全文获取类型
收费全文 | 606篇 |
免费 | 12篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 27篇 |
废物处理 | 24篇 |
环保管理 | 140篇 |
综合类 | 48篇 |
基础理论 | 150篇 |
环境理论 | 1篇 |
污染及防治 | 132篇 |
评价与监测 | 65篇 |
社会与环境 | 24篇 |
灾害及防治 | 15篇 |
出版年
2023年 | 5篇 |
2022年 | 5篇 |
2021年 | 8篇 |
2020年 | 9篇 |
2019年 | 4篇 |
2018年 | 15篇 |
2017年 | 14篇 |
2016年 | 17篇 |
2015年 | 9篇 |
2014年 | 27篇 |
2013年 | 41篇 |
2012年 | 25篇 |
2011年 | 35篇 |
2010年 | 33篇 |
2009年 | 26篇 |
2008年 | 38篇 |
2007年 | 33篇 |
2006年 | 38篇 |
2005年 | 25篇 |
2004年 | 16篇 |
2003年 | 27篇 |
2002年 | 20篇 |
2001年 | 10篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 13篇 |
1997年 | 8篇 |
1996年 | 12篇 |
1995年 | 10篇 |
1994年 | 15篇 |
1993年 | 9篇 |
1992年 | 3篇 |
1991年 | 8篇 |
1990年 | 2篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1980年 | 2篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有626条查询结果,搜索用时 31 毫秒
561.
562.
van Putten E. Ingrid Pinkard Elizabeth O’Grady Anthony Schmidt Rebecca K. Cresswell Ian Raoult Vincent Taylor Matt D. 《The Environmentalist》2021,41(4):541-555
Environment Systems and Decisions - Globally we are experiencing a decline in aggregate natural capital. Many primary industries and enterprises are highly dependent on renewable and non-renewable... 相似文献
563.
Kebede Nigussie Mekonnen Abayneh Ataro Ambushe Mesfin Redi Abshiro Robert Ian McCrindle 《毒物与环境化学》2013,95(10):1980-1994
A total of thirty three water samples were collected from Tinishu Akaki River, Lake Awassa, and Lake Ziway, Ethiopia. Multi-element determination of trace elements (V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Se, Ag, Cd, Sn, Hg, and Pb) in water samples was carried out by inductively coupled plasma-mass spectrometry after acidification with 1% HNO3. The concentration (in µg?L?1) of the elements were in the range of 1.0–19, <0.42–83, 1.1–1580, <45–1760, <0.11–2.0, 0.43–13, 0.77–13, 6–300, <0.94–2.0, <0.3–1.5, <0.012–0.63, 0.13–4.8, <0.29, and 0.2–7.2 for V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Se, Ag, Cd, Sn, Hg, and Pb, respectively. The concentrations of all the quantified elements, with the exception of Mn, were in the range of the permissible limits of the Ethiopian, European Community, and World Health Organization for both drinking water quality guidelines and irrigation water guidelines. The accuracy of the method was validated by analyzing trace elements in water standard reference material (SRM 1643e). The measured values of trace elements in the SRM agreed well with the certified values at the 95% confidence level. 相似文献
564.
Kebede Nigussie Mekonnen Abayneh Ataro Ambushe Mesfin Redi Abshiro Robert Ian McCrindle Nikolay Panichev 《毒物与环境化学》2013,95(9):1678-1687
Sediment samples were collected from Tinishu Akaki River (TAR), Lake Awassa, and Lake Ziway, Ethiopia for determination of mercury. The air-dried samples were analyzed for mercury with a differential atomic absorption spectrometer after thermal evaporation of bound mercury converting it to its atomic form. Certified reference materials (CRMs) of sediments and soils were used to validate the method. The recovery of mercury from CRMs and sediments was in the range of 95–100%. The limit of detection for the determination of mercury was 50?ng?kg?1. The concentration of total mercury in the sediments varied from 3.9 to 110?µg?kg?1 for TAR, 14 to 67?µg?kg?1 for Lake Awassa, and 17 to 110?µg?kg?1 for Lake Ziway. It was found that the total mercury concentrations in all samples were below the United States Environmental Protection Agency guideline of 200?µg?kg?1. 相似文献
565.
Ian Moffatt 《国际发展与全球生态学杂志》2013,20(4):242-250
Seven measures of sustainable development for Scotland are examined for the period 1980-1993. These measures are green net national product, genuine savings, ecological footprint, environmental space, human appropriation of net primary production, the index of sustainable economic welfare and the genuine progress indicator. Very different messages concerning sustainable development in Scotland emerge from these measures. 相似文献
566.
Ian Moffatt 《国际发展与全球生态学杂志》2013,20(2):131-150
This paper discusses some of the potentials, problems, policies and progress in modelling sustainable development. After briefly describing ten approaches to modelling sustainable development, some of the methodological problems still to be resolved are addressed. It is then suggested that policies to promote sustainable development should operate at six different spatial levels connecting global, multinational, national, regional, local and individual. Attempting to model sustainable development in such a hierarchical manner is exceedingly difficult. One way of modelling sustainable development is to develop the concept of a sustainable corridor, combining ecological, economic and equity considerations in a hierarchical fashion and through space-time. A preliminary dynamic, hierarchical model is described connecting global and national patterns of development. Using global and national data for Scotland, the calibrated model, running under the business-as-usual scenario, shows that current development paths are unsustainable. It is shown that, by implementing a judicious choice of policies, a sustainable corridor for a global and a national system can be achieved. The ways in which this preliminary model can be developed to connect all six hierarchical levels are discussed. 相似文献
567.
Plant growth rates and seed size: a re-evaluation 总被引:1,自引:0,他引:1
Turnbull LA Philipson CD Purves DW Atkinson RL Cunniff J Goodenough A Hautier Y Houghton J Marthews TR Osborne CP Paul-Victor C Rose KE Saner P Taylor SH Woodward FI Hector A Rees M 《Ecology》2012,93(6):1283-1289
Small-seeded plant species are often reported to have high relative growth rate or RGR. However, because RGR declines as plants grow larger, small-seeded species could achieve higher RGR simply by virtue of their small size. In contrast, size-standardized growth rate or SGR factors out these size effects. Differences in SGR can thus only be due to differences in morphology, allocation, or physiology. We used nonlinear regression to calculate SGR for comparison with RGR for 10 groups of species spanning a wide range of life forms. We found that RGR was negatively correlated with seed mass in nearly all groups, but the relationship between SGR and seed mass was highly variable. We conclude that small-seeded species only sometimes possess additional adaptations for rapid growth over and above their general size advantage. 相似文献
568.
569.
Jannika E. Boström Thord Fransson Ian Henshaw Sven Jakobsson Cecilia Kullberg Susanne Åkesson 《Behavioral ecology and sociobiology》2010,64(11):1725-1732
Recent experiments exposing migratory birds to altered magnetic fields simulating geographical displacements have shown that
the geomagnetic field acts as an external cue affecting migratory fuelling behaviour. This is the first study investigating
fuel deposition in relation to geomagnetic cues in long-distance migrants using the western passage of the Mediterranean region.
Juvenile wheatears (Oenanthe oenanthe) were exposed to a magnetically simulated autumn migration from southern Sweden to West Africa. Birds displaced parallel
to the west of their natural migration route, simulating an unnatural flight over the Atlantic Ocean, increased their fuel
deposition compared to birds experiencing a simulated migration along the natural route. These birds, on the other hand, showed
relatively low fuel loads in agreement with earlier data on wheatears trapped during stopover. The experimental displacement
to the west, corresponding to novel sites in the Atlantic Ocean, led to a simulated longer distance to the wintering area,
probably explaining the observed larger fuel loads. Our data verify previous results suggesting that migratory birds use geomagnetic
cues for fuelling decisions and, for the first time, show that birds, on their first migration, can use geomagnetic cues to
compensate for a displacement outside their normal migratory route, by adjusting fuel deposition. 相似文献
570.
The probability of prey encounter, attack, capture, and kill are often hypothesized to depend on habitat structure, but field evidence in terrestrial systems is rare. We tested whether predation efficiency by the American marten (Martes americana) and fear of predation by their primary prey, the red-backed vole (Clethrionomys gapperi), differed between 20- to 50-year-old regenerating forest stands and older uncut stands. Our results showed that the frequency of prey encounter, prey attack, and prey kill were higher in old uncut forests, despite the fact that small-mammal density was similar to that in younger logged forests. These differences in predation efficiency were linked to higher abundance of coarse woody debris, which seems to offer sensory cues to martens, thereby increasing the odds of hunting success. Red-backed voles in regenerating forest stands exhibited increased wariness compared to voles living in old uncut forest, suggestive of a behavioral response to habitat-mediated variation in predation risk. 相似文献