全文获取类型
收费全文 | 24128篇 |
免费 | 327篇 |
国内免费 | 433篇 |
专业分类
安全科学 | 713篇 |
废物处理 | 1055篇 |
环保管理 | 3187篇 |
综合类 | 4359篇 |
基础理论 | 5905篇 |
环境理论 | 14篇 |
污染及防治 | 6495篇 |
评价与监测 | 1545篇 |
社会与环境 | 1473篇 |
灾害及防治 | 142篇 |
出版年
2023年 | 148篇 |
2022年 | 312篇 |
2021年 | 321篇 |
2020年 | 252篇 |
2019年 | 229篇 |
2018年 | 462篇 |
2017年 | 405篇 |
2016年 | 657篇 |
2015年 | 468篇 |
2014年 | 722篇 |
2013年 | 1973篇 |
2012年 | 924篇 |
2011年 | 1219篇 |
2010年 | 920篇 |
2009年 | 1021篇 |
2008年 | 1135篇 |
2007年 | 1200篇 |
2006年 | 996篇 |
2005年 | 806篇 |
2004年 | 799篇 |
2003年 | 763篇 |
2002年 | 706篇 |
2001年 | 790篇 |
2000年 | 628篇 |
1999年 | 381篇 |
1998年 | 252篇 |
1997年 | 272篇 |
1996年 | 244篇 |
1995年 | 334篇 |
1994年 | 255篇 |
1993年 | 243篇 |
1992年 | 214篇 |
1991年 | 220篇 |
1990年 | 223篇 |
1989年 | 222篇 |
1988年 | 182篇 |
1987年 | 163篇 |
1986年 | 179篇 |
1985年 | 173篇 |
1984年 | 210篇 |
1983年 | 184篇 |
1982年 | 198篇 |
1981年 | 191篇 |
1980年 | 160篇 |
1979年 | 179篇 |
1978年 | 115篇 |
1977年 | 116篇 |
1975年 | 113篇 |
1974年 | 108篇 |
1972年 | 119篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
891.
Many reports and studies have noted that a significant portion of problem-oriented coastal science does not actually link to decisions. Here, three competitively funded project case studies are studied to determine what funders can and should do to better link science with decisions. The qualitative analysis used for this study indicates that the studied program was seen as being unusually attentive to the issue of linking science to decisions, as opposed to simply generating new knowledge. Nevertheless, much of the data indicate that funders can and should do more. Three ideas figured most prominently in the qualitative data: (1) funders should do more to ensure that the problem itself is defined more thoroughly with people who are envisioned as potential users of the science; (2) funders need to allocate more resources and attention to communicating effectively (with users) throughout the project; and (3) funders need to demand more engagement of users throughout the project. These findings have important implications for how funders review and support science, especially when competitive processes are used. Most importantly, funders should adjust what kind of science they ask for. Secondly, funders need to change who is involved in the review process. Currently, review processes focus on knowledge generation, which means that the reviewers themselves have expertise in that area. Instead, review panels should be balanced between those who focus on knowledge generation and those who focus on linking knowledge to decisions; this is a separate but critical discipline currently left out of the review process. 相似文献
892.
Jeffrey D. Fore Scott P. Sowa David L. Galat Gust M. Annis David D. Diamond Charles Rewa 《Environmental management》2014,53(3):567-582
Managers can improve conservation of lotic systems over large geographies if they have tools to assess total watershed conditions for individual stream segments and can identify segments where conservation practices are most likely to be successful (i.e., primary management capacity). The goal of this research was to develop a suite of threat indices to help agriculture resource management agencies select and prioritize watersheds across Missouri River basin in which to implement agriculture conservation practices. We quantified watershed percentages or densities of 17 threat metrics that represent major sources of ecological stress to stream communities into five threat indices: agriculture, urban, point-source pollution, infrastructure, and all non-agriculture threats. We identified stream segments where agriculture management agencies had primary management capacity. Agriculture watershed condition differed by ecoregion and considerable local variation was observed among stream segments in ecoregions of high agriculture threats. Stream segments with high non-agriculture threats were most concentrated near urban areas, but showed high local variability. 60 % of stream segments in the basin were classified as under U.S. Department of Agriculture’s Natural Resources Conservation Service (NRCS) primary management capacity and most segments were in regions of high agricultural threats. NRCS primary management capacity was locally variable which highlights the importance of assessing total watershed condition for multiple threats. Our threat indices can be used by agriculture resource management agencies to prioritize conservation actions and investments based on: (a) relative severity of all threats, (b) relative severity of agricultural threats, and (c) and degree of primary management capacity. 相似文献
893.
J. Morgan Grove Dexter H. Locke Jarlath P. M. O’Neil-Dunne 《Environmental management》2014,54(3):402-419
Several social theories have been proposed to explain the uneven distribution of vegetation in urban residential areas: population density, social stratification, luxury effect, and ecology of prestige. We evaluate these theories using a combination of demographic and socio-economic predictors of vegetative cover on all residential lands in New York City. We use diverse data sources including the City’s property database, time-series demographic and socio-economic data from the US Census, and land cover data from the University of Vermont’s Spatial Analysis Lab (SAL). These data are analyzed using a multi-model inferential, spatial econometrics approach. We also examine the distribution of vegetation within distinct market categories using Claritas’ Potential Rating Index for Zipcode Markets (PRIZM?) database. These categories can be disaggregated, corresponding to the four social theories. We compare the econometric and categorical results for validation. Models associated with ecology of prestige theory are more effective for predicting the distribution of vegetation. This suggests that private, residential patterns of vegetation, reflecting the consumption of environmentally relevant goods and services, are associated with different lifestyles and lifestages. Further, our spatial and temporal analyses suggest that there are significant spatial and temporal dependencies that have theoretical and methodological implications for understanding urban ecological systems. These findings may have policy implications. Decision makers may need to consider how to most effectively reach different social groups in terms of messages and messengers in order to advance land management practices and achieve urban sustainability. 相似文献
894.
895.
896.
897.
Hernández-Sancho F Molinos-Senante M Sala-Garrido R 《Journal of environmental monitoring : JEM》2011,13(12):3448-3459
Efficiency and productivity are important measures for identifying best practice in businesses and optimising resource-use. This study analyses how these two measures change across the period 2003-2008 for 196 wastewater treatment plants (WWTPs) in Spain, by using the benchmarking methods of Data Envelopment Analysis and the Malmquist Productivity Index. To identify which variables contribute to the sustainability of the WWTPs, differences in efficiency scores and productivity indices for external factors are also investigated. Our results indicate that both efficiency and productivity decreased over the five years. We verify that the productivity drop is primarily explained by technical change. Furthermore, certain external variables affected WWTP efficiency, including plant size, treatment technology and energy consumption. However, plants with low energy consumption are the only ones which improve their productivity. Finally, the benchmarking analyses proved to be useful as management tools in the wastewater sector, by providing vital information for improving the sustainability of plants. 相似文献
898.
Behaviour of different lichen species as biomonitors of air pollution by PAHs in natural ecosystems 总被引:2,自引:0,他引:2
Six different species of lichens (Parmelia sulcata Tayl., Evernia prunastri (L.) Ach., Ramalina farinacea, Pseudevernia furfuracea (L.) Zopf., Usnea sp. and Lobaria pulmonaria (Schreb.) Hoffm.) were collected in two mountain valleys in Central Pyrenees: the Aspe and Aragon valleys. Two multivariate techniques have been applied with different purposes, ANOVA and Discriminant Analysis (DA), to evaluate the data. The PAHs spatial distribution was studied in the three more abundant and widespread species in the area: P. sulcata, E. prunastri (L.) Ach. and R. farinacea in terms of total PAHs, PAHs related to the combustion processes and toxicity. Different behaviour of each lichen species to trap PAHs was found, being P. sulcata the best one to monitor the most persistent PAHs of pyrogenic origin and E. prunastri the most appropriate to provide information about pyrogenic and petrogenic PAHs. Traffic was the most relevant influence in PAHs bioaccumulation in lichen species. 相似文献
899.
Santos MJ Sousa JP Tiago I Veríssimo A Lemos MF 《Journal of environmental monitoring : JEM》2011,13(8):2102-2104
Changes in saprophytic organism's gut microbial communities may present a threat to organic matter breakdown which can ultimately lead to soil function impairment. In this study, Amplified Ribosomal DNA Restriction Analysis (ARDRA) was evaluated as a potential simple molecular tool to assess shifts in bacterial community structure in hindgut populations of Porcellio dilatatus exposed to contaminated food. This prospective tool can also be used for a variety of purposes and samples prior to the use of more specific and sophisticated methods. 相似文献
900.
Abayomi A Nimmo M Williams C Olayinka KO Osuntogun B Alo B Worsfold PJ 《Journal of environmental monitoring : JEM》2011,13(7):1884-1889
Roadside soils were sampled from the Lagos Lagoon catchment during the wet and dry seasons over the period 2005-2009. Lagoon sediment samples were also collected within the same period. All samples were digested with aqua regia to determine total phosphorus and extracted with 0.5 M sodium bicarbonate to determine the bioavailable fraction (Olsen-P). A segmented flow analyser method was used for analysis and good accuracy was demonstrated for two reference soils (SO-2 from CCMET and SRM 2711 from NIST). The Lagos Lagoon is a hypereutrophic water body (1270 ± 1170 μg P L(-1)), with significant areas of anoxia and water hyacinth growth. The total phosphorus concentrations in roadside soils (16 sites; mean ± 2 S.D.) were 285 ± 279 mg kg(-1) in the wet season and 424 ± 629 mg kg(-1) in the dry season, indicating that rainwater leaching is a major source of phosphorus in the lagoon. The bioavailable fractions were 5.17 ± 3.47 mg kg(-1) (2.1 ± 1.5% of the total) in the wet season and 13.0 ± 8.7 mg kg(-1) (4.3 ± 4.5% of the total) in the dry season. 相似文献