全文获取类型
收费全文 | 30184篇 |
免费 | 343篇 |
国内免费 | 255篇 |
专业分类
安全科学 | 1027篇 |
废物处理 | 1465篇 |
环保管理 | 4050篇 |
综合类 | 4540篇 |
基础理论 | 7863篇 |
环境理论 | 9篇 |
污染及防治 | 7425篇 |
评价与监测 | 2147篇 |
社会与环境 | 2063篇 |
灾害及防治 | 193篇 |
出版年
2023年 | 149篇 |
2022年 | 269篇 |
2021年 | 336篇 |
2020年 | 204篇 |
2019年 | 262篇 |
2018年 | 448篇 |
2017年 | 484篇 |
2016年 | 738篇 |
2015年 | 547篇 |
2014年 | 863篇 |
2013年 | 2504篇 |
2012年 | 1040篇 |
2011年 | 1372篇 |
2010年 | 1120篇 |
2009年 | 1165篇 |
2008年 | 1433篇 |
2007年 | 1345篇 |
2006年 | 1232篇 |
2005年 | 1093篇 |
2004年 | 1049篇 |
2003年 | 999篇 |
2002年 | 950篇 |
2001年 | 1101篇 |
2000年 | 775篇 |
1999年 | 490篇 |
1998年 | 365篇 |
1997年 | 386篇 |
1996年 | 402篇 |
1995年 | 468篇 |
1994年 | 396篇 |
1993年 | 346篇 |
1992年 | 377篇 |
1991年 | 359篇 |
1990年 | 327篇 |
1989年 | 323篇 |
1988年 | 295篇 |
1987年 | 245篇 |
1986年 | 249篇 |
1985年 | 249篇 |
1984年 | 268篇 |
1983年 | 259篇 |
1982年 | 274篇 |
1981年 | 225篇 |
1980年 | 165篇 |
1979年 | 183篇 |
1978年 | 163篇 |
1977年 | 134篇 |
1975年 | 138篇 |
1973年 | 167篇 |
1972年 | 142篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
551.
Sequence functions were used to construct a simulation model of the long-term population dynamics of the bank vole in Karelia. The mechanisms of population reproduction control affect the population size if it is greater than 1 and 4 ind./100 trap-days in spring and autumn, respectively. 相似文献
552.
553.
I. A. Prokop’ev G. V. Filippova A. A. Shein D. V. Gabyshev 《Russian Journal of Ecology》2014,45(1):18-23
It has been shown that the growth of technogenic dust pollution is accompanied by the accumulation of heavy metals in soil and plant phytomass, compared to the control, and that the morphometric and reproductive characteristics of Matricaria chamomila are most sensitive to the impact of these pollutants. The response of plants is manifested in increased variation in morphological characters, mobilization of compensatory protective biochemical mechanisms, and production of more viable seed progeny. 相似文献
554.
555.
556.
Elisa Oteros-Rozas Berta Martín-López José A. González Tobias Plieninger César A. López Carlos Montes 《Regional Environmental Change》2014,14(4):1269-1289
The ecosystem services framework is receiving increasing attention in the fields of policy and research. The assessment of human attitudes and perceptions regarding ecosystem services has been proposed as a promising tool for addressing complex problems associated with environmental change, particularly in the context of cultural landscapes. Transhumance is not only a farming practice responsible for shaping cultural landscapes but also an adaptive strategy based on mobility that may represent a useful approach to overcoming the growing challenges posed by accelerated environmental change. A socio-cultural valuation of ecosystem services associated with the Conquense Drove Road, one of the major transhumant networks still in use in Mediterranean Spain, was conducted via the distribution of questionnaires to 416 local residents and visitors to capture their perceptions regarding the importance of 34 ecosystem services (10 provisioning, 12 regulating, and 12 cultural) for both social and personal well-being. Overall, the ecosystem services considered to be the most important for social well-being were fire prevention, air purification and livestock. Most of the ecosystem services in question were perceived as declining, with the exception of those associated with recreation, scientific knowledge and environmental education. This study revealed that perceptions regarding the value of ecosystem services differed among respondents, depending on their age, place of origin and gender. Several methodological issues, as well as the implications of socio-cultural valuation for policy making, are also discussed here. 相似文献
557.
The Bay of Palma, in Mallorca, is a leading region for beach holidays in Europe. It is based on a mass tourism model strongly modulated by seasonality and with high environmental costs. Main tourism stakeholders are currently implementing complementary activities to mitigate seasonality, regardless of climate change. But climate is—and will remain—a key resource or even a limitation for many types of tourism. Assessing the present conditions and exploring the future evolution of climate potential for these activities have become a priority in this area. To this end, the climate index for tourism (CIT)—originally designed to rate the climate resource of beach tourism—is adapted to specifically appraise cycling, cultural tourism, football, golf, motor boating, sailing and hiking. Climate resources are derived by using observed and projected daily meteorological data. Projections have been obtained from a suite of Regional Climate Models run under the A1B emissions scenario. To properly derive CITs at such local scale, we apply a statistical adjustment. Present climate potentials ratify the appropriateness of the Bay of Palma for satisfactorily practicing all the examined activities. However, optimal conditions are projected to degrade during the peak visitation period while improving in spring and autumn. That is, climate change could further exacerbate the present imbalance between the seasonal distributions of ideal climate potentials and high attendance levels. With this information at hand, policy makers and regional tourism stakeholders can respond more effectively to the great challenge of local adaptation to climate change. 相似文献
558.
Golubev AV Golubeva VN Krylov NG Kuznetsova VF Mavrin SV Aleinikov AY Hoppes WG Surano KA 《Journal of environmental radioactivity》2005,84(3):333-342
Lichens are widely used to assess the atmospheric pollution by heavy metals and radionuclides. However, few studies are available in publications on using lichens to qualitatively assess the atmospheric pollution levels. The paper presents research results applying epiphytic lichens as bio-monitors of quantitative atmospheric contamination with uranium. The observations were conducted during 2.5 years in the natural environment. Two experimental sites were used: one in the vicinity of a uranium contamination source, the other one - at a sufficient distance away to represent the background conditions. Air and lichens were sampled at both sites monthly. Epiphytic lichens Hypogimnia physodes were used as bio-indicators. Lichen samples were taken from various trees at about 1.5m from the ground. Air was sampled with filters at sampling stations. The uranium content in lichen and air samples as well as isotopic mass ratios (235)U/(238)U were measured by mass-spectrometer technique after uranium pre-extraction. Measured content of uranium were 1.45 mgkg(-1) in lichen at 2.09 E-04 microgm(-3) in air and 0.106 mgkg(-1) in lichen at 1.13 E-05 microgm(-3) in air. The relationship of the uranium content in atmosphere and that in lichens was determined, C(AIR)=exp(1.1 x C(LICHEN)-12). The possibility of separate identification of natural and man-made uranium in lichens was demonstrated in principle. 相似文献
559.
560.
Bhaskar Kumar Anurag Al-Hashimi Abdulrahman Meena Mahesh Meena Vijay Singh Langyan Sapna Shrivastava Manoj Sayyed Riyaz Zafar El-Enshasy Hesham A Almunqedhi Bandar Mohsin Ahmed Singh Renu 《Environmental science and pollution research international》2022,29(7):9792-9804
Environmental Science and Pollution Research - A large amount of ammonia volatilization from the agricultural system causes environmental problems and increases production costs. Conservation... 相似文献