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181.
de Vasconcelos Vera Mônica de Morais Elís Regina Costa Faustino Samantha Joyce Bezerra Hernandez Maria Carolina Ramirez Gaudêncio Hiara Ruth da Silva Câmara de Melo Rafael Rodolfo Bessa Junior Ambrósio Paula 《Environmental science and pollution research international》2021,28(3):2600-2607
Environmental Science and Pollution Research - Aquaculture is an activity with economic and social importance since it generates food, employment, and income. However, like other human activities,... 相似文献
182.
183.
Anne-Marie Boulay Christian Bouchard Cecile Bulle Louise Deschênes Manuele Margni 《Mitigation and Adaptation Strategies for Global Change》2002,7(4):417-418
Subject Index
Subject Index 相似文献184.
Analysis of the displacements and activity of larval stages of the terebellid polychaete Eupolymnia nebulosa were carried out on different sediment types collected in the Bay of Banyuls-sur-Mer (western Mediterranean). Results indicated sediment recognition by the larvae. Time devoted to exploration and settlement trials were significantly longer when sediments of similar granulometry had been previously reworked by adults. There were increased responses of settling larvae if the tentacles of adults of the same species had previously been in contact with the tested sediment. The early settlement activity was stronger at the sediment boundaries and increased in the coarse sediment. Our results suggest that larvae are able to recognize biologically bioturbed sediments and modify their behaviour accordingly. There is a larval settlement before the competent stage. Possible consequences of early settlement and the limitation of dispersal in Eupolymnia nebulosa larvae are discussed together with the results of automated measurements of early larval swimming.Communicated by S.A. Poulet, Roscoff 相似文献
185.
Mechanized Logging, Market Hunting, and a Bank Loan in Congo 总被引:5,自引:0,他引:5
Financing for logging of tropical moist forests in the Republic of Congo is commonly sought in the form of loans from multilateral development banks. Pressure from nongovernmental conservation organizations and from within the banks themselves has resulted in their beginning to assess the environmental consequences of such loans. We conducted one of the first such assessments of an African Development Bank loan to a logging company. Geographic isolation, resulting transportation costs, and market demands have forced commercial loggers within the Sangha region of Congo to exploit only the most valuable timber. This form of timber extraction destroys an average of 6.8% of the canopy and thus, unlike clear cutting, was expected to have a minimal impact on wildlife populations. Line transect counts showed, however, that primate abundance was exceedingly low in logged forest. We believe this is not a direct consequence of canopy reduction, but results from the extremely intensive market hunting that coincides with timber surveying and extraction. Weapons and hunting camps were common, and logging company vehicles transported primates, duikers and other game daily. Wildlife laws of Congo are openly violated and they are not enforced. While market hunting is clearly facilitated and intensified by the presence of logging concessions, it is the Congo's highly urbanized population that provides the ever growing demand for meat, a demand not being met through animal husbandry. Thus, although selective logging in the absence of hunting may have only limited adverse effects on wildlife, when the two are combined the consequences are grave for the Sangha region's wildlife. Loans to logging companies from the African Development Bank should incorporate conditions for ensuring wildlife conservation. 相似文献
186.
Andreia Garcês Isabel Pires Paula Rodrigues 《Journal of environmental science and health. Part. B》2020,55(1):75-89
AbstractIn the last decades, the use and misuse of pesticides in the agriculture have increased, having a severe impact on ecosystems and their fauna. Although the various effects of pesticides on biodiversity have been already documented in several studies, to our knowledge no consistent overview of the impact of pesticides in vertebrates, both terrestrial and aquatic, is available. In this review, we try to present a concise compilation of the teratogenic effects of pesticides on the different classes of vertebrates – mammals, birds, reptiles, amphibians and fish. 相似文献
187.
High molecular weight materials (HMWM, >12000-14000 Da) excreted by the two cyanophyte species (Microcystis aeruginosa and Anabaena spiroides) and a diatom (Aulacoseira granulata) which are dominant phytoplankton species in a eutrophic reservoir, Barra Bonita, Brazil were investigated as copper (Cu) and cadmium (Cd) complexation agents and their monosaccharide and elemental analysis of C, H, N and S determined. Also, HMWM obtained from the reservoir water as well as from a mixture of the three algae materials were studied. The HMWM of the cyanophytes and the mixture of the three algae materials complexed Cu and Cd, whereas the HMWM of the diatom and that from the reservoir water complexed only Cu. Two classes of ligands of intermediate to weak binding strength were obtained after Scatchard plot analysis of the titration data. The cyanophytes and the mixture HMWM presented higher conditional stability constants for Cu class-1 ligands (logK1' = 9.2-9.5) than the HMWM derived from the diatom and the reservoir water (logK1' = 8.6-8.8). Higher proportions of acidic monosaccharides corresponded to higher K1' of Cu and Cd complexation, yet no relation was observed among complexation parameters and elemental analysis. This study points out Cu ligands of intermediate to weak binding strength in the excreted HMWM of dominant microalgae and in the HMWM of the reservoir water, while Cd was solely complexed by ligands isolated from the cyanophyte HMWM. 相似文献
188.
Olivier Maire Jean Claude Duchêne Jean Michel Amouroux Antoine Grémare 《Marine Biology》2007,151(2):737-749
The activity and surface sediment displacement by the terebellid polychaete Eupolymnia nebulosa were monitored, using new image acquisition and image analysis procedures. We used a video sensor mounted on a motorized
table, to acquire adjacent images of the whole studied aquarium within about 2 s. These images were then grouped within a
composite image acquired every 15 s. Consecutive composite images were compared to infer activity and surface sediment displacement.
This procedure proved efficient for E. nebulosa as indicated by (1) the continuity of the tentacles within composite images, and (2) the direct comparison of images and
detected activities. There were important temporal changes in the relative importance of the three main types of activity:
feeding, tube-building and (both partial and total) emergence from the tube, accounting, respectively, for 75, 15 and 10%
of the entire experiment duration. Activity intensity (cm2 min-1) was assessed through the surface of pixels with grey levels differing by more than 20 (on a 0–255 scale) between two consecutive
images. Feeding was associated with low activity intensity, whereas tube-building and emergence from the tubes were associated
with high activity intensities. Surface sediment displacement mostly resulted from tentacle activity both during feeding and
tube-building and was almost zero when worms emerged from their tube. We used our experimental set up to assess spatial changes
in activity intensity and particle displacements along the tentacles. Most of the activity occurred within the first 4–6 cm
from the tube aperture. Particle loss during their transfer along the tentacles preferentially affected larger particles as
postulated by the model of particle selection and transport in tentaculate deposit-feeders. Moreover, the speed of the particles
along the tentacles correlated negatively with their size. This contributed to increase in the residence time of larger particles
on the tentacles and thus, to further enhance their probability of being lost. The size distributions of particles during
feeding and tube-building did not differ significantly although visual observations confirmed the preferential use of larger
particles for tube-building. This suggests the existence of a sorting step occurring elsewhere than on the tentacles as already
demonstrated for spionid polychaetes. 相似文献
189.
Conte Yves Le Sreng Leam Sacher Nelly Trouiller Jérôme Dusticier Georges Poitout Serge Henri 《Chemoecology》1994,5(1):6-12
Summary Honey bee workers are able to nurse or to destroy and thus to recognize the capped queen cells containing a pupa. Fatty acid esters, especially methyl oleate, methyl palmitate and ethyl oleate were found in significant amounts on the queen pupal cuticle. Methyl oleate, the major component, along with smaller amounts of methyl linoleate and methyl linolenate, were involved in the recognition of queen cells by workers. In natural conditions of the colony, queen cells containing a paraffin pupal lure with methyl oleate were accepted 5.9 days by workers, releasing about 1.8 queen pupa equivalents during that period, when control cells (without ester) were kept only 2.1 days. Although these esters are non specific to honey bees, they are of great importance in social regulation of the honey bee colony. 相似文献
190.
Takam Brice Acayanka Elie Kamgang Georges Y. Pedekwang Merlin T. Laminsi Samuel 《Environmental science and pollution research international》2017,24(20):16958-16970
Environmental Science and Pollution Research - Removal of cationic dye, Azur II, and anionic dye, Reactive Red 2 (RR-2) from aqueous solutions, has been successfully achieved by using a modified... 相似文献