全文获取类型
收费全文 | 1100篇 |
免费 | 30篇 |
国内免费 | 24篇 |
专业分类
安全科学 | 52篇 |
环保管理 | 263篇 |
综合类 | 460篇 |
基础理论 | 147篇 |
环境理论 | 1篇 |
污染及防治 | 57篇 |
评价与监测 | 115篇 |
社会与环境 | 46篇 |
灾害及防治 | 13篇 |
出版年
2024年 | 3篇 |
2023年 | 11篇 |
2022年 | 12篇 |
2021年 | 24篇 |
2020年 | 54篇 |
2019年 | 12篇 |
2018年 | 14篇 |
2017年 | 31篇 |
2016年 | 37篇 |
2015年 | 25篇 |
2014年 | 49篇 |
2013年 | 41篇 |
2012年 | 38篇 |
2011年 | 74篇 |
2010年 | 41篇 |
2009年 | 86篇 |
2008年 | 60篇 |
2007年 | 64篇 |
2006年 | 60篇 |
2005年 | 37篇 |
2004年 | 33篇 |
2003年 | 52篇 |
2002年 | 47篇 |
2001年 | 29篇 |
2000年 | 41篇 |
1999年 | 35篇 |
1998年 | 25篇 |
1997年 | 13篇 |
1996年 | 13篇 |
1995年 | 21篇 |
1994年 | 8篇 |
1993年 | 19篇 |
1992年 | 13篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1977年 | 1篇 |
排序方式: 共有1154条查询结果,搜索用时 15 毫秒
691.
北京市妫水河流域景观生态学分析 总被引:2,自引:0,他引:2
基于GIS的空间分析平台,以景观生态学的方法建模,分析了北京市妫水河流域的景观格局特征,并与妫水河平原的景观格局特征进行了比较,发现在妫水河平原范围内,由于人为干扰程度的加剧,整体生态格局的异质性下降、碎裂化增加,景观生态格局的稳定性和安全性比之妫水河流域有所下降.分析了妫水河流域面临的问题及其原因,进而提出妫水河流域生态恢复的建议和措施. 相似文献
692.
Nitrogen deposition and its ecological impact in China: An overview 总被引:29,自引:0,他引:29
Xuejun Liu Lei DuanJiangming Mo Enzai DuJianlin Shen Xiankai LuYing Zhang Xiaobing ZhouChune He Fusuo Zhang 《Environmental pollution (Barking, Essex : 1987)》2011,159(10):2251-2264
Nitrogen (N) deposition is an important component in the global N cycle that has induced large impacts on the health and services of terrestrial and aquatic ecosystems worldwide. Anthropogenic reactive N (Nr) emissions to the atmosphere have increased dramatically in China due to rapid agricultural, industrial and urban development. Therefore increasing N deposition in China and its ecological impacts are of great concern since the 1980s. This paper synthesizes the data from various published papers to assess the status of the anthropogenic Nr emissions and N deposition as well as their impacts on different ecosystems, including empirical critical loads for different ecosystems. Research challenges and policy implications on atmospheric N pollution and deposition are also discussed. China urgently needs to establish national networks for N deposition monitoring and cross-site N addition experiments in grasslands, forests and aquatic ecosystems. Critical loads and modeling tools will be further used in Nr regulation. 相似文献
693.
城市辖区生态示范区建设规划中若干问题探讨 总被引:1,自引:0,他引:1
以国家生态示范区建设试点区——乌鲁木齐市沙依巴克区生态示范区为例,针对城市行政辖区作为复合生态系统相对独立性太弱的特点,对在规划中需特别注意的政府职责层次、示范区区域界定及建设区模式选择等问题进行了探讨,并根据该区生态示范区规划编制工作中的实际情况,提出了解决这些问题的基本思路。 相似文献
694.
We conducted a laboratory evaluation to assess the risk to early life stage (i.e., eyed egg to swim up) fall Chinook salmon
(Oncorhynchus tshawytscha) for exposure to hexavalent chromium from a contaminated groundwater source. Local populations of fall Chinook salmon were
exposed to Hanford Site source groundwater that was diluted with Columbia River water. Specific endpoints included survival,
development rate, and growth. Tissue burdens of fish were also measured to estimate uptake and elimination rates of chromium.
Survival, development, and growth of early life stage fall Chinook salmon were not adversely affected by extended exposures
(i.e., 98 day) to hexavalent chromium ranging from 0.79 to 260 μg/l. Survival for all treatment levels and controls exceeded
98% at termination of the test. In addition, there were no differences among the mean lengths and weights of fish among all
treatment groups. Whole-body concentrations of chromium in early life stage fall Chinook salmon had a typical dose-response
pattern; i.e., those subjected to highest exposure concentrations and longest exposure intervals had higher tissue concentrations.
Given the spatial extent of chromium concentrations at the Hanford Site, and the dynamics of the groundwater–river water interface,
the current cleanup criterion of 10 μg/l chromium appear adequate to protect early life stage fall Chinook salmon. These findings,
together with previous research indicate low risk to these populations. 相似文献
695.
696.
当前城镇化发展与城镇生态环境建设应该有机结合起来,走新型城镇化发展道路,结合绿色发展理念,将绿色、低碳、集约和智能贯彻到其中,从而更好推进城镇化发展。本文对此进行了深入探究,旨在促进城镇经济和社会更好发展。 相似文献
697.
698.
The condition of the semi-arid Borana rangeland in southern Ethiopia was assessed by studying different land-use systems (communal land, a government ranch and a traditional grazing reserve enclosure) and along a distance gradient (near, middle and far) from water sources. The assessment incorporated the soil, herbaceous and woody plant layers. Two methods were employed to evaluate the grass layer, viz. ecological condition index (ECI) and weighted palatability composition (WPC). The ECI on the government ranch was 21.7% and 26% greater than that of the traditional reserve and the communal land, respectively. The WPC on the government ranch was 83.3% and 48.6% greater than that of the communal area and the traditional reserve, respectively. Both ECI and WPC values were similar for all distance sites from water. Tree equivalent (TE) density, of all encroaching woody plants combined, was higher on the communal land (504 TE ha(-1)) than the government ranch (373 TE ha(-)1) and traditional grazing reserve (118 TE ha(-1)), but with no marked variations in the distance sites from water. Height class distribution of encroaching woody plants in the study areas showed the largest abundance (range: >50-100%) at the height class >0-2m. Tree equivalents per hectare of encroaching woody plants were negatively correlated (r = -0.60) with ECI and WPC and positively correlated (r=0.87) with percentage bare ground. The correlation (r = 0.50) between percentage bare ground and soil compaction was positive and low. Although the government ranch had a greater composition of highly palatable grass species than the other land uses, the rangeland was not in good condition due to severe bush encroachment. The communal land was generally in poor condition. In the traditional grazing reserve, bush encroachment was not a problem, but the productivity of the grass layer was poor when assessed on the basis of ecological and palatability merits. The negative interaction of TE density of all encroaching woody plants combined with ECI or WPC and the positive interaction with bare ground, may suggest that the abundance of these species is more critical in aggravating deterioration in grassland productivity. Therefore, the priority of any bush control program must be towards minimizing the abundance of these woody plants. 相似文献
699.
本文以生态环境监测工作为研究对象,以其在现阶段的应用开发状态为基础,分析未来科技成长中的发展趋势。在论述中,将生态环境监测的目标与特征内容作为理论基础,引出当前生态环境监测工作发展的现状问题,并针对管理体系、技术手段、"3S"开发这三个方面,为相关研究提供例证。 相似文献
700.
On the basis of data collected from Liupanshan poverty-ridden areas, the paper selects 24 variables under 4 groups to figure out the influencing factors of subjective well-being (SWB) of peasants in ecological migration with the method of Ordered Probit Regression. As is shown in the results, variables under peasants’ personal endowment group and resource of the development group have little impact on peasants’ SWB. The variables with observable impact are concentrated in the living condition group and the public atmosphere group. 相似文献