. Yao 《Environment, Development and Sustainability》1999,1(1):19-39
The current world population is 6 billion people. Even if we adopted a worldwide policy resulting in only 2.1 children born per couple, more than 60 years would pass before the world population stabilized at approximately 12 billion. The reason stabilization would take more than 60 years is the population momentum – the young age distribution – of the world population. Natural resources are already severely limited, and there is emerging evidence that natural forces already starting to control human population numbers through malnutrition and other severe diseases. At present, more than 3 billion people worldwide are malnourished; grain production per capita has been declining since 1983; irrigation per capita has declined 12% during the past decade; cropland per capita has declined 20% during the past decade; fish production per capita has declined 7% during the past decade; per capita fertilizer supplies essential for food production have declined 23% during the past decade; loss of food to pests has not decreased below 50% since 1990; and pollution of water, air, and land has increased, resulting in a rapid increase in the number of humans suffering from serious, pollution-related diseases. Clearly, human numbers cannot continue to increase. 相似文献
999.
Delivering on the Promise of Agroforestry 总被引:1,自引:0,他引:1
Pedro A. Sanchez 《Environment, Development and Sustainability》1999,1(3-4):275-284
Agroforestry – the traditional practice of growing trees on farms for the benefit of the farm family and for the environment – was brought from the realm of indigenous knowledge into the forefront of agricultural research less than two decades ago. It was promoted widely as a sustainability-enhancing practice that combines the best attributes of forestry and agriculture. Based on principles of natural resource management and process-oriented research, agroforestry is now recognized as an applied science, that is instrumental in assuring food security, reducing poverty and enhancing ecosystem resilience at the scale of thousands of smallholder farmers in the tropics.Trees on farms provide both products and services: they yield food, fuelwood, fodder, timber and medicines, which farm families can use at home or take to market to bring in much-needed cash; they replenish organic matter and nutrient levels in soils and they help control erosion and conserve water. The International Centre for Research in Agroforestry, and its partners, are working to integrate the functions of trees with policy and institutional improvements that aim at facilitating wide-scale adoption by farmers.Two examples described in this paper are replenishing soil fertility in sub-Saharan Africa using short-term improved tree and shrub fallows and the results of agroforestry research to support significant land tenure policy in southeast Asia.Although just one option in sustainable land-use, science-based agroforestry has the potential to produce economically, socially and environmentally sound results for the billions of people who depend on this ancient practice and modern science. 相似文献
1000.
Simon Niemeyer 《Journal of Environmental Policy & Planning》2020,22(1):16-29
ABSTRACTEcological democracy confronts a challenge of not only reconciling democracy and ecology, but doing so where human activities and their environmental consequences are increasingly global. Deliberative scholars dealing with these issues emphasise reflexive governance, involving the contestation of discourses, as part of the solution, mostly aimed at high-level institutions and intergovernmental cooperation. However, even at this level democracy demands responsiveness to the citizen. To this end, the paper explores citizen-level deliberation to inform possibilities for ecological democracy writ large, via a growing literature on deliberative governance and polycentrism. Different system levels are connected via ecologically reflexive capacity and the discursive conditions under which it is enhanced, including in small-scale minipublics. This understanding informs mechanisms for ‘scaling up’ deliberative quality to the wider public sphere via regulating the manipulation of public discourse. Minipublic deliberation, properly harnessed, can serve to decontaminate public debate of anti-reflexive strategic arguments and reshape public discourse. Such anti-reflexive strategies seek to shape the public will, specifically by de-emphasising ecology via intuitive arguments that short-cut public reasoning. Acting as discursive regulatory trustees, minipublics can improve reflexivity in the wider system via a nested polycentric approach that discursively connects citizens’ deliberation to the global system both horizontally and vertically. 相似文献