全文获取类型
收费全文 | 30143篇 |
免费 | 764篇 |
国内免费 | 4777篇 |
专业分类
安全科学 | 1439篇 |
废物处理 | 1559篇 |
环保管理 | 3555篇 |
综合类 | 9795篇 |
基础理论 | 6604篇 |
环境理论 | 13篇 |
污染及防治 | 9086篇 |
评价与监测 | 1475篇 |
社会与环境 | 1467篇 |
灾害及防治 | 691篇 |
出版年
2023年 | 278篇 |
2022年 | 740篇 |
2021年 | 640篇 |
2020年 | 536篇 |
2019年 | 503篇 |
2018年 | 772篇 |
2017年 | 818篇 |
2016年 | 938篇 |
2015年 | 1035篇 |
2014年 | 1422篇 |
2013年 | 2694篇 |
2012年 | 1630篇 |
2011年 | 2092篇 |
2010年 | 1520篇 |
2009年 | 1617篇 |
2008年 | 1726篇 |
2007年 | 1586篇 |
2006年 | 1391篇 |
2005年 | 1096篇 |
2004年 | 1004篇 |
2003年 | 1010篇 |
2002年 | 931篇 |
2001年 | 1006篇 |
2000年 | 879篇 |
1999年 | 723篇 |
1998年 | 540篇 |
1997年 | 545篇 |
1996年 | 522篇 |
1995年 | 530篇 |
1994年 | 390篇 |
1993年 | 365篇 |
1992年 | 288篇 |
1991年 | 276篇 |
1990年 | 243篇 |
1989年 | 236篇 |
1988年 | 200篇 |
1987年 | 153篇 |
1986年 | 178篇 |
1985年 | 154篇 |
1984年 | 199篇 |
1983年 | 157篇 |
1982年 | 181篇 |
1981年 | 160篇 |
1980年 | 131篇 |
1979年 | 149篇 |
1978年 | 94篇 |
1977年 | 99篇 |
1975年 | 88篇 |
1974年 | 93篇 |
1972年 | 96篇 |
排序方式: 共有10000条查询结果,搜索用时 727 毫秒
861.
Mao Guanghua Liu Hongyang Ding Yangyang Zhang Weijie Chen Hui Zhao Ting Feng Weiwei Wu Xiangyang Yang Liuqing 《Environmental science and pollution research international》2020,27(9):9318-9326
Environmental Science and Pollution Research - In this study, the immature mice were taken to assess the potential neurological toxicity of lead (Pb) and di (n-butyl) phthalates (DBP) combination... 相似文献
862.
Kun Zhang Jialuo Xu Qing Huang Lei Zhou Qingyan Fu Yusen Duan Guangli Xiu 《Frontiers of Environmental Science & Engineering》2020,14(6):92
863.
864.
Ma Jianlong Li Chuanhua Hu Lanyu Kong Wangsheng Lu Qing Zhang Jia 《Journal of Material Cycles and Waste Management》2021,23(2):614-621
Journal of Material Cycles and Waste Management - Electroplating sludge contained multi-metals and organics. In previous reports, electroplating sludges were usually recycled by direct calcination... 相似文献
865.
866.
NICK M. HADDAD LARS A. BRUDVIG ELLEN I. DAMSCHEN DANIEL M. EVANS BRENDA L. JOHNSON DOUGLAS J. LEVEY JOHN L. ORROCK JULIAN RESASCO LAUREN L. SULLIVAN JOSH J. TEWKSBURY STEPHANIE A. WAGNER AIMEE J. WELDON 《Conservation biology》2014,28(5):1178-1187
Despite many studies showing that landscape corridors increase dispersal and species richness for disparate taxa, concerns persist that corridors can have unintended negative effects. In particular, some of the same mechanisms that underlie positive effects of corridors on species of conservation interest may also increase the spread and impact of antagonistic species (e.g., predators and pathogens), foster negative effects of edges, increase invasion by exotic species, increase the spread of unwanted disturbances such as fire, or increase population synchrony and thus reduce persistence. We conducted a literature review and meta‐analysis to evaluate the prevalence of each of these negative effects. We found no evidence that corridors increase unwanted disturbance or non‐native species invasion; however, these have not been well‐studied concerns (1 and 6 studies, respectively). Other effects of corridors were more often studied and yielded inconsistent results; mean effect sizes were indistinguishable from zero. The effect of edges on abundances of target species was as likely to be positive as negative. Corridors were as likely to have no effect on antagonists or population synchrony as they were to increase those negative effects. We found 3 deficiencies in the literature. First, despite studies on how corridors affect predators, there are few studies of related consequences for prey population size and persistence. Second, properly designed studies of negative corridor effects are needed in natural corridors at scales larger than those achievable in experimental systems. Third, studies are needed to test more targeted hypotheses about when corridor‐mediated effects on invasive species or disturbance may be negative for species of management concern. Overall, we found no overarching support for concerns that construction and maintenance of habitat corridors may result in unintended negative consequences. Negative edge effects may be mitigated by widening corridors or softening edges between corridors and the matrix. Other negative effects are relatively small and manageable compared with the large positive effects of facilitating dispersal and increasing diversity of native species. Efectos Negativos Potenciales de los Corredores 相似文献
867.
Gong Weifeng Zhang Haixia Wang Chuanhui Wu Bin Yuan Yaqi Fan Shengjie 《Environmental science and pollution research international》2023,30(6):14641-14655
Environmental Science and Pollution Research - The Yellow River Basin is an energy-rich area. The low-carbon development of the Yellow River Basin is one of the ways to achieve ecological... 相似文献
868.
TERRA R. KELLY JESSE GRANTHAM DANIEL GEORGE ALACIA WELCH JOSEPH BRANDT L. JOSEPH BURNETT KELLY J. SORENSON MATTHEW JOHNSON ROBERT POPPENGA DAVID MOEN JAMES RASICO JAMES W. RIVERS CARIE BATTISTONE CHRISTINE K. JOHNSON 《Conservation biology》2014,28(6):1721-1730
Large‐scale poisoning events are common to scavenging bird species that forage communally, many of which are in decline. To reduce the threat of poisoning and compensate for other persistent threats, management, including supplemental feeding, is ongoing for many reintroduced and endangered vulture populations. Through a longitudinal study of lead exposure in California condors (Gymnogyps californianus), we illustrate the conservation challenges inherent in reintroduction of an endangered species to the wild when pervasive threats have not been eliminated. We evaluated population‐wide patterns in blood lead levels from 1997 to 2011 and assessed a broad range of putative demographic, behavioral, and environmental risk factors for elevated lead exposure among reintroduced California condors in California (United States). We also assessed the effectiveness of lead ammunition regulations within the condor's range in California by comparing condor blood lead levels before and after implementation of the regulations. Lead exposure was a pervasive threat to California condors despite recent regulations limiting lead ammunition use. In addition, condor lead levels significantly increased as age and independence from intensive management increased, including increasing time spent away from managed release sites, and decreasing reliance on food provisions. Greater independence among an increasing number of reintroduced condors has therefore elevated the population's risk of lead exposure and limited the effectiveness of lead reduction efforts to date. Our findings highlight the challenges of restoring endangered vulture populations as they mature and become less reliant on management actions necessary to compensate for persistent threats. Patrones Espaciotemporales y Factores de Riesgo por Exposición a Plomo en Cóndores de California Durante 15 Años de Reintroducción 相似文献
869.
Ana María Plata-Díaz José Luis Zafra-Gómez Gemma Pérez-López Antonio Manuel López-Hernández 《Waste management (New York, N.Y.)》2014,34(11):1967-1976
Identifying and characterising the factors that determine why a local authority opts for a particular way of managing its waste collection service is an important issue, warranting research interest in the field of municipal solid waste (MSW) management. This paper presents empirical evidence spanning a broad time horizon (2002–2010) showing that economic and political factors impact in different ways on the provision of waste management services. We examine five alternatives in this area, including public and private service delivery formulas and, within each field, individual and joint options. Our findings highlight the importance of the service cost and that of the various indicators of fiscal stress as determinant factors of management decisions regarding the provision of MSW management services. 相似文献
870.