全文获取类型
收费全文 | 150篇 |
免费 | 1篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 3篇 |
环保管理 | 9篇 |
综合类 | 31篇 |
基础理论 | 48篇 |
环境理论 | 2篇 |
污染及防治 | 41篇 |
评价与监测 | 6篇 |
社会与环境 | 7篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 8篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 6篇 |
2012年 | 8篇 |
2011年 | 2篇 |
2010年 | 5篇 |
2009年 | 6篇 |
2008年 | 11篇 |
2007年 | 8篇 |
2006年 | 11篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1991年 | 3篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1964年 | 3篇 |
1956年 | 1篇 |
1953年 | 1篇 |
排序方式: 共有151条查询结果,搜索用时 15 毫秒
41.
42.
Peter Roessingh Katja H. Hora S. Ying Fung Anja Peltenburg Steph B. J. Menken 《Chemoecology》2000,10(1):41-47
Summary. The sugar alcohol dulcitol is a strong feeding stimulant for larvae of the small ermine moth Yponomeuta cagnagellus. In this paper we tested the hypothesis that dulcitol also acts as an oviposition stimulant for this species. We found that
the sugar-alcohol dulcitol was present on the surface of the host Euonymus europaeus. We also showed that (as yet unidentified compounds) can be systemically transferred (i.e. by uptake and transport via the
vascular system) from E. europaeus, to the non-host Crataegus monogyna and stimulate oviposition. However, no evidence was found that this stimulatory activity was due to dulcitol. Systemic enrichment
of C. monogyna with dulcitol did not induce oviposition on this plant. Neither was the application of pure dulcitol on artificial twigs
effective. In addition it was shown that when dulcitol was removed from host plant extracts, oviposition stimulatory activity
was retained in the fraction without dulcitol. Synergism between dulcitol and other stimulants could not be demonstrated,
however, high concentrations of dulcitol in combination with the main stimulant(s) showed a trend towards enhanced oviposition.
It is concluded that the sugar alcohol dulcitol can only play a limited role in adult host acceptance behaviour. The hypothesis
that a host shift in the genus Yponomeuta from Celastraceae to Rosaceae might have been facilitated by the presence of small amounts of dulcitol in Rosaceae therefore
needs to be restricted to larval feeding behaviour.
Received 20 August 1999; accepted 6 December 1999 相似文献
43.
Baumann Matthias Israel Christoph Piquer-Rodríguez María Gavier-Pizarro Gregorio Volante José Norberto Kuemmerle Tobias 《Regional Environmental Change》2017,17(4):1179-1191
Regional Environmental Change - The dry forests of Latin America are among the most dynamic deforestation frontiers in the world and are important carbon and biodiversity reservoirs. Our knowledge... 相似文献
44.
Viruses from contaminant sources can be transported through porous media to drinking water wells. The objective of this study was to investigate inactivation and sorption of viruses during saturated and unsaturated transport in different soils. Bacteriophages phiX174 and MS-2, and Br- tracer in a phosphate-buffered saline solution were introduced into saturated and unsaturated soil columns as a step function under constant flow rate and hydraulic conditions. Results showed that significantly greater virus removal occurred in the unsaturated columns than in the saturated columns in the two soils containing high metal oxides content. However, the increase in virus retention under unsaturated conditions was not significant in two other soils having high phosphorus and calcium contents and high pH, and in another soil with high organic matter content. The results imply that the extent of water content effect on inactivation and sorption of viruses can range from significant to minimal depending on the properties of the transport medium. We found that the presence of in situ metal oxides was a significant factor responsible for virus sorption and inactivation. Therefore, soils with high metal oxides content may have the potential to be used as hydrological barriers in preventing microbial contamination in the subsurface environments. We also found that the water content effect on virus removal and inactivation strongly depended on solid properties of the testing medium. 相似文献
45.
James Stephen Robinson Karen Baumann Yongfeng Hu Philipp Hagemann Lutz Kebelmann Peter Leinweber 《Ambio》2018,47(1):73-82
Strategies are needed to increase the sustainability of phosphorus (P) fertiliser management in agriculture. This paper reports on the potential of pyrolysis treatment to recycle P from renewable materials previously regarded as wastes. The study used K-edge X-ray absorption near-edge structure (XANES) spectroscopy to examine chemical forms of P in the waste feedstock materials and corresponding biochars (pyrolysis at 480–500 °C) of four ligno-cellulosic, plant-based residues and five relatively P-rich livestock and water-treatment by-products, to acquire information on changes in potential P fertiliser value. Pyrolysis enriched P in the biochars by factors of 1.3–4.3, thus offering wide-ranging P fertiliser potential. XANES spectroscopy revealed hydroxyapatite (HAP) as one of the dominant chemical P compounds in the feedstocks, ranging from 14% (rice husks) to 98% (animal bone) of total P. For most materials, pyrolysis increased the proportion of HAP, and pyrophosphates were generated in several cases. These alterations possibly lead to diversity in the P solubility characteristics of the biochars if used as soil amendments; this is an important property of environmentally sound P fertilisers. 相似文献
46.
Katja Kangas Anne Tolvanen Tarja Kälkäjä Pirkko Siikamäki 《Environmental management》2009,44(3):408-419
Outdoor recreation and nature-based tourism represent an increasingly intensive form of land use that has considerable impacts
on native ecosystems. The aim of this paper is to investigate how revegetation and management of ski runs influence soil nutrients,
vegetation characteristics, and the possible invasion of nonnative plant species used in revegetation into native ecosystems.
A soil and vegetation survey at ski runs and nearby forests, and a factorial experiment simulating ski run construction and
management (factors: soil removal, fertilization, and seed sowing) were conducted at Ruka ski resort, in northern Finland,
during 2003–2008. According to the survey, management practices had caused considerable changes in the vegetation structure
and increased soil nutrient concentrations, pH, and conductivity on the ski runs relative to nearby forests. Seed mixture
species sown during the revegetation of ski runs had not spread to adjacent forests. The experimental study showed that the
germination of seed mixture species was favored by treatments simulating the management of ski runs, but none of them could
eventually establish in the study forest. As nutrient leaching causes both environmental deterioration and changes in vegetation
structure, it may eventually pose a greater environmental risk than the spread of seed mixture species alone. Machine grading
and fertilization, which have the most drastic effects on soils and vegetation, should, therefore, be minimized when constructing
and managing ski runs. 相似文献
47.
48.
Managing Watershed Externalities in India: Theory and Practice 总被引:2,自引:0,他引:2
John Kerr Grant Milne Vasudha Chhotray Pari Baumann A.J. James 《Environment, Development and Sustainability》2007,9(3):263-281
Watershed development is the focus of poverty alleviation programs in rural India. Watershed projects aim to solve problems
of externalities, but they also create their own externalities, which cause uneven distribution of costs and benefits that
undermine project objectives and harm the poor. Numerous approaches exist to internalize externalities, including awareness
creation, moral suasion, investment subsidies, regulatory limits and fines, indirect benefits, mergers, and recent innovations
like payment for environmental services and cap and trade. These can be judged on several criteria; the best approach would
solve the problem cost effectively and help or at least not hurt poor people. Watershed projects in India were examined to
identify the approaches taken to internalize watershed externalities. Investment subsidies and indirect employment benefits
are the least effective approaches theoretically, but they are the most commonly applied, most likely because they are easy
to administer and bring popular short term gains. Some theoretically favorable approaches that have been used elsewhere, such
as payment for environmental services, may not work as well in India due to high transaction costs. However, one key innovation
that easily could be applied in India is to make investment subsidies contingent on performance. Legal support and property
rights reform would be needed for other favorable approaches. 相似文献
49.
Andreas Albrecht Katja Kiel Annette Kolk 《International journal of occupational safety and ergonomics》2007,13(2):201-213
In 2004/2005, a European Twinning Project was carried out to support Polish occupational safety and health institutions in putting into practice Directive 2000/54/EC regarding the protection of workers from risks related to exposure to biological agents at work. Information on and training in sampling and analysing biological agents of people responsible for bioaerosol measurements and the assessment of measuring results from the workplace atmosphere were part of the project. This paper is an extract of the authors' activities within the project and can be used as a tool for comparable activities in future projects with other European Union candidates. It gives information on working standards for bioaerosol measurements worked out and commonly used in Germany within the frame of European guidelines for bioaerosol measurements in the workplace atmosphere. Additionally it summarizes the authors' long practical experience in carrying out bioaerosol measurements in the atmosphere of various workplaces. 相似文献
50.