全文获取类型
收费全文 | 2747篇 |
免费 | 17篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 77篇 |
废物处理 | 141篇 |
环保管理 | 263篇 |
综合类 | 484篇 |
基础理论 | 555篇 |
环境理论 | 2篇 |
污染及防治 | 819篇 |
评价与监测 | 250篇 |
社会与环境 | 186篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 26篇 |
2022年 | 87篇 |
2021年 | 104篇 |
2020年 | 51篇 |
2019年 | 42篇 |
2018年 | 98篇 |
2017年 | 100篇 |
2016年 | 122篇 |
2015年 | 72篇 |
2014年 | 115篇 |
2013年 | 178篇 |
2012年 | 126篇 |
2011年 | 171篇 |
2010年 | 123篇 |
2009年 | 112篇 |
2008年 | 124篇 |
2007年 | 112篇 |
2006年 | 75篇 |
2005年 | 118篇 |
2004年 | 160篇 |
2003年 | 149篇 |
2002年 | 98篇 |
2001年 | 75篇 |
2000年 | 34篇 |
1999年 | 34篇 |
1998年 | 15篇 |
1997年 | 26篇 |
1996年 | 18篇 |
1995年 | 22篇 |
1994年 | 17篇 |
1993年 | 8篇 |
1992年 | 11篇 |
1991年 | 16篇 |
1990年 | 9篇 |
1989年 | 11篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1986年 | 8篇 |
1985年 | 10篇 |
1984年 | 10篇 |
1983年 | 11篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1979年 | 8篇 |
1975年 | 3篇 |
1970年 | 3篇 |
1968年 | 3篇 |
1966年 | 3篇 |
1964年 | 4篇 |
1961年 | 3篇 |
排序方式: 共有2797条查询结果,搜索用时 171 毫秒
751.
Tolerance to iron accumulation and its effects on mineral composition and growth of two grass species 总被引:1,自引:0,他引:1
Talita Oliveira de Araújo Larisse de Freitas-Silva Brenda Vila Nova Santana Kacilda Naomi Kuki Eduardo Gusmão Pereira Aristéa Alves Azevedo Luzimar Campos da Silva 《Environmental science and pollution research international》2014,21(4):2777-2784
This study aimed to assess the influence of excess iron on the capacity of accumulation of this heavy metal, mineral composition, and growth of Setaria parviflora and Paspalum urvillei. Seedlings were submitted to 0.009; 1; 2; 4; and 7 mM of Fe-EDTA. In both species there was an increase in the concentration of Fe, Zn, P, and Ca and a decrease in Mn, K, and Mg in the iron plaque. Both species accumulated more iron in roots. In the shoots, S. parviflora showed higher iron content, except at 7 mM. Iron altered the contents of Fe, Cu, K, and Mg in roots, and of Fe, Mn, Zn, N, P, K, Ca, and Mg in shoots. The two species tolerated high iron concentrations and accumulated high content of this element in both shoots and roots. The iron did not reduce their growth. Both species are indicated for studies aiming restoration of iron-contaminated areas. 相似文献
752.
Márcia da Silva Carvalho Araceli Cristina de Sousa Ferreira 《Resources, Conservation and Recycling》2011,55(11):1030-1038
The Urban Cleaning Company of the City of Rio de Janeiro - COMLURB launched the Recycling Separation Center Project (Projeto Central de Separação de Recicláveis or CSR) in 2003. The objectives of the project were the adequate disposal of solid urban waste as well as the generation of employment and income. The COMLURB Project had economic, environmental and social facets, and the researchers sought to establish whether COMLURB had prepared reports that would enable evaluation of the investment made and the results obtained. In particular, the researchers sought to establish whether COMLURB financial statements set out the results of actions inherent to the CSR. We concluded from our analysis of the Project that the three elements of sustainability (social, environmental and economic), despite being fully present, were not adequately demonstrated. This study therefore proposes a model report with a view to enabling various information users to evaluate the results of the CSR Project. 相似文献
753.
754.
755.
756.
Carlos E. C. Freitas Alexandre A. F. Rivas Fabíola A. Nascimento Flávia K. Siqueira-Souza Ivanildo L. A. Santos 《Environment, Development and Sustainability》2008,10(2):157-165
An important alternative for sustainable use of tucunaré stocks and improvement in fishermen welfare in Balbina reservoir,
Central Amazon, would be to train commercial fisherman to also become tourist guides for sport fishing. In this study, we
modeled fishermen response to this question, in order to evaluate the acceptance of such an idea. Thus, we surveyed 47 fishermen,
who currently comprise approximately 75% of the total fishermen population. This survey was implemented during December of
2001 and January of 2002. We used a probity analysis to run two models. The first model includes the variables: family size,
school level, fishing time, residence time and boat ownership. On the other hand, the second model includes the number of
children under and above eight years old but not the family size. Both models are significant and the most relevant variables
are: fishing time (years of participation of fisherman is in the activity) and residence time (length of residency of particular fishermen live at the village nearby the reservoir). 相似文献
757.
758.
759.