全文获取类型
收费全文 | 2457篇 |
免费 | 33篇 |
国内免费 | 40篇 |
专业分类
安全科学 | 124篇 |
废物处理 | 155篇 |
环保管理 | 281篇 |
综合类 | 364篇 |
基础理论 | 435篇 |
环境理论 | 1篇 |
污染及防治 | 780篇 |
评价与监测 | 222篇 |
社会与环境 | 148篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 33篇 |
2022年 | 71篇 |
2021年 | 88篇 |
2020年 | 43篇 |
2019年 | 44篇 |
2018年 | 94篇 |
2017年 | 94篇 |
2016年 | 118篇 |
2015年 | 78篇 |
2014年 | 107篇 |
2013年 | 242篇 |
2012年 | 147篇 |
2011年 | 184篇 |
2010年 | 128篇 |
2009年 | 111篇 |
2008年 | 150篇 |
2007年 | 123篇 |
2006年 | 143篇 |
2005年 | 113篇 |
2004年 | 74篇 |
2003年 | 51篇 |
2002年 | 49篇 |
2001年 | 29篇 |
2000年 | 12篇 |
1999年 | 18篇 |
1998年 | 10篇 |
1997年 | 9篇 |
1996年 | 12篇 |
1995年 | 14篇 |
1994年 | 10篇 |
1993年 | 9篇 |
1992年 | 12篇 |
1991年 | 6篇 |
1990年 | 14篇 |
1989年 | 9篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1979年 | 4篇 |
1966年 | 4篇 |
1962年 | 2篇 |
1961年 | 2篇 |
1960年 | 3篇 |
1959年 | 2篇 |
1953年 | 2篇 |
1928年 | 2篇 |
排序方式: 共有2530条查询结果,搜索用时 343 毫秒
601.
602.
Ulrika Eriksson Anna Kärrman Anna Rotander Bjørg Mikkelsen Maria Dam 《Environmental science and pollution research international》2013,20(11):7940-7948
Diet and drinking water are suggested to be major exposure pathways for perfluoroalkyl substances (PFASs). In this study, food items and water from Faroe Islands sampled in 2011/2012 were analyzed for 11 perfluoroalkyl carboxylic acids (PFCAs) and 4 perfluoroalkane sulfonic acids (PFSAs). The food samples included milk, yoghurt, crème fraiche, potatoes, fish, and fish feed, and the water samples included surface water and purified drinking water. In total, nine PFCAs and four PFSAs were detected. Generally, the levels of PFAS were in the lower picogram per gram range. Perfluorobutanoic acid was a major contributor to the total PFASs concentration in water samples and had a mean concentration of 750 pg/L. Perfluoroundecanoic acid (PFUnDA) was predominating in milk and wild fish with mean concentrations of 170 pg/g. Perfluorooctane sulfonic acid (PFOS) was most frequently detected in food items followed by PFUnDA, perfluorononanoic acid, and perfluorooctanoic acid (PFOA). Levels of PFUnDA and PFOA exceeded those of PFOS in milk and fish samples. Prevalence of long-chain PFCAs in Faroese food items and water is confirming earlier observations of their increase in Arctic biota. Predominance of short-chain and long-chain homologues indicates exposure from PFOS and PFOA replacement compounds. 相似文献
603.
604.
Marianne Lefebvre Maria Espinosa Sergio Gomez y Paloma Maria Luisa Paracchini Annette Piorr Ingo Zasada 《Journal of Environmental Planning and Management》2015,58(12):2088-2112
During the last 50 years, the Common Agricultural Policy (CAP) has impacted the evolution of European agricultural landscapes by driving changes in land use and farming practices. We propose a typology characterising the scales relevant for agricultural landscapes management and argue that action is required on three scales: (1) a landscape oriented management at the farm level; (2) the coordination of land managers’ actions at the landscape level; and (3) the conservation of the diversity of agricultural landscapes in the EU. We provide evidence that until now the CAP has mainly focused on the first scale. We also illustrate how agricultural policy could encourage coordinated actions at the landscape- and EU-scales. In particular, we propose policy instruments to coordinate actions of individual land owners (e.g. collective bonus in agro-environmental contracts or support to environmental cooperatives (scale 2)). We also analyse how the recognition and transposition of the European Landscape Convention could promote trans-frontier landscape cooperation in order, not only to conserve high-quality rural landscapes, but also to ensure the conservation of the diversity of EU landscapes (scale 3). This paper provides a knowledge base to support an integrated CAP design in the direction of improved landscape management, as an important component of the EU project towards more sustainable agriculture. 相似文献
605.
Marta Horta de Sousa Vergílio Helena Maria Gregório Pina Calado 《Journal of Environmental Planning and Management》2015,58(6):1015-1033
The biophysical features of small islands (SI) distinguish them from other territories; isolation, small size and several anthropogenic pressures reduce the resilience of ecosystems and increase their vulnerability to global changes. Many SI have a shortage of infrastructures, institutions and technical/financial resources that hinder planning and require different integrated solutions. In Portugal, the National Ecological Reserve (NER) is legally binding for spatial planning instruments. It aims to defend natural values and areas of ecological value, or sensibility, or susceptible to natural hazards. However, the criteria for the design of NER are strictly set for mainland territory, not taking into account specific features of small islands. A case study of the Azores Archipelago is used to demonstrate that spatial planning instruments should be adapted to island contexts. Such adaptation will increase the effectiveness of their implementation in relation to the protection of natural resources, stability of biophysical structures and prevention of natural hazards. Observing the main differences between mainland and the Azores Archipelago it is possible to define a methodological transposition of the NER aims and goals into an island context. This approach is an answer to the constraints in effective adaptation of spatial planning instruments for islands. 相似文献
606.
Magalie Bassan Doulaye Koné Mbaye Mbéguéré Christof Holliger Linda Strande 《Journal of Environmental Planning and Management》2015,58(10):1690-1710
Many factors influence success and failure of large-scale faecal sludge and wastewater treatment projects in low-income countries. Benchmarking indicators and multicriteria analysis were adapted to define key institutional, technical and financial factors, to analyse their interrelations, and understand priorities to consider when planning and managing treatment plants. For the first time, these methods have been combined in a quantitative manner to assess planned and on-going treatment plant projects. This new methodology will aid sanitation utilities, private consultants, and funding institutions to prioritise activities and organise the operation of treatment plants. 相似文献
607.
Adaptive Targeting: Engaging Farmers to Improve Targeting and Adoption of Agricultural Conservation Practices 下载免费PDF全文
Margaret M. Kalcic Jane Frankenberger Indrajeet Chaubey Linda Prokopy Laura Bowling 《Journal of the American Water Resources Association》2015,51(4):973-991
Targeting of agricultural conservation practices to cost‐effective locations has long been of interest to watershed managers, yet its implementation cannot succeed without meaningful engagement of agricultural producers who are decision makers on the lands they farm. In this study, we engaged 14 west‐central Indiana producers and landowners in an adaptive targeting experiment. Interviews carried out prior to targeting provided rich spatial information on existing conservation practices as well as producers' preferences for future conservation projects. We targeted six of the most accepted conservation practices using the Soil and Water Assessment Tool and spatial optimization using a genetic algorithm approach. Fairly optimal conservation scenarios were possible with even the most limiting constraints of farmer‐accepted practices. We presented in follow‐up interviews a total of 176 conservation practice recommendations on 103 farm fields to 10 farmers whose lands were targeted for conservation. Primary findings indicated producers were interested in the project, were open to hearing recommendations about their lands, and expressed a high likelihood of adopting 35% of targeted recommendations. Farmers generally viewed the interview process and presentation of results quite favorably, and the interviews were found to build trust and make the targeting process more acceptable to them. 相似文献
608.
贵阳市环境空气质量预报预警系统建立的探讨 总被引:1,自引:0,他引:1
分析了贵阳市空气质量预报中污染物、地形及下垫面、植被等关键影响因素。提出了贵阳市环境空气质量预报预警系统的整体架构,分别对排放源监测与管理系统、环境空气质量预报系统和污染预警与控制决策支持系统等三个核心部分进行阐述,进一步提出了贵阳市大气污染防控措施及防控机制。 相似文献
609.
610.