全文获取类型
收费全文 | 6610篇 |
免费 | 47篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 139篇 |
废物处理 | 273篇 |
环保管理 | 561篇 |
综合类 | 981篇 |
基础理论 | 1379篇 |
环境理论 | 3篇 |
污染及防治 | 1615篇 |
评价与监测 | 543篇 |
社会与环境 | 1167篇 |
灾害及防治 | 29篇 |
出版年
2022年 | 69篇 |
2021年 | 87篇 |
2020年 | 41篇 |
2019年 | 57篇 |
2018年 | 121篇 |
2017年 | 140篇 |
2016年 | 170篇 |
2015年 | 110篇 |
2014年 | 224篇 |
2013年 | 540篇 |
2012年 | 245篇 |
2011年 | 290篇 |
2010年 | 232篇 |
2009年 | 267篇 |
2008年 | 317篇 |
2007年 | 352篇 |
2006年 | 279篇 |
2005年 | 268篇 |
2004年 | 247篇 |
2003年 | 227篇 |
2002年 | 212篇 |
2001年 | 247篇 |
2000年 | 199篇 |
1999年 | 90篇 |
1998年 | 67篇 |
1997年 | 74篇 |
1996年 | 61篇 |
1995年 | 81篇 |
1994年 | 66篇 |
1993年 | 56篇 |
1992年 | 57篇 |
1991年 | 59篇 |
1990年 | 71篇 |
1989年 | 54篇 |
1988年 | 42篇 |
1987年 | 38篇 |
1986年 | 46篇 |
1985年 | 46篇 |
1984年 | 51篇 |
1983年 | 36篇 |
1982年 | 46篇 |
1981年 | 36篇 |
1980年 | 44篇 |
1979年 | 44篇 |
1975年 | 30篇 |
1974年 | 30篇 |
1973年 | 33篇 |
1972年 | 39篇 |
1971年 | 30篇 |
1969年 | 31篇 |
排序方式: 共有6690条查询结果,搜索用时 0 毫秒
211.
van Wezel AP Morinière V Emke E ter Laak T Hogenboom AC 《Environment international》2011,37(6):1063-1067
The application of engineered nanomaterials increases strongly. Development of analytical techniques and their application to environmental samples is essential for human and environmental risk assessment of the nanoparticles. The objective of this study was to develop a sensitive analytical method to quantify nC(60) in water, using accurate mass screening liquid chromatography-hybrid linear ion trap Orbitrap mass spectrometry. nC(60) can be transformed by oxidation, reduction and photochemical reaction. Therefore, the formation of some transformation products of nC(60) was studied as well. Finally, the developed analytical method was applied to surface water samples from several locations in the Netherlands. The developed method enabled to detect and quantify aqueous concentrations of the summed nC(60) and its transformation products as low as 5 ng/L. It was observed that nC(60) transformation products exceed quantities of the parent C(60). Despite the high sensitivity of the developed method, no nC(60) or transformation products were detected in an array of Dutch surface waters. This might be due to low emissions, losses in the aqueous phase by sedimentation, sorption or further transformation processes. 相似文献
212.
213.
214.
215.
Behavioral adaptations of ant species were studied in associations of different biotopes in the Crimean Mountains. The pattern
of an association was found to depend on the mode of the territorial behavior of dominant species, irrespective of their number.
The dominance hierarchy was more strict in monodominant than in bidominant associations. Ant species demonstrated different
behavioral strategies, plasticity of foraging, and avoidance of aggressive encounters. A method for formalizing interspecies
relationships and a model describing stochastic properties of the biological system are proposed, which can be useful in solving
various ethological and ecological problems. 相似文献
216.
This study was conducted in the Swedish sub-Arctic, near Abisko, in order to assess the direction and scale of possible vegetation
changes in the alpine–birch forest ecotone. We have re-surveyed shrub, tree and vegetation data at 549 plots grouped into
61 clusters. The plots were originally surveyed in 1997 and re-surveyed in 2010. Our study is unique for the area as we have
quantitatively estimated a 19% increase in tree biomass mainly within the existing birch forest. We also found significant
increases in the cover of two vegetation types—“birch forest-heath with mosses” and “meadow with low herbs”, while the cover
of snowbed vegetation decreased significantly. The vegetation changes might be caused by climate, herbivory and past human
impact but irrespective of the causes, the observed transition of the vegetation will have substantial effects on the mountain
ecosystems. 相似文献
217.
Anthropogenic effects such as contamination affect the genetic structure of populations. This study examined the temporal and geographical patterns of genetic diversity among populations of the benthic crustacean amphipod Melita plumulosa in the Parramatta River (Sydney, Australia), following an industrial chemical spill. The spill of an acrylate/methacrylate co-polymer in naphtha solvent occurred in July 2006. M. plumulosa were sampled temporally between December 2006 and November 2009 and spatially in November 2009. Genetic variation was examined at the mitochondrial cytochrome c oxidase subunit I locus. Notably, nucleotide diversity was low and Tajima’s D was significantly negative amongst amphipods collected immediately downstream from the spill for 10 months. We hypothesize that the spill had a significant localized effect on the genetic diversity of M. plumulosa. Alternate explanations include an alternate and unknown toxicant or a localized sampling bias. Future proposed studies will dissect these alternatives. 相似文献
218.
Otones V Álvarez-Ayuso E García-Sánchez A Santa Regina I Murciego A 《Environmental pollution (Barking, Essex : 1987)》2011,159(10):2637-2647
A mining area affected by the abandoned exploitation of an arsenical tungsten deposit was studied in order to assess its arsenic pollution level and the feasibility of native plants for being used in phytoremediation approaches. Soil and plant samples were collected at different distances from the polluting sources and analysed for their As content and distribution. Critical soil total concentrations of As were found, with values in the range 70-5330 mg kg−1 in the uppermost layer. The plant community develops As tolerance by exclusion strategies. Of the plant species growing in the most polluted site, the shrubs Salix atrocinerea Brot. and Genista scorpius (L.) DC. exhibit the lowest bioaccumulation factor (BF) values for their aerial parts, suggesting their suitability to be used with revegetation purposes. The species Scirpus holoschoenus L. highlights for its important potential to stabilise As at root level, accumulating As contents up to 3164 mg kg−1. 相似文献
219.
Choung CB Hyne RV Mann RM Stevens MM Hose GC 《Environmental pollution (Barking, Essex : 1987)》2011,159(10):2648-2655
To examine the link between corn agriculture and the observed decline of the endangered southern bell frog (SBF), the effects of two corn crop pesticides on larval growth and development were investigated. Tadpoles were exposed to terbufos sulfone (10 μg/L), a major breakdown product of the insecticide terbufos, and the herbicide atrazine (25 μg/L) individually and as a mixture until the completion of metamorphosis. Atrazine did not interact synergistically with terbufos sulfone or result in significant effects on growth and development alone, although there was some indication of accelerated metamorphosis in the pilot study. Terbufos sulfone alone and as a mixture (terbufos/atrazine) significantly slowed larval development and ultimately delayed metamorphosis. The observed developmental effects from an environmentally relevant concentration of terbufos sulfone indicates a risk posed by this persistent degradation product to the endangered SBF, which breeds and develops in the rice bays adjacent to corn fields treated with pesticides. 相似文献
220.
Kabra AN Khandare RV Kurade MB Govindwar SP 《Environmental science and pollution research international》2011,18(8):1360-1373