全文获取类型
收费全文 | 24742篇 |
免费 | 206篇 |
国内免费 | 136篇 |
专业分类
安全科学 | 497篇 |
废物处理 | 1190篇 |
环保管理 | 3732篇 |
综合类 | 4383篇 |
基础理论 | 6599篇 |
环境理论 | 8篇 |
污染及防治 | 5567篇 |
评价与监测 | 1701篇 |
社会与环境 | 1323篇 |
灾害及防治 | 84篇 |
出版年
2018年 | 1603篇 |
2017年 | 1508篇 |
2016年 | 1428篇 |
2015年 | 330篇 |
2014年 | 275篇 |
2013年 | 1235篇 |
2012年 | 834篇 |
2011年 | 1829篇 |
2010年 | 1077篇 |
2009年 | 1062篇 |
2008年 | 1389篇 |
2007年 | 1762篇 |
2006年 | 552篇 |
2005年 | 409篇 |
2004年 | 462篇 |
2003年 | 527篇 |
2002年 | 488篇 |
2001年 | 531篇 |
2000年 | 366篇 |
1999年 | 255篇 |
1998年 | 196篇 |
1997年 | 178篇 |
1996年 | 216篇 |
1995年 | 224篇 |
1994年 | 233篇 |
1993年 | 215篇 |
1992年 | 203篇 |
1991年 | 205篇 |
1990年 | 237篇 |
1989年 | 214篇 |
1988年 | 191篇 |
1987年 | 181篇 |
1986年 | 174篇 |
1985年 | 180篇 |
1984年 | 193篇 |
1983年 | 195篇 |
1982年 | 185篇 |
1981年 | 186篇 |
1980年 | 165篇 |
1979年 | 161篇 |
1978年 | 150篇 |
1977年 | 137篇 |
1976年 | 145篇 |
1975年 | 118篇 |
1974年 | 149篇 |
1973年 | 130篇 |
1972年 | 132篇 |
1971年 | 110篇 |
1970年 | 109篇 |
1967年 | 117篇 |
排序方式: 共有10000条查询结果,搜索用时 593 毫秒
601.
Loss of zooxanthellae (dinoflagellate Symbiodinium) from corals will sometimes lead to mass mortality of corals. To detect and quantify Symbiodinium released from corals, we developed a zooxanthellae “trap” and a quantitative PCR (qPCR) system with Symbiodinium clades A–F-specific primer sets. The trap was attached to a branch or the surface of several wild stony corals, and the water
samples within the traps, including released Symbiodinium, were subjected to qPCR. All tested corals released clade C Symbiodinium at estimates of ~5,900 cells h−1 cm−2 of coral surface. Although all tested Pocillopora eydouxi harboured both clades C and D, some of these colonies released only clade C or released a lesser amount of clade D than that
in the tissues. Our Symbiodinium quantification system revealed that wild hermatypic corals constantly release Symbiodinium to the environment. Our result suggests that some corals may discharge certain clades of Symbiodinium alternatively. 相似文献
602.
603.
604.
Roser Rotchs-Ribalta Sara Ruas Karzan D. Ahmed Michael Gormally James Moran Jane Stout Blnaid White Daire
hUallachin 《Ambio》2021,50(2):346
Concerns over the loss of biodiversity and ecosystem services in farmland have prompted the development of agri-environment policy measures aimed at reducing farming pressure and maintaining semi-natural habitats in farmed landscapes. However, further knowledge is needed to guarantee successful agri-environment measures implementation. The current study assessed the quantity and the quality of semi-natural habitats in farms across a gradient of farming intensities in two contrasting regions in Ireland. Policy protection seemed fundamental for semi-natural habitats preservation. Habitats not protected by agricultural policy relied on extensive farming and are in danger of disappearing if they are intensified or abandoned. Due to the lack of policy incentives for habitat quality, no correlations were found between farming intensity and share of semi-natural habitats with habitat quality. Therefore, extensive farming and retention of habitats alone may not reverse the decline of farmland quality and biodiverisity and, thus, measures incentivising the environmental quality may be more successful.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01344-6) contains supplementary material, which is available to authorized users. 相似文献
605.
Cadano James Ryand Jose Mariel Lubi Aloysius Gerard Maling Joel Nathaniel Moraga Josiah Samuel Shi Quinn Yale Vegafria Hannah Mae VinceCruz-Abeledo Chona Camille 《Environmental science and pollution research international》2021,28(10):11954-11961
Environmental Science and Pollution Research - Bio-waste materials from aquatic species are alternative sources of chitin and chitosan—high-value natural biodegradable and biocompatible... 相似文献
606.
607.
An Hui Razzaq Asif Haseeb Muhammad Mihardjo Leonardus W. W. 《Environmental science and pollution research international》2021,28(5):5254-5270
Environmental Science and Pollution Research - The Belt and Road Initiative (BRI) is closely linked to the ecological sustainability of the infrastructure ventures that intrinsically include the... 相似文献
608.
Mlynek Franz Himmelsbach Markus Buchberger Wolfgang Klampfl Christian W. 《Environmental science and pollution research international》2021,28(42):59382-59390
Environmental Science and Pollution Research - The aim of this study was to investigate the uptake of four beta-blockers by the model plant Lepidium sativum (garden cress) and their possible... 相似文献
609.
Jesus D. Fernandez-Bayo Juliano Toniato Blake A. Simmons Christopher W. Simmons 《环境科学学报(英文版)》2017,29(6):164-168
Food processing facilities often use antimicrobial quaternary ammonium compound (QAC) sanitizers to maintain cleanliness. These QACs can end up in wastewaters used as feedstock for anaerobic digestion. The aim of this study was to measure the effect of QAC contamination on biogas production and structure of microbial communities in thermophilic digester sludge. Methane production and biogas quality data were analyzed in batch anaerobic digesters containing QAC at 0, 15, 50, 100 and 150 mg/L. Increasing sanitizer concentration in the bioreactors negatively impacted methane production rate and biogas quality. Microbial community composition data was obtained through 16S rRNA gene sequencing from the QAC-contaminated sludges. Sequencing data showed no significant restructuring of the bacterial communities. However, significant restructuring was observed within the archaeal communities as QAC concentration increased. Further studies to confirm these effects on a larger scale and with a longer retention time are necessary. 相似文献
610.
Ruyuan Jiao Rolando Fabris Christopher W.K. Chow Mary Drikas John van Leeuwen Dongsheng Wang Zhizhen Xu 《环境科学学报(英文版)》2017,29(7):238-245
Minimizing particles in water is a key goal for improving drinking water quality and safety.The media filtration process,as the last step of the solid–liquid separation process,is largely influenced by the characteristics of flocs,which are formed and controlled within the coagulation process.In a laboratory-based study,the impacts of the physical characteristics of flocs formed using aluminum sulfate on the filtration treatment of two comparative water samples were investigated using a photometric dispersion analyzer and a filterability apparatus.In general,the optimum dosage for maximizing filterability was higher than that for minimizing turbidity under neutral p H conditions.For a monomeric aluminum-based coagulant,the charge neutralization mechanism produced better floc characteristics,including floc growth speed and size,than the sweep flocculation mechanism.In addition,the charge neutralization mechanism showed better performance compared to sweep flocculation in terms of DOC removal and floc filterability improvement for both waters,and showed superiority in turbidity removal only when the raw water had high turbidity.For the different mechanisms,the ways that floc characteristics impacted on floc filterability also differed.The low variation in floc size distribution obtained under the charge neutralization mechanism resulted in the flocs being amenable to removal by filtration processes.For the sweep flocculation mechanism,increasing the floc size improved the settling ability of flocs,resulting in higher filter efficiency. 相似文献