全文获取类型
收费全文 | 13344篇 |
免费 | 137篇 |
国内免费 | 99篇 |
专业分类
安全科学 | 396篇 |
废物处理 | 502篇 |
环保管理 | 1993篇 |
综合类 | 2282篇 |
基础理论 | 3547篇 |
环境理论 | 8篇 |
污染及防治 | 3228篇 |
评价与监测 | 840篇 |
社会与环境 | 676篇 |
灾害及防治 | 108篇 |
出版年
2023年 | 68篇 |
2022年 | 115篇 |
2021年 | 125篇 |
2020年 | 101篇 |
2019年 | 108篇 |
2018年 | 191篇 |
2017年 | 180篇 |
2016年 | 269篇 |
2015年 | 232篇 |
2014年 | 301篇 |
2013年 | 995篇 |
2012年 | 430篇 |
2011年 | 581篇 |
2010年 | 463篇 |
2009年 | 529篇 |
2008年 | 586篇 |
2007年 | 591篇 |
2006年 | 535篇 |
2005年 | 472篇 |
2004年 | 403篇 |
2003年 | 430篇 |
2002年 | 392篇 |
2001年 | 495篇 |
2000年 | 374篇 |
1999年 | 228篇 |
1998年 | 158篇 |
1997年 | 185篇 |
1996年 | 186篇 |
1995年 | 213篇 |
1994年 | 206篇 |
1993年 | 174篇 |
1992年 | 146篇 |
1991年 | 180篇 |
1990年 | 179篇 |
1989年 | 170篇 |
1988年 | 128篇 |
1987年 | 125篇 |
1986年 | 129篇 |
1985年 | 99篇 |
1984年 | 124篇 |
1983年 | 124篇 |
1982年 | 130篇 |
1981年 | 126篇 |
1980年 | 103篇 |
1979年 | 131篇 |
1978年 | 80篇 |
1977年 | 84篇 |
1976年 | 68篇 |
1975年 | 81篇 |
1973年 | 75篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
231.
232.
233.
Dr. O. W. Jones Nolan E. Penn Stephen Shuchter Claire A. Stafford Teri Richards Colleen Kernahan Jennifer Gutierrez Patricia Cherkin Sylvia Reinsch Barbara Dixson 《黑龙江环境通报》1984,4(4):249-256
This article reports the results of a retrospective study designed to examine the responses of couples to genetic amniocentesis and subsequent therapeutic abortions due to birth defects. Fourteen women and 12 men were interviewed by experienced interviewers using a structured format designed by the authors, and each interview was audiotaped for later rating. The 5 raters (all women) were instructed to independently rate each interview using forms designed by the authors to elicit information about many aspects of the participant's individual responses as well as perceptions of spouse's responses to the process of pregnancy, amniocentesis, therapeutic abortion, and sequelae. Ratings of all 5 raters were conjoined and an homogeneous narrative was constructed for each interview. Results indicate, in general, that the respondent couples coped well with this experience. In fact 70 per cent of the respondent couples described their marital relationships as becoming closer as a result of their experience. Only a few participants reported long-term deleterious effects. Most couples coped by relying on relatives, friends, and occasionally, professional counsellors. In addition, most participants in this study suggested ways to improve the medical and psychological aspects of this experience. 相似文献
234.
235.
236.
237.
Helmut Haberl Christoph Plutzar Karl-Heinz Erb Veronika Gaube Martin Pollheimer Niels B. Schulz 《Agriculture, ecosystems & environment》2005,110(3-4):119-131
The relationship between land-use induced changes in production ecology and avifauna diversity was analysed using a GIS land cover dataset on a 0.25 km × 0.25 km grid covering Austria's national territory. Considering only aboveground processes, the “human appropriation of net primary production” (HANPP = potential NPP − NPPt), actual NPP (NPPact), harvest (NPPh) and NPPt (= NPPact − harvest) were recalculated based on existing datasets. Elevation as well as indicators of land cover heterogeneity and landscape heterogeneity were also considered. Correlation analyses were performed between these potential determinants of avifauna diversity and breeding bird species richness data as well as the percentage of endangered breeding birds included in the Austrian red list. Four spatial scales—0.25 km × 0.25 km, 1 km × 1 km, 4 km × 4 km and 16 × 16 km, were analysed. It was shown that breeding bird species richness was more strongly correlated with production ecological indicators and elevation than with heterogeneity indicators. A residual analysis in which the effect of elevation (a proxy for climate) on species richness and its potential determinants was removed confirmed the importance of the availability of trophic energy (NPP) for bird diversity patterns. The results support the species-energy hypothesis, thus confirming the notion that HANPP could be a useful pressure indicator for biodiversity loss. 相似文献
238.
239.
240.