全文获取类型
收费全文 | 5496篇 |
免费 | 45篇 |
国内免费 | 25篇 |
专业分类
安全科学 | 114篇 |
废物处理 | 257篇 |
环保管理 | 380篇 |
综合类 | 942篇 |
基础理论 | 1352篇 |
环境理论 | 5篇 |
污染及防治 | 1773篇 |
评价与监测 | 423篇 |
社会与环境 | 302篇 |
灾害及防治 | 18篇 |
出版年
2023年 | 57篇 |
2022年 | 132篇 |
2021年 | 150篇 |
2020年 | 75篇 |
2019年 | 83篇 |
2018年 | 195篇 |
2017年 | 214篇 |
2016年 | 279篇 |
2015年 | 193篇 |
2014年 | 284篇 |
2013年 | 425篇 |
2012年 | 311篇 |
2011年 | 351篇 |
2010年 | 241篇 |
2009年 | 194篇 |
2008年 | 332篇 |
2007年 | 297篇 |
2006年 | 250篇 |
2005年 | 197篇 |
2004年 | 181篇 |
2003年 | 153篇 |
2002年 | 130篇 |
2001年 | 80篇 |
2000年 | 44篇 |
1999年 | 53篇 |
1998年 | 27篇 |
1997年 | 25篇 |
1996年 | 24篇 |
1995年 | 32篇 |
1994年 | 30篇 |
1993年 | 12篇 |
1992年 | 21篇 |
1991年 | 23篇 |
1990年 | 20篇 |
1989年 | 16篇 |
1988年 | 16篇 |
1987年 | 10篇 |
1986年 | 25篇 |
1985年 | 14篇 |
1984年 | 12篇 |
1983年 | 14篇 |
1982年 | 19篇 |
1980年 | 13篇 |
1966年 | 16篇 |
1965年 | 11篇 |
1964年 | 10篇 |
1959年 | 11篇 |
1957年 | 14篇 |
1956年 | 12篇 |
1954年 | 10篇 |
排序方式: 共有5566条查询结果,搜索用时 10 毫秒
571.
Edouard Lavergne Isabelle Calvès Anne Leila Meistertzheim Grégory Charrier Uwe Zajonz Jean Laroche 《Marine Biology》2014,161(5):1113-1126
Temporarily open/closed estuaries (TOCEs) are major ecosystems of the Indian Ocean coastal zones. Their functioning is tightly linked to climatic events such as monsoons and storms, and their mouth can close up for prolonged and variable periods of time, thus limiting their connectivity with the marine environment. Two types of genetic markers (i.e., mitochondrial cytochrome c oxidase I (COI) gene and microsatellites) were used to assess the genetic structure of 288 individuals of Terapon jarbua, a widely distributed fish species in the wider Gulf of Aden. Firstly, the hypothesis of panmixia was tested. Then, alternative hypotheses were investigated to explain the population genetic structure of T. jarbua: could it be shaped by (1) regional biogeographic barriers (i.e., Socotra Island vs. mainland Yemen) and/or (2) the particular functioning of TOCEs in relation to the species life cycle and particular physical ocean parameters? On one hand, the polymorphism of the COI inferred (1) a high haplotype diversity and a reduced nucleotide diversity over the whole data set and (2) a “star-like” shape of the haplotype network, thus suggesting a population expansion after local extinctions during the Pleistocene glaciations. On a second hand, the genotyping of eight microsatellites showed a significant genetic differentiation between T. jarbua populations in the wider Gulf of Aden (F ST = 0.035, p < 0.01), and thus, the panmixia hypothesis was rejected. Analyses of molecular variance results did not show any significant structure between Socotra Island and mainland Yemen and thus did not support the role of biogeographic barriers in structuring T. jarbua populations. Significant multi-locus deficits in heterozygotes at particular locations displaying high levels of F IS were recorded. It was suggested that a possible Wahlund effect took place in those TOCEs which could gather several cohorts of larvae stemming from different marine subpopulations over the sampled area. The present study emphasized the uniqueness of each TOCE as a potential reservoir of biodiversity and the urgent need for a better conservation program of those estuaries in the region, in order to avoid habitat fragmentation and permanent closure of those nursery areas by human activities. 相似文献
572.
573.
574.
J. Besseau-Ayasse C. Violle-Poirsier A. Bazin N. Gruchy A. Moncla F. Girard M. Till F. Mugneret A. Coussement F. Pelluard M. Jimenez P. Vago M. F. Portnoï C. Dupont C. Beneteau F. Amblard M. Valduga J. L. Bresson F. Carré-Pigeon N. Le Meur S. Tapia C. Yardin A. Receveur J. Lespinasse E. Pipiras M. P. Beaujard P. Teboul S. Brisset M. Catty E. Nowak N. Douet Guilbert H. Lallaoui S. Bouquillon V. Gatinois G. Joly-Helas F. Prieur F. Cartault D. Martin P. Kleinfinger D. Molina Gomes M. Doco-Fenzy F. Vialard 《黑龙江环境通报》2014,34(5):424-430
575.
576.
577.
Marco Pandolfi Yolanda Gonzalez-Castanedo Andrés Alastuey Jesus D. de la Rosa Enrique Mantilla A. Sanchez de la Campa Xavier Querol Jorge Pey Fulvio Amato Teresa Moreno 《Environmental science and pollution research international》2011,18(2):260-269
Background
The impact of shipping emissions on urban agglomerations close to major ports and vessel routes is probably one of the lesser understood aspects of anthropogenic air pollution. Little research has been done providing a satisfactory comprehension of the relationship between primary pollutant emissions, secondary aerosols formation and resulting air quality. 相似文献578.
579.