全文获取类型
收费全文 | 101285篇 |
免费 | 1241篇 |
国内免费 | 1149篇 |
专业分类
安全科学 | 3997篇 |
废物处理 | 3797篇 |
环保管理 | 15322篇 |
综合类 | 21519篇 |
基础理论 | 27903篇 |
环境理论 | 74篇 |
污染及防治 | 19687篇 |
评价与监测 | 6074篇 |
社会与环境 | 4629篇 |
灾害及防治 | 673篇 |
出版年
2022年 | 815篇 |
2021年 | 849篇 |
2020年 | 670篇 |
2019年 | 888篇 |
2018年 | 1348篇 |
2017年 | 1391篇 |
2016年 | 2299篇 |
2015年 | 1873篇 |
2014年 | 2605篇 |
2013年 | 9276篇 |
2012年 | 2677篇 |
2011年 | 3384篇 |
2010年 | 3508篇 |
2009年 | 3668篇 |
2008年 | 3030篇 |
2007年 | 2945篇 |
2006年 | 3053篇 |
2005年 | 2887篇 |
2004年 | 3157篇 |
2003年 | 2995篇 |
2002年 | 2575篇 |
2001年 | 3023篇 |
2000年 | 2337篇 |
1999年 | 1676篇 |
1998年 | 1428篇 |
1997年 | 1428篇 |
1996年 | 1563篇 |
1995年 | 1655篇 |
1994年 | 1533篇 |
1993年 | 1375篇 |
1992年 | 1384篇 |
1991年 | 1353篇 |
1990年 | 1306篇 |
1989年 | 1273篇 |
1988年 | 1120篇 |
1987年 | 1041篇 |
1986年 | 1015篇 |
1985年 | 1096篇 |
1984年 | 1194篇 |
1983年 | 1194篇 |
1982年 | 1192篇 |
1981年 | 1116篇 |
1980年 | 956篇 |
1979年 | 965篇 |
1978年 | 849篇 |
1977年 | 738篇 |
1976年 | 665篇 |
1974年 | 655篇 |
1973年 | 687篇 |
1972年 | 692篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
43.
44.
Jorge Alberto Vieira Costa Bárbara Catarina Bastos Freitas Camila Gonzales Cruz Jéssica Silveira Michele Greque Morais 《Journal of environmental science and health. Part. B》2019,54(5):366-375
The loss of yields from agricultural production due to the presence of pests has been treated over the years with synthetic pesticides, but the use of these substances negatively affects the environment and presents health risks for consumers and animals. The development of agroecological systems using biopesticides represents a safe alternative that contributes to the reduction of agrochemical use and sustainable agriculture. Microalgae are able to biosynthesize a number of metabolites with potential biopesticidal action and can be considered potential biological agents for the control of harmful organisms to soils and plants. The present work aims to provide a critical perspective on the consequences of using synthetic pesticides, offering as an alternative the biopesticides obtained from microalgal biomass, which can be used together with the implementation of environmentally friendly agricultural systems. 相似文献
45.
46.
Rebecca Niemiec Megan S. Jones Stacy Lischka Veronica Champine 《Conservation biology》2021,35(4):1073-1085
Research suggests that encouraging motivated residents to reach out to others in their social network is an effective strategy for increasing the scale and speed of conservation action adoption. However, little is known about how to effectively encourage large numbers of residents to reach out to others about conservation causes. We examined the influence of normative and efficacy-based messaging at motivating residents to engage in and to encourage others to participate in native plant gardening in their community. To do so, we conducted a field experiment with messages on mailings and tracked native plant vouchers used. Efficacy messages tended to be more effective than normative messages at increasing residents’ willingness to reach out to others to encourage conservation action, as indicated by a several percentage point increase in native plant voucher use by residents’ friends and neighbors. Messages sometimes had different impacts on residents based on past behaviors and perceptions related to native plant gardening. Among these subgroups, efficacy and combined efficacy and norm messages most effectively encouraged individual and collective actions, as indicated by increased voucher usage. Our findings suggest that interventions that build residents’ efficacy for engaging in a conservation behavior and for reaching out to others may be a promising path forward for outreach. However, given our results were significant at a false discovery rate cutoff of 0.25 but not 0.05, more experimental trials are needed to determine the robustness of these trends. 相似文献
47.
es Ruiz de Arcaute Celeste Ossana Natalia A. Pérez-Iglesias Juan Manuel Soloneski Sonia Larramendy Marcelo L. 《Environmental science and pollution research international》2019,26(20):20485-20498
Environmental Science and Pollution Research - Pesticides might increase the production of reactive oxygen species (ROS). Dicamba (DIC) and 2,4-dichlorophenoxyacetic acid (2,4-D) are auxinic... 相似文献
48.
49.
Understanding implications of consumer behavior for wildlife farming and sustainable wildlife trade 下载免费PDF全文
A. Nuno J. M. Blumenthal T. J. Austin J. Bothwell G. Ebanks‐Petrie B. J. Godley A. C. Broderick 《Conservation biology》2018,32(2):390-400
Unsustainable wildlife trade affects biodiversity and the livelihoods of communities dependent upon those resources. Wildlife farming has been proposed to promote sustainable trade, but characterizing markets and understanding consumer behavior remain neglected but essential steps in the design and evaluation of such operations. We used sea turtle trade in the Cayman Islands, where turtles have been farm raised for human consumption for almost 50 years, as a case study to explore consumer preferences toward wild‐sourced (illegal) and farmed (legal) products and potential conservation implications. Combining methods innovatively (including indirect questioning and choice experiments), we conducted a nationwide trade assessment through in‐person interviews from September to December 2014. Households were randomly selected using disproportionate stratified sampling, and responses were weighted based on district population size. We approached 597 individuals, of which 37 (6.2%) refused to participate. Although 30% of households had consumed turtle in the previous 12 months, the purchase and consumption of wild products was rare (e.g., 64–742 resident households consumed wild turtle meat [i.e., 0.3–3.5% of households] but represented a large threat to wild turtles in the area due to their reduced populations). Differences among groups of consumers were marked, as identified through choice experiments, and price and source of product played important roles in their decisions. Despite the long‐term practice of farming turtles, 13.5% of consumers showed a strong preference for wild products, which demonstrates the limitations of wildlife farming as a single tool for sustainable wildlife trade. By using a combination of indirect questioning, choice experiments, and sales data to investigate demand for wildlife products, we obtained insights about consumer behavior that can be used to develop conservation‐demand‐focused initiatives. Lack of data from long‐term social–ecological assessments hinders the evaluation of and learning from wildlife farming. This information is key to understanding under which conditions different interventions (e.g., bans, wildlife farming, social marketing) are likely to succeed. 相似文献
50.
Srichandan Suchismita Baliarsingh Sanjiba Kumar Prakash Satya Lotliker Aneesh A. Parida Chandanlal Sahu Kali Charan 《Environmental science and pollution research international》2019,26(12):12025-12041
Environmental Science and Pollution Research - Seasonal distribution of phytoplankton community and size structure was assessed in three different tropical ecosystems of the western Bay of Bengal... 相似文献