全文获取类型
收费全文 | 227篇 |
免费 | 15篇 |
国内免费 | 20篇 |
专业分类
安全科学 | 8篇 |
废物处理 | 9篇 |
环保管理 | 59篇 |
综合类 | 35篇 |
基础理论 | 72篇 |
环境理论 | 1篇 |
污染及防治 | 44篇 |
评价与监测 | 12篇 |
社会与环境 | 19篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 7篇 |
2022年 | 10篇 |
2021年 | 11篇 |
2020年 | 2篇 |
2019年 | 7篇 |
2018年 | 13篇 |
2017年 | 17篇 |
2016年 | 18篇 |
2015年 | 18篇 |
2014年 | 11篇 |
2013年 | 19篇 |
2012年 | 17篇 |
2011年 | 15篇 |
2010年 | 15篇 |
2009年 | 7篇 |
2008年 | 16篇 |
2007年 | 19篇 |
2006年 | 11篇 |
2005年 | 3篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 6篇 |
2001年 | 4篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1984年 | 1篇 |
排序方式: 共有262条查询结果,搜索用时 46 毫秒
221.
222.
Understanding why people make the decisions they do remains a fundamental challenge facing conservation science. Ecosystem service (ES) (a benefit people derive from an ecosystem) approaches to conservation reflect efforts to anticipate people's preferences and influence their environmental behavior. Yet, the design of ES approaches seldom includes psychological theories of human behavior. We sought to alleviate this omission by applying a psychological theory of human values to a cross‐cultural ES assessment. We used interviews and focus groups with fish workers from 28 coral reef fishing communities in 4 countries to qualitatively identify the motivations (i.e., human values) underlying preferences for ES; quantitatively evaluate resource user ES priorities; and identify common patterns among ES motivations and ES priorities (i.e., trade‐offs and synergies). Three key findings are evident that align with human values theory. First, motivations underlying preferences for individual ESs reflected multiple human values within the same value domain (e.g., self‐enhancement). Second, when averaged at community or country scales, the order of ES priorities was consistent. However, the order belied significant variation that existed among individuals. Third, in line with human values theory, ESs related to one another in a consistent pattern; certain service pairs reflected trade‐off relationships (e.g., supporting and provisioning), whereas other service pairs reflected synergistic relationships (e.g., supporting and regulating). Together, these findings help improve understanding of when and why convergence and trade‐offs in people's preferences for ESs occur, and this knowledge can inform the development of suitable conservation actions. 相似文献
223.
Retraction: Olujobi, O.J., & Olusola-Olujobi, T. (2020). Comparative appraisals of legal and institutional framework governing gas flaring in Nigeria's upstream petroleum sector: How satisfactory?. Environmental Quality Management, https://doi.org/10.1002/tqem.21680 The above article from Environmental Quality Management published online on 3 July 2020 in Wiley Online Library ( wileyonlinelibrary.com ) in Early View has been retracted by agreement between the journal Editor in Chief, Jega Jegatheesan and Wiley Periodicals, LLC. The retraction has been agreed due to unattributed overlap with a previously published article from the same group of authors. 相似文献
224.
Dallel Arabet Sébastien Tempel Michel Fons Yann Denis Cécile Jourlin-Castelli Joshua Armitano David Redelberger Chantal Iobbi-Nivol Abderrahmane Boulahrouf Vincent Méjean 《Environmental science and pollution research international》2014,21(8):5619-5627
Sulfonylurea herbicides are widely used on a wide range of crops to control weeds. Chevalier® OnePass herbicide is a sulfonylurea herbicide intensively used on cereal crops in Algeria. No information is yet available about the biodegradation of this herbicide or about its effect on the bacterial community of the soil. In this study, we collected an untreated soil sample, and another sample was collected 1 month after treatment with the herbicide. Using a high-resolution melting DNA technique, we have shown that treatment with Chevalier® OnePass herbicide only slightly changed the composition of the whole bacterial community. Two hundred fifty-nine macroscopically different clones were isolated from the untreated and treated soil under both aerobic and microaerobic conditions. The strains were identified by sequencing a conserved fragment of the 16S rRNA gene. The phylogenetic trees constructed using the sequencing results confirmed that the bacterial populations were similar in the two soil samples. Species belonging to the Lysinibacillus, Bacillus, Pseudomonas, and Paenibacillus genera were the most abundant species found. Surprisingly, we found that among ten strains isolated from the treated soil, only six were resistant to the herbicide. Furthermore, bacterial overlay experiments showed that only one resistant strain (related to Stenotrophomonas maltophilia) allowed all the sensitive strains tested to grow in the presence of the herbicide. The other resistant strains allowed only certain sensitive strains to grow. On the basis of these results, we propose that there must be several biodegradation pathways for this sulfonylurea herbicide. 相似文献
225.
Untangling outcomes of de jure and de facto community‐based management of natural resources
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)
We systematically reviewed the literature on the tragedy of the commons and common‐property resources. We segregated studies by legal management regimes (de jure regimes) and management that develops in practice (de facto regimes) to understand how the structure of regime formation affects the outcome of community management on sustainability of resource use. De facto regimes, developed within the community, are more likely to have positive impacts on the resource. However, de facto regimes are fragile and not resilient in the face of increased population pressure and unregulated markets, and de facto management regimes are less successful where physical exclusion of external agents from resources is more difficult. Yet, formalization or imposition of de jure management regimes can have complicated impacts on sustainability. The imposition of de jure regimes usually has a negative outcome when existing de facto regimes operate at larger scales than the imposed de jure regime. In contrast, de jure regimes have largely positive impacts when the de facto regimes operate at scales smaller than the overlying de jure regimes. Formalization may also be counterproductive because of elite capture and the resulting de facto privatization (that allows elites to effectively exclude others) or de facto open access (where the disenfranchised may resort to theft and elites cannot effectively exclude them). This underscores that although the global movement to formalize community‐management regimes may address some forms of inequity and may produce better outcomes, it does not ensure resource sustainability and may lead to greater marginalization of users. Comparison of governance systems that differentiate between initiatives that legitimize existing de facto regimes and systems that create new de facto regimes, investigations of new top‐down de jure regimes, and studies that further examine different approaches to changing de jure regimes to de facto regimes are avenues for further inquiry. 相似文献
226.
Penn CJ Vitale J Fine S Payne J Warren JG Zhang H Eastman M Herron SL 《Journal of environmental quality》2011,40(1):233-241
Transportation of poultry litter out of nutrient limited watersheds such as the Illinois River basin (eastern Oklahoma) is a logical solution for minimizing phosphorus (P) losses from soils to surface waters. Transportation costs are basedon mass of load and distance transported. This study investigated an alternative litter storage technique designed to promote carbon (C) degradation, thereby concentrating nutrients for the purpose of decreasing transportation costs through decreased mass. Poultry litter was stored in 0.90-Mg conical piles under semipermeable tarps and adjusted to 40% moisture content, tested with and without addition of alum (aluminum sulfate). additional study was conducted using 3.6-Mg piles under the same conditions, except tested with and without use of aeration pipes. Samples were analyzed before and after (8 wk) storage. Litter mass degradation (i.e., loss in mass due to organic matter decomposition) was estimated on the basis of changes in litter total P contents. Additional characterization included pH, total nutrients, moisture content, total C, and degree of humification. Litter storage significantly decreased litter mass (16 to 27%), concentrated nutrients such as P and potassium (K) and increased proportion of fulvic and humic acids. The addition of aeration pipes increased mass degradationrelative to piles without aeration pipes. Nitrogen volatilization losses were minimized with alum additions. Increases in P and K concentrations resulted in greater monetary value per unit mass compared with fresh litter. Such increases translate to increased litter shipping distance and cost savings of $17.2 million over 25 yr for litter movement out of eastern Oklahoma. 相似文献
227.
Gettel M Gulliver JS Kayhanian M DeGroot G Brand J Mohseni O Erickson AJ 《Journal of environmental monitoring : JEM》2011,13(10):2703-2709
Suspended solids either as total suspended solids (TSS) or suspended sediment concentration (SSC) is an integral particulate water quality parameter that is important in assessing particle-bound contaminants. At present, nearly all stormwater runoff quality monitoring is performed with automatic samplers in which the sampling intake is typically installed at the bottom of a storm sewer or channel. This method of sampling often results in a less accurate measurement of suspended sediment and associated pollutants due to the vertical variation in particle concentration caused by particle settling. In this study, the inaccuracies associated with sampling by conventional intakes for automatic samplers have been verified by testing with known suspended sediment concentrations and known particle sizes ranging from approximately 20 μm to 355 μm under various flow rates. Experimental results show that, for samples collected at a typical automatic sampler intake position, the ratio of sampled to feed suspended sediment concentration is up to 6600% without an intake strainer and up to 300% with a strainer. When the sampling intake is modified with multiple sampling tubes and fitted with a wing to provide lift (winged arm sampler intake), the accuracy of sampling improves substantially. With this modification, the differences between sampled and feed suspended sediment concentration were more consistent and the sampled to feed concentration ratio was accurate to within 10% for particle sizes up to 250 μm. 相似文献
228.
Tianjiao Wang Paul Scuffham Joshua Byrnes Martin B. Delatycki Martin Downes 《黑龙江环境通报》2023,43(11):1416-1424
Background & Aim
Reproductive carrier screening seeks to identify couples at a high risk of having offspring affected by autosomal recessive and X-linked (XL) conditions. The aim of this paper is to provide a comprehensive overview of existing carrier screening panels by examining their gene content and characteristics, identifying the most common genes/conditions included in these panels, and analyzing their listed prices.Methods
A comprehensive evaluation of existing carrier screening panels was conducted by searching for web-based content, reviewing information brochures, and establishing direct contact with the providers via email or phone.Results
Twenty-two panels and their providers were identified with a cumulative total of 2205 unique genes. The number of genes included in these panels varied from 44 to 2054. Only 15 genes (0.7%) were included in all the panels. The carrier frequency of these 15 common genes and their associated conditions varied greatly, but the conditions associated with the genes are “severe”. The price of these 22 panels ranged from $349 to $4320 per couple (USD in 2023). The correlation between the listed price and the number of selected genes among these panels was small and not statistically significant (r = 0.1023, p = 0.6959).Conclusion
Considerable discrepancies exist among carrier screening panels. Ongoing research and monitoring are necessary to capture the dynamic nature of the carrier screening landscape, providing up-to-date information for clinical practice and informed decision-making. 相似文献229.
Resilience to global food supply catastrophes 总被引:1,自引:0,他引:1
230.
While various studies have compared metropolitan and rural residents' displays of environmentalism, recent shifts in the housing and energy markets make intra-metropolitan differences in urban and suburban attitudes and actions more interesting. The housing market crash and accompanying rise in fuel costs are prompting a return of centralisation to many communities and, it is believed, are drawing environmentally conscious residents downtown closer to work and play. Past research has found that this trend – demonstrated by a re-centralising housing market – was already underway, pre-crash, in Louisville, Kentucky over the “boom” period from 2000 to 2006. Drawing on original 2006 survey data for Louisville, this study regresses two components of environmentalism (behaviour and concern) on socio-demographics and residence. Findings show urbanites in Louisville are indeed significantly more environmentally friendly in their behaviour but not in their concern. Countering some claims, residents of single-family homes also exhibit significantly higher levels of environmental behaviour and concern than those residing in apartments and condominiums. Finally, in a surprise finding, recent movers from the suburbs to the city do not differ in their behaviour and are significantly less concerned about the environment than urbanites, suburbanites, and all metropolitan residents. 相似文献