全文获取类型
收费全文 | 25359篇 |
免费 | 496篇 |
国内免费 | 2244篇 |
专业分类
安全科学 | 910篇 |
废物处理 | 1293篇 |
环保管理 | 2786篇 |
综合类 | 5685篇 |
基础理论 | 6154篇 |
环境理论 | 6篇 |
污染及防治 | 7380篇 |
评价与监测 | 1880篇 |
社会与环境 | 1628篇 |
灾害及防治 | 377篇 |
出版年
2023年 | 184篇 |
2022年 | 462篇 |
2021年 | 458篇 |
2020年 | 331篇 |
2019年 | 347篇 |
2018年 | 526篇 |
2017年 | 565篇 |
2016年 | 752篇 |
2015年 | 668篇 |
2014年 | 979篇 |
2013年 | 2299篇 |
2012年 | 1105篇 |
2011年 | 1284篇 |
2010年 | 1166篇 |
2009年 | 1131篇 |
2008年 | 1224篇 |
2007年 | 1265篇 |
2006年 | 1139篇 |
2005年 | 903篇 |
2004年 | 861篇 |
2003年 | 883篇 |
2002年 | 847篇 |
2001年 | 1061篇 |
2000年 | 773篇 |
1999年 | 540篇 |
1998年 | 427篇 |
1997年 | 362篇 |
1996年 | 404篇 |
1995年 | 391篇 |
1994年 | 354篇 |
1993年 | 303篇 |
1992年 | 305篇 |
1991年 | 254篇 |
1990年 | 255篇 |
1989年 | 243篇 |
1988年 | 209篇 |
1987年 | 168篇 |
1986年 | 139篇 |
1985年 | 145篇 |
1984年 | 171篇 |
1983年 | 158篇 |
1982年 | 196篇 |
1981年 | 134篇 |
1980年 | 119篇 |
1979年 | 152篇 |
1978年 | 118篇 |
1977年 | 107篇 |
1976年 | 100篇 |
1975年 | 83篇 |
1974年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
Li Yufeng Wu Yuqin Wright Alan Xu Jiayi Liu Hongyu Wang Gang Wang Cheng 《Environmental science and pollution research international》2020,27(31):38861-38870
Environmental Science and Pollution Research - Small geographically isolated ponds provide a multitude of ecological functions and services, but water table fluctuations alter the magnitude of... 相似文献
962.
Abdel-Daim Mohamed M. Abo El-Ela Fatma I. Alshahrani Fatima K. Bin-Jumah May Al-Zharani Mohammed Almutairi Bader Alyousif Mohamed S. Bungau Simona Aleya Lotfi Alkahtani Saad 《Environmental science and pollution research international》2020,27(30):37709-37717
Environmental Science and Pollution Research - Acrylamide (AA), an industrial monomer, may cause multi-organ toxicity through induction of oxidative stress and inflammation. The antioxidant... 相似文献
963.
964.
以子牙河、滏阳河和永定河流经的农村周边水环境为研究区,应用迭代目标转换因子紫外分光光度分析法检测水环境中四环类、氯霉素类和硫酸链霉素含量,并分析其分布特征及可能的影响因素和来源。结果表明,研究区3类抗生素均有检出,四环类、氯霉素类和硫酸链霉素最高检出值分别为9.26 μg/L、1.98 μg/L和1.29 μg/L,四环类抗生素污染较严重。研究区抗生素分布特征与区域内社会活动、畜牧业养殖发展、化工企业分布存在一定联系,生活污水、养殖废水和制药化工企业废水排放是3类抗生素污染的主要来源。 相似文献
965.
Landslides are a natural hazard that presents a major threat to human life and infrastructure. Although they are a very common phenomenon in Colombia, there is a lack of analysis that entails national and comprehensive spatial, temporal, and socioeconomic evaluations of such events based on historical records. This study provides a detailed assessment of the spatial and temporal patterns and the socioeconomic impacts associated with landslides that occurred in the country between 1900 and 2018. Two national landslide databases were consulted and this information was complemented by local and regional landslide catalogues. A total of 30,730 landslides were recorded in the 118-year period. Rainfall is the most common trigger of landslides, responsible for 92 per cent of those registered, but most fatalities (68 per cent) are due to landslides caused by volcanic activity and earthquakes. An ‘fN curve’ revealed a very high frequency of small and moderate fatal landslides in the time frame. 相似文献
966.
Russian Journal of Ecology - Analysis of hunting samples of the Kamchatka sable population for 2001–2013 has revealed changes in the reproductive parameters of females over the period from... 相似文献
967.
Russian Journal of Ecology - Technogenic pollution can accelerate microevolutionary processes in natural populations. We estimated the nuclear DNA content of 10 Bromus inermis Leyss. samples from... 相似文献
968.
969.
The present experiment was done to evaluate the impact of ambient air pollution on carrot (Dacus carotavar. Pusa Kesar) plants using open top chambers (OTCs) ventilated with ambient (NFCs) or charcoal filtered air (FCs) at a suburban site of Varanasi, India. Various morphological, physiological and biochemical characteristics of the plants were studied at different growth stages. Air monitoring data clearly showed high concentrations of SO2, NO2and O3in the ambient air of study site. SO2and NO2concentrations were higher during early growth stages of carrot, whereas O3concentration was highest during later growth stages. Filtration of air has caused significant reductions in all the three pollutant concentrations in FCs as compared to NFCs.Plants growing in FCs showed significantly higher photosynthetic rate, stomatal conductance, water use efficiency and variable fluorescence as compared to plants growing in NFCs. Protein content also showed a similar pattern, however, lipid peroxidation, ascorbic acid content and peroxidase activity were higher in plants growing in NFCs as compared to FCs. Shoot length, number of leaves per plant, leaf area and root and shoot weight increased significantly upon filtration of ambient air. Total nitrogen decreased significantly in root, but increased significantly in shoot of plants grown in NFCs. Total P, Mg, Ca and K contents decreased significantly in plants grown in NFCs as compared to FCs. The individual pollutant concentrations were below threshold for plant injury, but the combined effect of all the three seems to act synergistically in causing greater adverse impact on dry weight and physiology of carrot plants. The study clearly indicates that air pollutants are high enough in the ambient air to cause significant unfavorable impact on carrot plants. The work further supports the usefulness of OTCs for assessing air pollution damage under field conditions in developing countries. 相似文献
970.
Dust storms frequently occur in Mongolia and in northern China. Each year there are 30 to 120 dusty days in source regions of Mongolia and 14–20 dusty days on the Korean Peninsula. Intense sand storms and associated dust falls produce environmental impacts in East Asia. This paper discusses the environmental degradation in Mongolia and the social, economic and atmospheric impacts of dust storms in the sink area. The impact of dust storms on environmental compartments as well as their direct and indirect consequences to basic resources like water and energy demand and supply is explained. Governments are encouraged to take appropriate action in specified regions. For monitoring dust storms there is a need for international cooperation to combat growing environmental and human security concerns. 相似文献