全文获取类型
收费全文 | 2729篇 |
免费 | 76篇 |
国内免费 | 24篇 |
专业分类
安全科学 | 187篇 |
废物处理 | 158篇 |
环保管理 | 556篇 |
综合类 | 353篇 |
基础理论 | 615篇 |
环境理论 | 4篇 |
污染及防治 | 636篇 |
评价与监测 | 191篇 |
社会与环境 | 93篇 |
灾害及防治 | 36篇 |
出版年
2023年 | 14篇 |
2022年 | 20篇 |
2021年 | 30篇 |
2020年 | 26篇 |
2019年 | 27篇 |
2018年 | 63篇 |
2017年 | 60篇 |
2016年 | 81篇 |
2015年 | 76篇 |
2014年 | 73篇 |
2013年 | 239篇 |
2012年 | 116篇 |
2011年 | 157篇 |
2010年 | 120篇 |
2009年 | 137篇 |
2008年 | 133篇 |
2007年 | 150篇 |
2006年 | 139篇 |
2005年 | 106篇 |
2004年 | 89篇 |
2003年 | 108篇 |
2002年 | 80篇 |
2001年 | 57篇 |
2000年 | 58篇 |
1999年 | 45篇 |
1998年 | 39篇 |
1997年 | 37篇 |
1996年 | 36篇 |
1995年 | 33篇 |
1994年 | 39篇 |
1993年 | 33篇 |
1992年 | 22篇 |
1991年 | 26篇 |
1990年 | 15篇 |
1989年 | 13篇 |
1988年 | 17篇 |
1987年 | 19篇 |
1986年 | 15篇 |
1985年 | 21篇 |
1984年 | 12篇 |
1983年 | 20篇 |
1982年 | 19篇 |
1981年 | 26篇 |
1980年 | 14篇 |
1979年 | 13篇 |
1977年 | 12篇 |
1964年 | 7篇 |
1958年 | 6篇 |
1957年 | 6篇 |
1955年 | 8篇 |
排序方式: 共有2829条查询结果,搜索用时 31 毫秒
661.
662.
Kamran Moradkhani Laurence Cuisset Pierre Boisseau Olivier Pichon Marine Lebrun Houda Hamdi-Rozé Marie-Laure Maurin Nicolas Gruchy Marie-Christine Manca-Pellissier Perrine Malzac Frédéric Bilan Marie-Pierre Audrezet Pascale Saugier-Veber Anne-Laure Fauret-Amsellem Chantal Missirian Paul Kuentz Gregory Egea Agnès Guichet Isabelle Creveaux Caroline Janel Ines Harzallah Renaud Touraine Carole Goumy Nicole Joyé Jacques Puechberty Emmanuelle Haquet Sandra Chantot-Bastaraud Sébastien Schmitt Philippe Gosset Bénédicte Duban-Bedu Bruno Delobel Philippe Vago François Vialard Denise Molina Gomes Jean-Pierre Siffroi Jean-Paul Bonnefont Jean-Michel Dupont Philippe Jonveaux Martine Doco-Fenzy Damien Sanlaville Cédric Le Caignec 《黑龙江环境通报》2019,39(11):986-992
663.
664.
665.
666.
Quantifying species recovery and conservation success to develop an IUCN Green List of Species
下载免费PDF全文
![点击此处可从《Conservation biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
H. Resit Akçakaya Elizabeth L. Bennett Thomas M. Brooks Molly K. Grace Anna Heath Simon Hedges Craig Hilton‐Taylor Michael Hoffmann David A. Keith Barney Long David P. Mallon Erik Meijaard E.J. Milner‐Gulland Ana S.L. Rodrigues Jon Paul Rodriguez P.J. Stephenson Simon N. Stuart Richard P. Young 《Conservation biology》2018,32(5):1128-1138
Stopping declines in biodiversity is critically important, but it is only a first step toward achieving more ambitious conservation goals. The absence of an objective and practical definition of species recovery that is applicable across taxonomic groups leads to inconsistent targets in recovery plans and frustrates reporting and maximization of conservation impact. We devised a framework for comprehensively assessing species recovery and conservation success. We propose a definition of a fully recovered species that emphasizes viability, ecological functionality, and representation; and use counterfactual approaches to quantify degree of recovery. This allowed us to calculate a set of 4 conservation metrics that demonstrate impacts of conservation efforts to date (conservation legacy); identify dependence of a species on conservation actions (conservation dependence); quantify expected gains resulting from conservation action in the medium term (conservation gain); and specify requirements to achieve maximum plausible recovery over the long term (recovery potential). These metrics can incentivize the establishment and achievement of ambitious conservation targets. We illustrate their use by applying the framework to a vertebrate, an invertebrate, and a woody and an herbaceous plant. Our approach is a preliminary framework for an International Union for Conservation of Nature (IUCN) Green List of Species, which was mandated by a resolution of IUCN members in 2012. Although there are several challenges in applying our proposed framework to a wide range of species, we believe its further development, implementation, and integration with the IUCN Red List of Threatened Species will help catalyze a positive and ambitious vision for conservation that will drive sustained conservation action. 相似文献
667.
Bird‐community responses to habitat creation in a long‐term,large‐scale natural experiment
下载免费PDF全文
![点击此处可从《Conservation biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Robin C. Whytock Elisa Fuentes‐Montemayor Kevin Watts Patanjaly Barbosa De Andrade Rory T. Whytock Paul French Kirsty J. Park 《Conservation biology》2018,32(2):345-354
Ecosystem function and resilience are compromised when habitats become fragmented due to land‐use change. This has led to national and international conservation strategies aimed at restoring habitat extent and improving functional connectivity (i.e., maintaining dispersal processes). However, biodiversity responses to landscape‐scale habitat creation and the relative importance of spatial and temporal scales are poorly understood, and there is disagreement over which conservation strategies should be prioritized. We used 160 years of historic post‐agricultural woodland creation as a natural experiment to evaluate biodiversity responses to habitat creation in a landscape context. Birds were surveyed in 101 secondary, broadleaf woodlands aged 10–160 years with ≥80% canopy cover and in landscapes with 0‐17% broadleaf woodland cover within 3000 m. We used piecewise structural equation modeling to examine the direct and indirect relationships between bird abundance and diversity, ecological continuity, patch characteristics, and landscape structure and quantified the relative conservation value of local and landscape scales for bird communities. Ecological continuity indirectly affected overall bird abundance and species richness through its effects on stand structure, but had a weaker influence (effect size near 0) on the abundance and diversity of species most closely associated with woodland habitats. This was probably because woodlands were rapidly colonized by woodland generalists in ≤10 years (minimum patch age) but were on average too young (median 50 years) to be colonized by woodland specialists. Local patch characteristics were relatively more important than landscape characteristics for bird communities. Based on our results, biodiversity responses to habitat creation depended on local‐ and landscape‐scale factors that interacted across time and space. We suggest that there is a need for further studies that focus on habitat creation in a landscape context and that knowledge gained from studies of habitat fragmentation and loss should be used to inform habitat creation with caution because the outcomes are not necessarily reciprocal. 相似文献
668.
Paul D. Bakke Robert Thomas Charles Parrett 《Journal of the American Water Resources Association》1999,35(4):911-921
ABSTRACT: A regional adjustment relationship was developed to estimate long-term (30-year) monthly median discharges from short term (three-year) records. This method differs from traditional approaches in that it is based on site-specific discharge data but does not require correlation of these data with discharges from a single hydrologically similar long-term gage. The method is shown to be statistically robust, and applicable to statistics other than the median. 相似文献
669.
Zhi C. Lin John M. Ondov W. Robert Kelly Paul J. Paulsen Robert K. Stevens 《Journal of the Air & Waste Management Association (1995)》2013,63(8):1057-1062
Stable isotopic tracers were used in Roanoke, Virginia, to tag particulate emissions from diesel trucks and residential oil furnaces, two sources of soot and PAHs which cannot be differentiated on the basis of known constituents. Approximately 1.6 g of enriched 149Sm were used to tag 264 m3 of diesel fuel burned by the city bus and truck fleets; 0.39 g of 150Sm were used to tag 106 m3 of residential heating oil. Picogram amounts of the tracers were determined simultaneously by thermal-ionization mass spectrometry in fine particles collected within the city at signal-to-noise ratios as large as 6000. These results demonstrate the feasibility of tracing particles from multiple combustion sources with stable, separated isotopes. 相似文献