全文获取类型
收费全文 | 11285篇 |
免费 | 28篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 53篇 |
废物处理 | 826篇 |
环保管理 | 1499篇 |
综合类 | 1209篇 |
基础理论 | 3473篇 |
环境理论 | 4篇 |
污染及防治 | 2164篇 |
评价与监测 | 1124篇 |
社会与环境 | 971篇 |
灾害及防治 | 5篇 |
出版年
2023年 | 22篇 |
2022年 | 20篇 |
2021年 | 25篇 |
2020年 | 24篇 |
2019年 | 24篇 |
2018年 | 1491篇 |
2017年 | 1399篇 |
2016年 | 1222篇 |
2015年 | 167篇 |
2014年 | 63篇 |
2013年 | 132篇 |
2012年 | 526篇 |
2011年 | 1425篇 |
2010年 | 761篇 |
2009年 | 677篇 |
2008年 | 953篇 |
2007年 | 1312篇 |
2006年 | 85篇 |
2005年 | 91篇 |
2004年 | 104篇 |
2003年 | 128篇 |
2002年 | 171篇 |
2001年 | 47篇 |
2000年 | 36篇 |
1999年 | 20篇 |
1998年 | 28篇 |
1997年 | 23篇 |
1996年 | 18篇 |
1995年 | 23篇 |
1994年 | 25篇 |
1993年 | 13篇 |
1992年 | 16篇 |
1991年 | 15篇 |
1990年 | 12篇 |
1989年 | 12篇 |
1988年 | 17篇 |
1987年 | 12篇 |
1986年 | 15篇 |
1984年 | 19篇 |
1983年 | 18篇 |
1982年 | 11篇 |
1981年 | 9篇 |
1980年 | 7篇 |
1979年 | 10篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1974年 | 6篇 |
1955年 | 5篇 |
1954年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
Abel Duarte Alonso 《The Environmentalist》2009,29(4):388-397
Despite aquaculture’s contribution providing an additional food source or employment in rural areas, this industry is often
presented in a controversial way, including its impact on the environment. However, an argument can also be made in favour
of aquaculture operators and their efforts to follow environmentally sound practices. Along these lines, the present study
investigates operators’ stance on environmental sustainability from a group of 26 Western Australian marron growers. Overall,
the findings demonstrate growers’ commitment to grow marron environmentally, for instance, without the use of fertilisers
or feeding. Furthermore, respondents are in agreement with the potential effects of environmentally unfriendly practices,
especially as in many cases marron growing is a complement to rural activities such as horticulture and cattle farming. At
the other end, some operators voice concerns on a different environmental issue, namely, the challenge that increasing droughts
and lack of sufficient rain is posing to their industry. 相似文献
42.
Kirk R. Vincent Jonathan M. Friedman Eleanor R. Griffin 《Environmental management》2009,44(2):218-227
Removal of nonnative riparian trees is accelerating to conserve water and improve habitat for native species. Widespread control
of dominant species, however, can lead to unintended erosion. Helicopter herbicide application in 2003 along a 12-km reach
of the Rio Puerco, New Mexico, eliminated the target invasive species saltcedar (Tamarix spp.), which dominated the floodplain, as well as the native species sandbar willow (Salix exigua Nuttall), which occurred as a fringe along the channel. Herbicide application initiated a natural experiment testing the
importance of riparian vegetation for bank stability along this data-rich river. A flood three years later eroded about 680,000 m3 of sediment, increasing mean channel width of the sprayed reach by 84%. Erosion upstream and downstream from the sprayed
reach during this flood was inconsequential. Sand eroded from channel banks was transported an average of 5 km downstream
and deposited on the floodplain and channel bed. Although vegetation was killed across the floodplain in the sprayed reach,
erosion was almost entirely confined to the channel banks. The absence of dense, flexible woody stems on the banks reduced
drag on the flow, leading to high shear stress at the toe of the banks, fluvial erosion, bank undercutting, and mass failure.
The potential for increased erosion must be included in consideration of phreatophyte control projects. 相似文献
43.
A Comparative Approach for Ranking Contaminated Sites Based on the Risk Assessment Paradigm Using Fuzzy PROMETHEE 总被引:2,自引:0,他引:2
A ranking system for contaminated sites based on comparative risk methodology using fuzzy Preference Ranking Organization
METHod for Enrichment Evaluation (PROMETHEE) was developed in this article. It combines the concepts of fuzzy sets to represent
uncertain site information with the PROMETHEE, a subgroup of Multi-Criteria Decision Making (MCDM) methods. Criteria are identified
based on a combination of the attributes (toxicity, exposure, and receptors) associated with the potential human health and
ecological risks posed by contaminated sites, chemical properties, site geology and hydrogeology and contaminant transport
phenomena. Original site data are directly used avoiding the subjective assignment of scores to site attributes. When the
input data are numeric and crisp the PROMETHEE method can be used. The Fuzzy PROMETHEE method is preferred when substantial
uncertainties and subjectivities exist in site information. The PROMETHEE and fuzzy PROMETHEE methods are both used in this
research to compare the sites. The case study shows that this methodology provides reasonable results. 相似文献
44.
45.
46.
Christian Mougin Agnès Bouchez Laurence Denaix Isabelle Lamy François Laurent Fabrice Martin-Laurent Michel Mench 《Environmental science and pollution research international》2016,23(4):2974-2976
The fifth meeting of INRA’s national network of ecotoxicologists took place on 25 to 27 November 2014 in Biarritz, France. The main aim of the meeting was to bring together ecotoxicologists from INRA and associated partners, providing them ample opportunity to share and discuss their latest scientific results as well as the national policy of research in ecotoxicology and to precise perspectives for the network. 相似文献
47.
48.
Fethi Amri 《Environmental science and pollution research international》2017,24(17):14567-14578
This study examines the relation between CO2 emissions, income, non-renewable, and renewable energy consumption in Algeria during the period extending from 1980 to 2011. Our work gives particular attention to the validity of environmental Kuznets curve (EKC) hypothesis. The autoregressive distributed lag (ARDL) with break point method outcome demonstrates the positive effect of non-renewable type of energy on CO2 emissions consumption. On the contrary, the results reveal an insignificant effect of renewable energy on environment improvement. Moreover, the results accept the existence of EKC hypothesis but the highest gross domestic product value in logarithm scale of our data is inferior to the estimated turning point. Consequently, policy-makers in Algeria should expand the ratio of renewable energy and should decrease the quota of non-renewable energy consumption. 相似文献
49.
Xu Li Zimeng Liu Qing Xu Zhongyi Jiang Guoliang Ma 《Environmental Modeling and Assessment》2017,22(3):243-255
In this paper, we construct a multi-stage coordinated programming model under tax system to control SO2 emission. The model is based on an explicitly formulated SO2 abatement cost function created under Chinese condition. Analysis of the effectiveness and impact on the economy of the model is carried out with consideration of game theory. By solving the model, theoretical results show that the volume-based multi-stage SO2 tax system has two properties: effectiveness and equal-rate. Based on these theoretical results, empirical study is also performed using Chinese historical data. Compared with yearly single-stage programming model, the tax rate generated by the coordinated multi-stage programming model is time-invariant and rather moderate in scale. The total abatement cost among planning years in our model is 21.03 % less than the actual number and 6.68 % less than that in the single-stage situation. The tax payment suggested by our model is 10.62 % less than by the single-stage model. In general, a coordinated multi-stage programming model helps reduce the overall costs of environmental protection while achieving the same emission control target with less burden added to the economy. 相似文献
50.
Metrics of water scarcity and stress have evolved over the last three decades from simple threshold indicators to holistic measures characterising human environments and freshwater sustainability. Metrics commonly estimate renewable freshwater resources using mean annual river runoff, which masks hydrological variability, and quantify subjectively socio-economic conditions characterising adaptive capacity. There is a marked absence of research evaluating whether these metrics of water scarcity are meaningful. We argue that measurement of water scarcity (1) be redefined physically in terms of the freshwater storage required to address imbalances in intra- and inter-annual fluxes of freshwater supply and demand; (2) abandons subjective quantifications of human environments and (3) be used to inform participatory decision-making processes that explore a wide range of options for addressing freshwater storage requirements beyond dams that include use of renewable groundwater, soil water and trading in virtual water. Further, we outline a conceptual framework redefining water scarcity in terms of freshwater storage. 相似文献