全文获取类型
收费全文 | 1910篇 |
免费 | 131篇 |
国内免费 | 151篇 |
专业分类
安全科学 | 114篇 |
废物处理 | 21篇 |
环保管理 | 284篇 |
综合类 | 543篇 |
基础理论 | 592篇 |
污染及防治 | 48篇 |
评价与监测 | 43篇 |
社会与环境 | 456篇 |
灾害及防治 | 91篇 |
出版年
2024年 | 3篇 |
2023年 | 24篇 |
2022年 | 39篇 |
2021年 | 51篇 |
2020年 | 53篇 |
2019年 | 51篇 |
2018年 | 33篇 |
2017年 | 54篇 |
2016年 | 63篇 |
2015年 | 57篇 |
2014年 | 61篇 |
2013年 | 141篇 |
2012年 | 99篇 |
2011年 | 122篇 |
2010年 | 105篇 |
2009年 | 81篇 |
2008年 | 89篇 |
2007年 | 123篇 |
2006年 | 120篇 |
2005年 | 107篇 |
2004年 | 101篇 |
2003年 | 84篇 |
2002年 | 90篇 |
2001年 | 80篇 |
2000年 | 74篇 |
1999年 | 46篇 |
1998年 | 31篇 |
1997年 | 22篇 |
1996年 | 38篇 |
1995年 | 30篇 |
1994年 | 24篇 |
1993年 | 36篇 |
1992年 | 18篇 |
1991年 | 13篇 |
1990年 | 9篇 |
1989年 | 7篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1973年 | 1篇 |
1971年 | 2篇 |
排序方式: 共有2192条查询结果,搜索用时 203 毫秒
651.
This paper explores peoples' indigenous survival strategies and assesses variations in people's ability to cope with floods in two flood‐prone villages in Bangladesh. It reveals that people continuously battle against flood vulnerability in accordance with their level of exposure and abilities, with varied strategies employed at different geophysical locations. The paper reports that people in an area with low flooding and with better socioeconomic circumstances are more likely to cope with impacts compared to people in areas with high and sudden flooding. Similarly, households' ability to cope varies depending on people's socioeconomic conditions, such as education, income and occupation. Although floods in Bangladesh generate socioeconomic misery and cause damage to the environment, health and infrastructure, people's indigenous coping strategies have helped them to reduce significantly their vulnerability. Such flood‐mitigating strategies should be well recognised and emphasised further via proper dissemination of information through an early‐warning system and subsequently external assistance. 相似文献
652.
基于中日比较的人口城市化对耕地影响机制研究 总被引:11,自引:0,他引:11
人口城市化是对耕地变动产生复合影响的一个过程.人口由农村向城市的转移是城市土地扩张的基本动力;这对耕地形成了占用的直接影响,我国人口城市比对耕地减少的直接影响度约在5%~10%之间.人口城市化对耕地的间接影响通过城市人均用地比农村少,土地利用集约度高,可以间接减少耕地占用;同时农村人口的减少,可以推动村镇合并,整理土地,增加耕地等途径来实现.因此,人口城市化对耕地存在积极的间接影响.人口城市化过程对耕地变动的复合影响结果是积极的还是消极的,将取决于一是城市化发展状态,即与工业化发展是否同步;二是村镇合并集中是否及时到位.为此,文章对中日人口城市化对耕地影响机制进行了比较. 相似文献
653.
原华荣 《中国人口.资源与环境》1993,3(1):30-34
生存空间可分为狭义和广义两种,狭义生存空间的特点是有限性和潜在性,扩展性或相对性则是广义生存空间的最大特征;对生存空间的分类研究,有助于某一国家或地区生存现状和发展潜力的评价;人们通过贸易,交换着各自的生存空间;发展经济和科学技术,合理分配生活和生产空间,保护环境,控制人口,以及对资源的合理分配,是人类保护和扩大生存空间努力的基本方面。 相似文献
654.
S. V. Zagrebel'nyi 《Russian Journal of Ecology》2004,35(6):395-402
Animal censuses and assessment of mortality in the sea otter subpopulation of Bering Island (the Commander Islands) have shown that indices of seasonal mortality may be used as a criterion for estimating well-being of this animal group. In 1999, the subpopulation of Bering Island entered a phase of stabilization of its spatial, age, and sex structure, with the stabilization process proper taking approximately three years after a peak of mortality. Mortality in the course of this process proved to be relatively high in age groups older than eight years but insignificant among middle-aged reproductive animals. As the age and sex structure of the insular group varies during the year and in different coastal areas, the data obtained by collecting dead animals cannot be used for estimating the structure of the whole population. 相似文献
655.
何仁仲 《中国人口.资源与环境》1992,(4)
本文在分析喀斯特的分布与该类地区人口、生态、环境与社会经济发展特征的基础上,总结了贵州省人民长期治理喀斯特的经验与成就,提出了“人口.粮食.生态”整体战略,运用生态农业原理,因地制宜,全面规划,综合开发、利用和保护,实现社会经济与生态环境协调发展。 相似文献
656.
657.
658.
试论人口—资源—环境与经济的协调发展 总被引:2,自引:0,他引:2
邱天朝 《中国人口.资源与环境》1993,3(4):19-23
人口、资源、环境与经济之间是相互制约又相互依存的动态关系,四者的协调发展包括“有限协调发展”和“完全协调发展”两个层次,其实质是弱化、消除其间的消极关系和消极影响,同时充分利用和促进其间的积极关系,实现四者之间的良性循环。我国作为一个发展中的人口大国,“协调发展战略”应以不影响长远的持续发展为前提,把经济发展置于中心位置,强调在发展经济的过程中要同时解决人口、资源与环境问题。 相似文献
659.
80年代中国宁夏的“吊庄”:农村区域开发和协调人地关系的新模式 总被引:2,自引:0,他引:2
汪一鸣 《中国人口.资源与环境》1993,3(4):36-41
宁夏回族自治区南部以人口超载导致的贫困和水土流失严重著称于世。针对区域开发的这些限制性因素,选择以协调人地关系为指导思想的“吊庄”模式,取得了良好的综合效益。本文主要论述了吊庄移民规划的方针、原则、理论依据、效益和成功经验。 相似文献
660.
Stuart Batterman 《Environmental management》1992,16(1):133-141
This article addresses the use of critical loads in optimized emission abatement strategies. Critical loads represent the
maximum tolerable deposition possible without adverse impacts, a limit that is highly spatially variable. As deposition targets,
critical loads cannot be satisfied at all receptors in Europe. Consequently, there is a need for alternative criteria that
still relate to ecological indicators, yet that are feasible, consistent, and equitable. Two criteria are suggested: the relative
critical load coverage and the relative deposition reduction. Deposition goals based on these criteria will guarantee that
a specified fraction of ecosystems will attain target loads and thus will be protected from adverse environmental impacts.
In areas that cannot achieve target loads with the best available control measures, deposition can be reduced to a specified
fraction of the unabated level.
Examples are presented that demonstrate their derivation and application of the two criteria. The criteria have been implemented
in the European-scale Regional Acidification Information and Simulation (RAINS) model. Results obtained indicate that optimized
emission strategies based on critical loads may be similar to emission strategies based on deposition reductions at certain
levels of the two criteria. This suggests that it may not be necessary to utilize critical loads to formulate deposition targets.
A second example shows the effect of excluding countries from European cost minimization. A country's participation can save
costs with moderate deposition targets; however, significant costs can be imposed with low (stringent) deposition targets.
These preliminary results have significant implications for multilateral negotiations. 相似文献