全文获取类型
收费全文 | 15174篇 |
免费 | 837篇 |
国内免费 | 5160篇 |
专业分类
安全科学 | 1200篇 |
废物处理 | 868篇 |
环保管理 | 1276篇 |
综合类 | 8420篇 |
基础理论 | 2459篇 |
环境理论 | 3篇 |
污染及防治 | 4816篇 |
评价与监测 | 735篇 |
社会与环境 | 818篇 |
灾害及防治 | 576篇 |
出版年
2024年 | 26篇 |
2023年 | 263篇 |
2022年 | 786篇 |
2021年 | 697篇 |
2020年 | 608篇 |
2019年 | 512篇 |
2018年 | 608篇 |
2017年 | 758篇 |
2016年 | 694篇 |
2015年 | 881篇 |
2014年 | 1192篇 |
2013年 | 1523篇 |
2012年 | 1332篇 |
2011年 | 1321篇 |
2010年 | 1044篇 |
2009年 | 993篇 |
2008年 | 1091篇 |
2007年 | 855篇 |
2006年 | 795篇 |
2005年 | 565篇 |
2004年 | 462篇 |
2003年 | 537篇 |
2002年 | 480篇 |
2001年 | 400篇 |
2000年 | 419篇 |
1999年 | 337篇 |
1998年 | 347篇 |
1997年 | 311篇 |
1996年 | 289篇 |
1995年 | 214篇 |
1994年 | 163篇 |
1993年 | 163篇 |
1992年 | 139篇 |
1991年 | 97篇 |
1990年 | 71篇 |
1989年 | 37篇 |
1988年 | 40篇 |
1987年 | 10篇 |
1986年 | 24篇 |
1985年 | 12篇 |
1984年 | 14篇 |
1983年 | 10篇 |
1982年 | 17篇 |
1981年 | 8篇 |
1978年 | 6篇 |
1975年 | 2篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 5篇 |
1971年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
21.
南水北调的资源、环境和社会效应 总被引:6,自引:0,他引:6
俞澄生 《长江流域资源与环境》1994,3(3):265-270
建设南水北调工程,对中国的水资源在地区间进行合理调配,将带动其他资源的合理配置与利用,还可改善环境,是社会发展的需要,又受社会条件制约,一旦突破建成,将促使社会生产力发生新的飞跃并持续发展。 相似文献
22.
The alpine musk deer (Moschus chrysogaster) is a key species of some terrestrial ecosystems, it has an important economic and conservative significance as a kind of medical animal in China. Due to the interaction between natural forces and human disturbance, the habitats of alpine musk deer are fragmented and isolated in different mountains and the populations are confronted with many problems of survival. In this paper, we discuss the impact of habitat fragmentation and isolation on alpine musk deer populations based on the investigation on the population densities and sizes and environmental factors in different reserves, as well as on the analysis of its ecological adaptability. We found that the alpine musk deer has strong ecological adaptability; the population development of alpine musk deer may benefit from the reduction of the forest area and even from the fragmentation and isolation of the habitat to a certain extent. However, deforestion should not be encouraged only for the alpine musk deer population, but should also be based on the overall consideration of biodiversity conservation. 相似文献
23.
文章从四个方面阐释学生文化体系的构成,即重在打基础,鼓励学生个性化发展;培植防灾学院自己的学生文化“精英”;创新与创业是学生文化的闪光点;培育一个好的学生文化的管理环境。做到此四点,就可办一个好的、有特点的、合格的高等学校。本文有的放矢,用事实来说话。 相似文献
24.
Methodological Basis of Ecological Safety Standards for the Technogenic Impact of Mineral Resource Exploitation 总被引:1,自引:0,他引:1
A new methodological approach to the development of biological and technological safety standards for the impact of underground mining on the natural biota is proposed. 相似文献
25.
26.
27.
长江中游平原湖区农业开发地域分工与农产品专业化生产研究 总被引:6,自引:1,他引:5
农业生产地域分工与农产品专业化生产是使农业从自然经济阶段向以市场为导向的商品农产品生产转变的一个标志。本文在分析该区农业布局现状及其存在问题的基础上,提出了农业总体布局的设想与不同类型地域农业开发的主攻方向与对策,并对市场经济体制下粮食、棉花、猪、禽、水产品等农产品生产基地的地域选择、建设规模与技术措施等进行了探讨。 相似文献
28.
Dynamics and Causation of Environmental Equity, Locally Unwanted Land Uses, and Neighborhood Changes
Feng Liu 《Environmental management》1997,21(5):643-656
/ Why are some environmental risks distributed disproportionately in the neighborhoods of the minorities and the poor? A hypothesis was proposed in a recent study that market dynamics contributed to the current environmental inequity. That is, locally unwanted land uses (LULUs) make the host communities home to more poor people and people of color. This hypothesis was allegedly supported by a Houston case study, whereby its author analyzed the postsiting changes of the socioeconomic characteristics of the neighborhoods surrounding solid waste facilities. I argue that such an analysis of postsiting changes alone is insufficient to test the causation hypothesis. Instead, I propose a conceptual framework for analysis of environmental equity dynamics and causation. I suggest that the presiting neighborhood dynamics and the characteristics of control neighborhoods be analyzed as the first test for the causation hypothesis. Furthermore, I present theories of neighborhood change and then examine alternative hypotheses that these theories offer for explaining neighborhood changes and for the roles of LULUs in neighborhood changes. These alternative hypotheses should be examined when analyzing the relationship between LULUs and neighborhood changes in a metropolitan area. Using this framework of analysis, I revisited the Houston case. First, I found no evidence that provided support for the hypothesis that the presence of LULUs made the neighborhoods home to more blacks and poor people, contrary to the conclusion made by the previous study. Second, I examined alternative hypotheses for explaining neighborhood changes-invasion-succession, other push forces, and neighborhood life-cycle; the former two might offer better explanation.KEY WORDS: Environmental equity and justice; Locally unwanted lane uses; Siting; Market dynamics; Invasion-succession; Neighborhood changes 相似文献
29.
Environment, Development and Sustainability - Ecological welfare performance is a measure of the relationship between input ecological resources and output welfare, and it reflects the sustainable... 相似文献
30.
Jiao Youzhou Xue Huizan He Chao Wang Zigang Ma Xiaoran Liu Xinxin Liu Liang Chang Chun Petracchini Francesco Li Panpan 《Environment, Development and Sustainability》2022,24(4):4709-4726
Environment, Development and Sustainability - Anaerobic digestion (AD) is an attractive straw resource treatment technology as it can improve the utilization efficiency of straw resource. Raw straw... 相似文献