全文获取类型
收费全文 | 2588篇 |
免费 | 162篇 |
国内免费 | 671篇 |
专业分类
安全科学 | 190篇 |
废物处理 | 146篇 |
环保管理 | 303篇 |
综合类 | 1529篇 |
基础理论 | 694篇 |
环境理论 | 1篇 |
污染及防治 | 324篇 |
评价与监测 | 125篇 |
社会与环境 | 94篇 |
灾害及防治 | 15篇 |
出版年
2024年 | 1篇 |
2023年 | 23篇 |
2022年 | 51篇 |
2021年 | 60篇 |
2020年 | 87篇 |
2019年 | 78篇 |
2018年 | 66篇 |
2017年 | 83篇 |
2016年 | 99篇 |
2015年 | 111篇 |
2014年 | 171篇 |
2013年 | 233篇 |
2012年 | 214篇 |
2011年 | 251篇 |
2010年 | 212篇 |
2009年 | 161篇 |
2008年 | 153篇 |
2007年 | 217篇 |
2006年 | 198篇 |
2005年 | 137篇 |
2004年 | 121篇 |
2003年 | 119篇 |
2002年 | 96篇 |
2001年 | 97篇 |
2000年 | 71篇 |
1999年 | 73篇 |
1998年 | 37篇 |
1997年 | 39篇 |
1996年 | 27篇 |
1995年 | 20篇 |
1994年 | 26篇 |
1993年 | 19篇 |
1992年 | 19篇 |
1991年 | 8篇 |
1990年 | 15篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 3篇 |
排序方式: 共有3421条查询结果,搜索用时 91 毫秒
71.
72.
73.
A pot experiment was conducted to investigate the influence of elemental sulfur to contaminated soil on plant uptake by a heavy metal hyperaccumulator, Indian mustard( Brassica juncea ) and a field crop, winter wheat( Triticum. aestivum). Elemental sulfur(S) with different rates was carried out, they were 0(S0 ), 20(S20 ), 40(S40 ), 80(S80 ), and 160(S160 ) mmol/kg respectively. Extra pots with the same rates of S but without plants were used for soil sampling to monitor pH and CaCl2-extractable heavy metal changes. The results showed that S enhanced phytoextraction of Pb and Zn from contaminated soil. Application S effectively decreased soil pH down to 1.1 as the most at the rate of Sl60. The concentrations of CaCl2-extractable Pb and Zn in soil and uptake of Pb and Zn by the plants were increased with soil pH decreased. A good correlation between CaCl2-extractable Pb/Zn and soil pH was found( Rpb^2 = 0.847 and RZn^2 = 0,991, n = 25). With S application, soil CaCl2-extractable Pb and Zn concentrations, concentration of Pb and Zn in plants and the amount of removal by plant uptake were significanfly higher than those without S. Under the treatment of S160, the highest CaCl2-extmctable Pb and Zn were observed, they were 4.23 mg/kg and 0.40 mg/kg, 2.7 and 2.0 times as that of the control(So ) respectively. At the highest rates of S( Sl~0 ), both Indian mustard and winter wheat reached the highest uptake of Pb and Zn. The highest Pb concentrations in wheat and Indian mustard were 32.8 mg/kg and 537.0 mg/kg, all 1.8 times as that of the control, and the highest Zn concentrations in wheat and Indian mustard were 215.5 mg/kg and 404.0 mg/kg, 2.4 and 2.0 times as that of the control respectively. The highest removals of Pb and Zn from the contaminated soil were 0.41 rag/pot and 0.31 nag/pot by Indian mustard in the treatment of S160 through 50 days growth. 相似文献
74.
电厂温排水对水库生态环境的影响 总被引:3,自引:1,他引:3
本文报告了电厂温排水对陡河水库生态环境的影响。结果表明,陡河水库年均水温比对照水体洋河水库提高2.8~4.8℃。溶解氧随着水温而变化,但从未低于5.0mg/l,增温后水体中各种营养盐类含量呈增加趋势,水体富营养化明显。 相似文献
75.
76.
77.
78.
Xi Haiyan Cai Qiang He Miao Shi Hanchang 《Frontiers of Environmental Science & Engineering in China》2007,1(3):381-384
This research describes a fast detection method on the basis of enzyme-linked immunosorbent assay (ELISA) for Escherichia coli in drainage of wastewater treatment plants. Optimized conditions such as the reaction format (sandwich or direct), the concentrations
of diluted horseradish peroxidase (HRP)-E. coli conjugate, and anti-HPR antibody and pretreatment of E. coli were studied. Those results showed that the linear range of detection for E. coli was 10 cfu/mL-6 × 104 cfu/mL. Compared with conventional methods, it is a convenient and sensitive detection method with low cost.
Translated from Environmental Science, 2005, 26(5): 128–131 [译自: 环境科学] 相似文献
79.
80.
针对电力和供热导致石家庄市空气污染严重的问题,结合该市目前的电力和供热现状,提出了减少污染的措施及建议,希望对改善该市空气质量起到促进作用。 相似文献