全文获取类型
收费全文 | 1790篇 |
免费 | 56篇 |
国内免费 | 21篇 |
专业分类
安全科学 | 88篇 |
废物处理 | 70篇 |
环保管理 | 406篇 |
综合类 | 175篇 |
基础理论 | 506篇 |
环境理论 | 5篇 |
污染及防治 | 417篇 |
评价与监测 | 122篇 |
社会与环境 | 53篇 |
灾害及防治 | 25篇 |
出版年
2023年 | 18篇 |
2022年 | 36篇 |
2021年 | 48篇 |
2020年 | 24篇 |
2019年 | 42篇 |
2018年 | 53篇 |
2017年 | 59篇 |
2016年 | 78篇 |
2015年 | 49篇 |
2014年 | 66篇 |
2013年 | 151篇 |
2012年 | 84篇 |
2011年 | 127篇 |
2010年 | 79篇 |
2009年 | 94篇 |
2008年 | 105篇 |
2007年 | 97篇 |
2006年 | 104篇 |
2005年 | 54篇 |
2004年 | 50篇 |
2003年 | 59篇 |
2002年 | 45篇 |
2001年 | 26篇 |
2000年 | 44篇 |
1999年 | 20篇 |
1998年 | 19篇 |
1997年 | 9篇 |
1996年 | 21篇 |
1995年 | 18篇 |
1994年 | 20篇 |
1993年 | 10篇 |
1992年 | 11篇 |
1991年 | 9篇 |
1990年 | 8篇 |
1989年 | 12篇 |
1988年 | 11篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 10篇 |
1982年 | 13篇 |
1981年 | 14篇 |
1980年 | 4篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1975年 | 4篇 |
1969年 | 4篇 |
1958年 | 2篇 |
排序方式: 共有1867条查询结果,搜索用时 15 毫秒
611.
Daniel L. McLaughlin David A. Kaplan Matthew J. Cohen 《Journal of the American Water Resources Association》2013,49(4):953-965
With growing populations fueling increased groundwater abstraction and forecasts of greater water scarcity in the southeastern United States, identifying land management strategies that enhance water availability will be vital to maintaining hydrologic resources and protecting natural systems. Management of forested uplands for lower basal area, currently a priority for habitat improvement on public lands, may also increase water yield through decreased evapotranspiration (ET). To explore this hypothesis, we synthesized studies of precipitation and ET in coastal plain pine stands to develop a statistical model of water yield as a function of management strategy, stand structure, and ecosystem water use. This model allowed us to estimate changes in water yield in response to varying management strategies across spatial scales from the individual stand to a regional watershed. Results suggest that slash pine stands managed at lower basal areas can have up to 64% more cumulative water yield over a 25‐year rotation compared to systems managed for high‐density timber production, with the greatest increases in stands also managed for recurrent understory fire. Although there are important uncertainties in the magnitude of additional water yield and its final destination (i.e., surface water bodies vs. groundwater), this analysis highlights the potential for management activities on public and private timber lands to partially offset increasing demand on surface and groundwater resources. 相似文献
612.
Abstract The German cockroach is the most common pest of urban, low-income housing in the United States and is associated with high pesticide use by residents. Cockroach allergen is implicated in asthma exacerbation and initiation and in the growing social and medical aspects of the disease. A safe and secure home environment is an environmental justice issue, and environmentally sound and effective models of cockroach control are needed in public and low-income multifamily housing. One model that offers potential is the integrated pest management (IPM) peer educator model (IPM Educator) in public housing as a component of IPM. A pre–post-analysis of an IPM Educator pilot programme in Boston public housing was undertaken. Thirty-four moderate- to high-infested units received baseline assessment and three applications of gel baits and IPM treatment by a pest control operator. Before the first pest control application, residents received written notice to prepare their units for treatment, a standard procedure. Before the second and third pest control treatments, an IPM Educator instructed residents in basic pest biology and habits, preparation for treatment, and the role of sanitation in pest control. Results showed a significant improvement in rate of preparation for pest control treatment after the IPM Educator intervention when compared with the preparation rate before the education intervention, and a significant reduction in cockroach populations by the third visit in units that were prepared and had improved sanitation, when compared with unprepared units and unclean units. The IPM peer educator is a promising, low-cost model of educating and engaging residents of urban, low-income, multifamily housing in environmentally sound pest control, thereby giving them some power and control over their living environment. It is also a potential source of professional training and jobs for public housing and other low-income housing residents. 相似文献
613.
614.
Daniel Simberloff 《Conservation biology》1994,8(4):1166-1167
615.
616.
Lisa J. Henne Daniel W. Schneider Luis M. Martinez 《Journal of Environmental Planning and Management》2002,45(5):613-632
The cost-effectiveness of rapid assessment approaches make their adaptation for use in developing countries appealing, but biological assessment methods need to be validated before use in new geographic areas. The authors tested the suitability of a family-level biotic index for use in a river in west-central Mexico that receives organic point-source pollution from untreated municipal sewage and sugar-cane processing. The biotic index was highly correlated to dissolved oxygen, and could detect different levels of pollution. Information from rapid assessment biomonitoring was used successfully by local natural resource managers to help bring about improvements in water resource management. 相似文献
617.
618.
Albert C. F. Lam Daniel H. C. Chan Tony M. F. Tong Mary H. Y. Tang Steven Y. F. Lo Ivan F. M. Lo Stephen T. S. Lam 《黑龙江环境通报》2006,26(11):1018-1020
We present the first confirmed case by molecular analysis of a metaphyseal chondrodysplasia, McKusick type, in a 22-week fetus. Two novel compound heterozygous mutations, 64T> A and 79G > T, were found in the highly conserved regions of the RMRP gene. Twenty-two heterozygous g.1018 T> C mutations, two homozygous g.1018 T> C mutations, two heterozygous insertion mutations g.799_g.800insC and one heterozygous insertion mutation g.849_g.850insT were found among 100 normal controls. Careful radiological examination of the fetus for skeletal dysplasia allowed definitive diagnosis, proper genetic counselling and future prenatal diagnosis. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
619.
620.