全文获取类型
收费全文 | 9397篇 |
免费 | 793篇 |
国内免费 | 2310篇 |
专业分类
安全科学 | 404篇 |
废物处理 | 170篇 |
环保管理 | 1921篇 |
综合类 | 6591篇 |
基础理论 | 1117篇 |
环境理论 | 9篇 |
污染及防治 | 700篇 |
评价与监测 | 1065篇 |
社会与环境 | 432篇 |
灾害及防治 | 91篇 |
出版年
2024年 | 55篇 |
2023年 | 206篇 |
2022年 | 301篇 |
2021年 | 384篇 |
2020年 | 398篇 |
2019年 | 332篇 |
2018年 | 280篇 |
2017年 | 384篇 |
2016年 | 402篇 |
2015年 | 475篇 |
2014年 | 483篇 |
2013年 | 696篇 |
2012年 | 618篇 |
2011年 | 694篇 |
2010年 | 562篇 |
2009年 | 556篇 |
2008年 | 456篇 |
2007年 | 633篇 |
2006年 | 641篇 |
2005年 | 465篇 |
2004年 | 428篇 |
2003年 | 470篇 |
2002年 | 400篇 |
2001年 | 367篇 |
2000年 | 351篇 |
1999年 | 259篇 |
1998年 | 192篇 |
1997年 | 169篇 |
1996年 | 152篇 |
1995年 | 113篇 |
1994年 | 112篇 |
1993年 | 76篇 |
1992年 | 70篇 |
1991年 | 57篇 |
1990年 | 43篇 |
1989年 | 18篇 |
1988年 | 13篇 |
1987年 | 29篇 |
1986年 | 17篇 |
1985年 | 11篇 |
1984年 | 6篇 |
1982年 | 15篇 |
1981年 | 18篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1978年 | 16篇 |
1977年 | 8篇 |
1973年 | 10篇 |
1972年 | 9篇 |
1971年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 937 毫秒
641.
根据对哈尔滨市所辖8区蔬菜生产基地土壤环境的调查和监测,利用土壤综合污染指数进行评价,哈尔滨市蔬菜生产基地土壤质量状况。 相似文献
642.
643.
城市雨水径流污染控制技术 总被引:4,自引:0,他引:4
城市雨水径流特别是初期雨水污染严重,是水体富营养化、水华以及海域赤潮等环境问题产生的根源之一.分析了径流污染产生的特点,概括了城市雨水径流污染控制的必要性,并着重论述了径流污染控制技术. 相似文献
644.
645.
膜分离作为一门新型的高效分离、浓缩、提纯和净化技术,是支撑循环经济和可持续发展的重要技术.详细分析了污水处理过程中膜故障产生机理,并给出了相应的防治对策. 相似文献
646.
运用多元回归法,通过预测模型的选择、数学模型的建立、基础数据的整理和回归效果的检验,建立环境污染范围与诸条件的关系,达到快速估算的目的,从而形成一种有效的大气环境污染事故范围预测的方法. 相似文献
647.
648.
Carroll S Goonetilleke A Thomas E Hargreaves M Frost R Dawes L 《Environmental management》2006,38(2):286-303
Onsite wastewater treatment systems (OWTS) are becoming increasingly important for the treatment and dispersal of effluent
in new urbanised developments that are not serviced by centralised wastewater collection and treatment systems. However, the
current standards and guidelines adopted by many local authorities for assessing suitable site and soil conditions for OWTS
are increasingly coming under scrutiny due to the public health and environmental impacts caused by poorly performing systems,
in particular septic tank-soil adsorption systems. In order to achieve sustainable onsite wastewater treatment with minimal
impacts on the environment and public health, more appropriate means of assessment are required. This paper highlights an
integrated risk based approach for assessing the inherent hazards associated with OWTS in order to manage and mitigate the
environmental and public health risks inherent with onsite wastewater treatment. In developing a sound and cohesive integrated
risk framework for OWTS, several key issues must be recognised. These include the inclusion of relevant stakeholders throughout
framework development, the integration of scientific knowledge, data and analysis with risk assessment and management ideals,
and identification of the appropriate performance goals for successful management and mitigation of associated risks. These
issues were addressed in the development of the risk framework to provide a generic approach to assessing risk from OWTS.
The utilisation of the developed risk framework for achieving more appropriate assessment and management techniques for OWTS
is presented in a case study for the Gold Coast region, Queensland State, Australia. 相似文献
649.
Soil pollution with Cd is an environmental problem common in the world, and it is necessary to establish what Cd concentrations
in soil could be dangerous to its fertility from toxicity effects and the risk of transference of this element to plants and
other organisms of the food chain. In this study, we assessed Cd toxicity on soil microorganisms and plants in two semiarid
soils (uncultivated and cultivated). Soil ATP content, dehydrogenase activity, and plant growth were measured in the two soils
spiked with concentrations ranging from 3 to 8000 mg Cd/kg soil and incubated for 3 h, 20 days, and 60 days. The Cd concentrations
that produced 5%; 10%;, and 50%; inhibition of each of the two soil microbiological parameter studied (ecological dose, ED,
values) were calculated using two different mathematical models. Also, the effect of Cd concentration on plant growth of ryegrass
(Lolium perenne, L.) was studied in the two soils. The Cd ED values calculated for soil dehydrogenase activity and ATP content were higher
in the agricultural soils than in the bare soil. For ATP inhibition, higher ED values were calculated than for dehydrogenase
activity inhibition. The average yields of ryegrass were reduced from 5.03 to 3.56 g in abandoned soil and from 4.21 to 1.15
g in agricultural soil with increasing concentrations of Cd in the soil. Plant growth was totally inhibited in abandoned and
agricultural soils at Cd concentrations above 2000 and 5000 mg/kg soil, respectively. There was a positive correlation between
the concentration of Cd in the plants and the total or DTPA-extractable concentrations of Cd in the soil. 相似文献
650.
大宝山采矿活动对环境的重金属污染调查 总被引:2,自引:0,他引:2
调查了大宝山铁铜多金属矿床固体废弃物-水相互作用对环境的重金属污染,结果表明,矿床固体废弃物导致了水、土壤的重金属污染,污染元素主要有Cd、Cu、Pb、Zn等;重金属元素的水迁移强度由大至小顺序为Cr、Cu、Zn、Ni、Cd、As、Pb、Hg;元素的生物吸收系数由大至小顺序为Cd、Zn、Hg、Ni、Cu、Cr、As、Pb,虽然水稻糙米中的重金属含量未超过国家标准,但Cd、Cr两种元素含量已远远超出了植物中毒量的下限值. 相似文献