全文获取类型
收费全文 | 10171篇 |
免费 | 899篇 |
国内免费 | 1424篇 |
专业分类
安全科学 | 1366篇 |
废物处理 | 162篇 |
环保管理 | 1901篇 |
综合类 | 5692篇 |
基础理论 | 1311篇 |
环境理论 | 7篇 |
污染及防治 | 448篇 |
评价与监测 | 510篇 |
社会与环境 | 783篇 |
灾害及防治 | 314篇 |
出版年
2024年 | 45篇 |
2023年 | 149篇 |
2022年 | 265篇 |
2021年 | 376篇 |
2020年 | 423篇 |
2019年 | 288篇 |
2018年 | 228篇 |
2017年 | 414篇 |
2016年 | 405篇 |
2015年 | 482篇 |
2014年 | 524篇 |
2013年 | 578篇 |
2012年 | 718篇 |
2011年 | 819篇 |
2010年 | 635篇 |
2009年 | 577篇 |
2008年 | 410篇 |
2007年 | 665篇 |
2006年 | 706篇 |
2005年 | 528篇 |
2004年 | 513篇 |
2003年 | 459篇 |
2002年 | 373篇 |
2001年 | 322篇 |
2000年 | 291篇 |
1999年 | 249篇 |
1998年 | 170篇 |
1997年 | 146篇 |
1996年 | 129篇 |
1995年 | 118篇 |
1994年 | 100篇 |
1993年 | 83篇 |
1992年 | 68篇 |
1991年 | 35篇 |
1990年 | 24篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 12篇 |
1986年 | 17篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 9篇 |
1980年 | 16篇 |
1979年 | 11篇 |
1978年 | 10篇 |
1977年 | 8篇 |
1974年 | 6篇 |
1971年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 671 毫秒
71.
略谈淮北市城市景观生态建设 总被引:1,自引:0,他引:1
为了保护淮北市城市生态环境,拟利用城市景观生态学原理对该市城市景观进行生态设计,包括城市自然组分、非自然组分设计。自然组分包括种群源、廊道、节点等内容,力争使自然组分成为环境质量的控制性组分,使城市生态良性循环、物种多样并持续存在和流动可达,物质循环、能量流动、信息传递畅通。 相似文献
72.
利用EXCEL强大的数据处理功能,可以方便地对精密度—偏性分析质控数据进行处理,具有较高的推广价值。 相似文献
73.
74.
75.
Economic development and environmental protection: an ecological economics perspective 总被引:5,自引:0,他引:5
Rees WE 《Environmental monitoring and assessment》2003,86(1-2):29-45
This paper argues on both theoretical and empirical grounds that, beyond a certain point, there is an unavoidable conflictbetween economic development (generally taken to mean 'materialeconomic growth') and environmental protection. Think for a moment of natural forests, grasslands, marine estuaries, salt marshes, and coral reefs; and of arable soils, aquifers, mineraldeposits, petroleum, and coal. These are all forms of 'natural capital' that represent highly-ordered self-producing ecosystemsor rich accumulations of energy/matter with high use potential (low entropy). Now contemplate despoiled landscapes, eroding farmlands, depleted fisheries, anthropogenic greenhouse gases,acid rain, poisonous mine tailings and toxic synthetic compounds.These all represent disordered systems or degraded forms of energy and matter with little use potential (high entropy). The main thing connecting these two states is human economic activity. Ecological economics interprets the environment-economyrelationship in terms of the second law of thermodynamics. The second law sees economic activity as a dissipative process. Fromthis perspective, the production of economic goods andservices invariably requires the consumption of available energy and matter. To grow and develop, the economynecessarily 'feeds' on sources of high-quality energy/matter first produced by nature. This tends to disorder and homogenizethe ecosphere, The ascendance of humankind has consistently been accompanied by an accelerating rate of ecological degradation, particularly biodiversity loss, the simplificationof natural systems and pollution. In short, contemporary political rhetoric to the contrary, the prevailing growth-oriented global development paradigm is fundamentally incompatible with long-term ecological and social sustainability. Unsustainability is not a technical nor economic problem as usually conceived, but rather a state of systemic incompatibilitybetween a economy that is a fully-contained, growing, dependent sub-system of a non-growing ecosphere. Potential solutions fly inthe face of contemporary development trends and cultural values. 相似文献
76.
长江流域等重污染行业经济和污染贡献率剖析 总被引:4,自引:0,他引:4
应用"污染贡献率"这一指标,分析了长江、黄河、珠江和松花江流域COD和氨氮排放的重污染行业以及地区分布,指出了各流域COD和氨氮排放的控制重点.同时分析了各流域重污染行业的经济贡献率,最后结合行业的污染贡献率和经济贡献率以及行业在地区所占的比例,提出了几点重要的结论. 相似文献
77.
对室内装饰装修材料检测中甲醛分析方法的研究 总被引:2,自引:0,他引:2
目前室内装饰装修材料中甲醛含量的检测有六个类别,分析方法不统一,且没有一定的质量控制措施.文章对分析方法进行了改进,并且研究用水中的甲醛标样来对检测过程进行质量控制,结果较好. 相似文献
78.
79.
Visuthismajarni P Vitayavirasuk B Leeraphante N Kietpawpan M 《Environmental monitoring and assessment》2005,104(1-3):409-418
The potential ecological risks associated with contaminants from 15 abandoned shrimp ponds in southern Thailand were assessed at the screening level. Shrimp ponds reported as out of production for more than 2 years were selected as sampling sites. The assessment endpoint was identified as the protection of aquatic life from hazard of multiple agents or stressors in water or sediment from the ponds. The measurement endpoints were amount of toxic phytoplankton species, Yellow Head Viruses, SEMB viruses, oxytetracycline, cadmium, copper, and manganese. Data from field measurements and laboratory analyses obtained primarily from April to June 2003 were used in the risk analysis. The results showed that insignificant amounts of stressors were present, except for the metals. So, only concentration values of the metals were used in the calculation of hazard quotients (HQ) for risk characterization. The highest potential ecological risk characterized by the highest HQ value observed for each metal was 19 for manganese, 4.3 for cadmium, and 1.8 for copper. These findings indicated a need for further ecological risk assessment at a more detailed level to focus on the bioavailability and effects of metals from abandoned shrimp farms, with manganese the highest priority. 相似文献
80.
Wiersma YF 《Environmental monitoring and assessment》2005,100(1-3):1-9
Environmental benchmarks are widely used in Canadian environmental assessment as a standard against which to monitor air or water quality in response to human activities in the environment. Recent work in Canada has developed the concept of ecological benchmarks as a complement to environmental benchmarks. However, implementation of ecological benchmarks may be challenging. This paper presents an analogy between ecological benchmarks and the more commonly used environmental benchmarks, as an attempt to increase understanding and use of ecological benchmarks in resource management, assessment, and monitoring. Ecological benchmarks, and their corresponding indicators, will be challenging to identify and use. However, through the use of the principles of adaptive management, effective ecological indicators and benchmarks can be established. Although it is essential that ecological benchmarks are site-specific, the analogy and general principles outlined here are applicable to assessment and monitoring in any part of the world. 相似文献