全文获取类型
收费全文 | 248篇 |
免费 | 11篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 8篇 |
废物处理 | 13篇 |
环保管理 | 48篇 |
综合类 | 19篇 |
基础理论 | 78篇 |
环境理论 | 1篇 |
污染及防治 | 69篇 |
评价与监测 | 11篇 |
社会与环境 | 14篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 8篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 11篇 |
2014年 | 7篇 |
2013年 | 36篇 |
2012年 | 11篇 |
2011年 | 18篇 |
2010年 | 11篇 |
2009年 | 7篇 |
2008年 | 13篇 |
2007年 | 12篇 |
2006年 | 14篇 |
2005年 | 6篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1972年 | 1篇 |
1968年 | 1篇 |
1966年 | 2篇 |
排序方式: 共有263条查询结果,搜索用时 390 毫秒
141.
Adams MB 《Environment international》2003,29(2-3):189-199
There has and continues to be concern about the effects of elevated nitrogen (N) deposition on natural ecosystems. In this paper, research on natural ecosystems, including wetlands, heathlands, grasslands, steppe, naturally regenerated forests and deserts, is evaluated to determine what is known about nitrogen cycling in these ecosystems, the effects of elevated nitrogen on them and to identify research gaps. Aquatic ecosystems are not included in this review, except as they are part of the larger ecosystem. Research needs fall into several categories: (1) improved understanding and quantification of the N cycle, particularly relatively unstudied processes such as dry deposition, N fixation and decomposition/mineralization; (2) carbon cycling as affected by increased N deposition; (3) effects on arid ecosystems and other "neglected" ecosystems; (4) effects on complex ecosystems and interactions with other pollutants; (5) indicators and assessment tools for natural ecosystems. 相似文献
142.
The adverse effects of stratospheric ozone depletion on human health and welfare is a major environmental concern. One potential welfare effect is reduction in plant productivity, including agricultural crops, due to increased UV-B radiation and tropospheric ozone formation. This paper evaluates the economic effects of potential changes in crop yields due to hypothetical depletions in stratospheric ozone over regions of the U.S.A. Results suggest that increases in tropospheric ozone due to a 15 per cent stratospheric ozone depletion may cause economic losses of around 0·9 billion dollars. Combined effects of both tropospheric ozone and UV-B radiation range from 1·3 to 2·5 billion dollars. These estimates are preliminary, given the high degree of uncertainty in key plant science and aerometric data. 相似文献
143.
Oluwafemi S. Obayori Sunday A. Adebusoye Adams O. Adewale Ganiyu O. Oyetibo Odunola O. Oluyemi Rashid A. Amokun Matthew O. Ilori 《环境科学学报(英文版)》2009,21(2):243-248
Four hydrocarbon degraders isolated from enriched oil- and asphalt-contaminated soils in Lagos, Nigeria, were tested for their
petroleum degradation potentials. All the isolates were identified as species of Pseudomonas. Pseudomonas putida P11 demonstrated a
strong ability to degrade kerosene, gasoline, diesel, engine oil and crude oil while P. aeruginosa BB3 exhibited fair degradative ability
on crude oil, gasoline, engine oil, anthracene and pyrene but weak on kerosene, diesel and dibenzothiophene. Pseudomonas putida
WL2 and P. aeruginosa MVL1 grew on crude oil and all its cuts tested with the latter possessing similar polycyclic aromatic potentials
as P11. All the strains grew logarithmically with 1–2 orders of magnitude and with generation time ranging significantly between 3.07
and 8.55 d at 0.05 level of confidence. Strains WL2 and MVL1 utilized the oil substrate best with more than 70% in 6 d experimental
period, whereas the same feat was achieved by P11 in 12 d period. BB3 on the other hand degraded only 46% within 6 d. Interestingly,
data obtained from gas chromatographic analysis of oil recovered from the culture fluids of MVL1 confirmed near-disappearance of
major peaks (including aliphatics and aromatics) in the hydrocarbon mixture. 相似文献
144.
145.
Although colonies of the fire ant Solenopsis invicta are often founded by small groups of queens, all but one of the queens are soon eliminated due to worker attacks and queen
fighting. The elimination of supernumerary queens provides an important context for tests of discrimination by the workers,
since the outcome of these interactions strongly affects the workers' inclusive fitness. To test whether workers in newly
founded colonies discriminate among nestmate queens, paired cofoundresses were narrowly separated by metal screens that prevented
direct fighting, but through which the workers could easily pass. Soon after the first workers completed development, they
often attacked one of the queens; these attacks were strongly associated with queen mortality. When one queen's brood was
discarded, so that the adult workers were all the daughters of just one queen, the workers were significantly less likely
to bite their mother than the unrelated queen; however, this tendency was comparatively weak. Queens kept temporarily at a
higher temperature to increase their rate of investment in brood-rearing lost weight more rapidly than paired queens and were
subsequently more likely to be attacked and killed by workers. Workers were more likely to bite queens that had been temporarily
isolated than queens that remained close to brood and workers. When queens were not separated by screens, the presence of
workers stimulated queen fights. These results show that workers discriminate strongly among equally familiar queens and that
discrimination is based more on the queens' condition and recent social environment than on kinship.
Received: 9 June 1998 / Accepted after revision: 10 October 1998 相似文献
146.
Adams ML Zhao FJ McGrath SP Nicholson FA Chambers BJ 《Journal of environmental quality》2004,33(2):532-541
The entry of Cd into the food chain is of concern as it can cause chronic health problems. To investigate the relationship between soil properties and the concentration of Cd in wheat (Triticum aestivum L.) and harley (Hordeum vulgare L.) grain, we analyzed 162 wheat and 215 barley grain samples collected from paired soil and crop surveys in Britain, and wheat and barley samples from two long-term sewage sludge experiments. Cadmium concentrations were much lower in barley grain than in wheat grain under comparable soil conditions. Multiple regression analysis showed that soil total Cd and pH were the significant factors influencing grain Cd concentrations. Significant cultivar differences in Cd uptake were observed for both wheat and barley. Wheat grain Cd concentrations could be predicted reasonably well from soil total Cd and pH using the following model: log(grain Cd) = a + b log(soil Cd) - c(soil pH), with 53% of the variance being accounted for. The coefficients obtained from the data sets of the paired soil and crop surveys and from long-term sewage sludge experiments were similar, suggesting similar controlling factors of Cd bioavailability in sludge-amended or unamended soils. For barley, the model was less satisfactory for predicting grain Cd concentration (22% of variance accounted for). The model can be used to predict the likelihood of wheat grain Cd exceeding the new European Union (EU) foodstuff regulations on the maximum permissible concentration of Cd under different soil conditions, particularly in relation to the existing Directive and the proposed new Directive on land applications of sewage sludge. 相似文献
147.
Waha Katharina Krummenauer Linda Adams Sophie Aich Valentin Baarsch Florent Coumou Dim Fader Marianela Hoff Holger Jobbins Guy Marcus Rachel Mengel Matthias Otto Ilona M. Perrette Mahé Rocha Marcia Robinson Alexander Schleussner Carl-Friedrich 《Regional Environmental Change》2017,17(6):1623-1638
Regional Environmental Change - The Middle East and North Africa (MENA) region emerges as one of the hot spots for worsening extreme heat, drought and aridity conditions under climate change. A... 相似文献
148.
F. E. Jonah O. Adams D. W. Aheto R. E. Jonah E. A. Mensah 《Journal of Coastal Conservation》2017,21(3):343-353
Coastal erosion is a serious environmental problem that has caused the loss of private infrastructure and national assets along Ghana’s coast. Several hard engineering measures have thus been used to protect some communities and vital state assets when they became threatened. Regardless of this problem, sediment mining activities are increasingly practiced along most of Ghana’s coast, further exacerbating coastal erosion intensity and degrading coastal ecosystems. This paper provides an overview of the activities of coastal sediment miners along four administrative Districts in the Central Region of Ghana and identifies how issues arising from the practice are managed at the local community level as well as by state environmental regulators. The study uses a mixed-method approach, involving individual and group interviews, administration of a set of structured questionnaire and field observations, to identify coastal sediment mining and emerging management issues. Overall, three main categories of coastal sediment mining activities were identified in the area. Results indicate that coastal sediment mining is widely practiced by both commercial contractors and community members, giving rise to the high perception among residents that it is the reason for the degradation of the coastline in the studied areas. The study also established that state environmental regulators have weak inter-agency cooperation leading to poor enforcement of environmental laws and non-prosecution of offending individuals. The paper suggests that since each identified sediment mining activity has its own peculiar issues and mode of operation, coastal managers should address each category independently in order to derive lasting impacts in curtailing the practice. 相似文献
149.
Urgast DS Adams GC Raab A Feldmann J 《Journal of environmental monitoring : JEM》2010,12(5):1126-1132
European whelks (Buccinum undatum) have shown to accumulate high levels of arsenic. Since the accumulation process is not well understood it is necessary to gain information about the geographical variability of the arsenic concentration in them. Here we show that the mean arsenic concentrations of the whelks are site specific and vary by a factor of 3.5 in ten different geographical locations. At fishing grounds where whelks exhibited low arsenic concentrations the arsenic concentration increased linearly with size, whereas the whelks with high arsenic levels from a different location showed no correlation. Although the overall arsenic concentration in the whelks differed between 45 and 655 mg kg(-1) d.w., the inorganic arsenic concentration did not exceed 0.4 mg kg(-1) d.w. The main arsenic compound is arsenobetaine, which is widely considered as non-toxic. The exposure to toxic inorganic arsenic when eating whelks cannot be estimated from their size or their total arsenic concentration. 相似文献
150.
Junge T Meyer KC Ciecielski K Adams A Schaffer A Schmidt B 《Journal of environmental science and health. Part. B》2011,46(2):137-149
Recently, we reported on soil fate of SDZ residues amended with pig manure treated with 1?C-labeled sulfadiazine 1?C-SDZ). The first objective of the present study was to determine whether this strategy can be substituted by application of 1?C-SDZ to soil. The second objective was to characterize non-extractable SDZ residues by fractionation, size exclusion chromatography (SEC) and solid state 13C-NMR. The fate of 1?C-SDZ was examined for 28 d, using two soils with and without amendment of pig manure. Mineralization of 1?C-SDZ was low; extractable residues decreased to 7-30%. Compared to the previous study, results were similar. 1?C-SDZ derived bound radioactivity was found in HCl-washings, fulvic, humic acids and humin. According to SEC, one bound 1?C portion (70%) co-eluted with fulvic acids (above 910 g mol?1); the other consisted of adsorbed/entrapped 1?C-SDZ. The 13C-SDZ study was performed for 30 d; humic acids were examined by 13C-NMR. A signal (100-150 ppm) was referred to 13C-SDZ. SEC and 13C-NMR demonstrated rapid integration of SDZ into humics. 相似文献