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91.
Anni H?m?l?inen Rauno V. Alatalo Christophe Lebigre Heli Siitari Carl D. Soulsbury 《Behavioral ecology and sociobiology》2012,66(12):1577-1586
Fighting is a fundamental determinant of male fitness in species where females prefer socially dominant males as mates or where dominants can prevent subordinates from mating. This in turn can lead to the evolution of honest inter- and intra-sexual cues of male dominance. Fighting as a behaviour comprises both fighting rate (number of fights per unit of time) and fighting performance (success in winning fights), but it is not always clear which of these components are important for female choice and how they link to signals of male quality. To quantify the relative importance of fighting as a cue for females, we recorded detailed behavioural data from male black grouse Tetrao tetrix at leks. We explored the relationship between phenotypic traits (body mass, eye comb size, tail (lyre) length and blue chroma colouration) and fighting performance and rates and how these were related to male mating success. In older males' pairwise fights, winners had lower blue chroma than losers, but there were no differences in other morphological traits. In yearlings, no morphological trait predicted success in pairwise contests. Both fighting rate and performance were positively related to the number of copulations acquired by a male; however, when controlled for lek centrality, fighting performance and not fighting rate was significantly related to mating success. Our results indicate that females may be using components of fighting behaviour as cues for mate choice. 相似文献
92.
In order to simulate a simple entraining geophysical flow, a viscous Newtonian gravity current is released from a reservoir by a dam-break and flows along a rigid horizontal bed until it meets a layer of entrainable material of finite depth, identical to the current. The goal is to examine the entrainment mechanisms by observing the interaction between the incoming flow and the loose bed. The sole parameter varied is the initial volume of the gravity current, thus altering its height and velocity. The gravity current plunges or spills into the entrainable bed and the velocity of the flow front becomes linear with time. The bed material is directly affected: motion is generated in the fluid far downstream of, and in that lying beneath the encroaching front. Shear bands are identified, separating horizontal flow downstream from flow with a strong vertical component close to the step. Downstream of the step the flow is horizontal and stratified, with no slip on the bottom boundary and very low shear near the surface. Between these two regions may lie transitional zones with linear velocity profiles, separated by horizontal bands of high shear; the number of transitional zones in the cross-section varies with the initial volume of the dam-break. 相似文献
93.
Hussain Tassaddaq Bakouch Hassan S. Chesneau Christophe 《Environmental and Ecological Statistics》2019,26(2):127-151
Environmental and Ecological Statistics - Because of the dramatic changes that are being observed in the climatic conditions of the world, such as excess of rains, drought and huge floods, we... 相似文献
94.
Since the 1960s, the development of the Serre-Chevalier winter and summer resort has led to a rapid extension of the urban fabric on the territory of the village of St-Chaffrey. On July 9, 1981, the new neighborhoods built on the alluvial fan of the Verdarel torrent were partly devastated by a channeled debris flow. This disaster prompted the civil authorities to set up an extensive fluvial regulation system, which rapidly contributed to recreating a climate of confidence and security favorable to continuing urban expansion. The combination of catastrophic floods in July 1995, and a new security-oriented national policy on natural hazards, nevertheless led to a return to precautionary measures. The St-Chaffrey town council has therefore been forced by the State to accept a building-free zone on the land-use plan. This measure is perceived as a real denial of the local efficacy of the flood and landslide risk management policy as carried out by the council of St-Chaffrey during the previous 20 years. 相似文献
95.
Seasonal variations of heavy metals in central Greenland snow deposited from 1991 to 1995 总被引:1,自引:0,他引:1
Barbante C Boutron C Morel C Ferrari C Jaffrezo JL Cozzi G Gaspari V Cescon P 《Journal of environmental monitoring : JEM》2003,5(2):328-335
To better assess the seasonality in the fallout of heavy metals to central Greenland, a continuous series of 68 snow samples has been collected at a remote site in the Summit area from a 2.7 m pit using ultraclean sampling procedures. This covers a continuous four year time period from spring 1991 to spring 1995. Co, Cu, Zn, Mo, Rh, Pd, Ag, Cd, Sb, Pt, Pb, Bi and U were determined using ultrasensitive inductively coupled plasma sector field mass spectrometry under clean room conditions. In addition we also determined Al by graphite furnace atomic absorption spectrometry and Na+, Ca2+, SO4(2-), MSA and oxalate by ion chromatography, species that will assist in the interpretation of the trace metal data. The data show pronounced inter- and intra-annual variations, with large differences in the amplitude of these variations for the element studied, with few clear seasonality patterns. Generally, high concentrations are observed in the spring snow layers, while much lower concentrations are typical of summer snow layers. Significant correlations are observed between Co, Cu, Zn, Ag and Sb, while Pt, Pd and Rh show no correlation with the other metals. Crustal enrichment factors show that while the crustal dust contribution is probably important for some metals for part of the year (spring), anthropogenic inputs are as important in many instances. Pronounced intra-annual variations are observed for some metals, in particular Pt. The variations observed for this metal parallel fairly closely changes in Russian Pt production, which points to emissions from smelters in the Russian Arctic as likely sources for Pt. 相似文献
96.
Ingibjörg G. Jónsdóttir Guðrún Marteinsdóttir Christophe Pampoulie 《Marine Biology》2008,154(5):867-874
Growth and condition (both somatic and hepatosomatic index) of Atlantic cod spawning at different locations around Iceland
was studied in relation to the Pan I locus. South of Iceland cod carrying the Pan IAB and Pan IBB genotypes were more frequent while cod carrying the Pan IAA genotype was more frequent north of Iceland. Differences in growth were detected between cod spawning at different areas
around Iceland. Cod spawning south of Iceland grew faster than cod spawning north of Iceland. Differences in growth rate were
also observed among cod carrying different Pan I genotypes within a spawning area. The least frequent Pan I genotype expressed the highest growth in both south and north of Iceland. Cod carrying the Pan IAA grew fastest at spawning locations south of Iceland, while cod carrying the Pan IBB genotype grew fastest in north of Iceland. A consistent relationship between condition and the different Pan I genotypes was also observed in all the areas. Cod carrying the Pan IAA expressed the highest somatic condition and the lowest hepatosomatic index. Together, these results indicate that the relation
of growth and condition with the Pan I locus is more complicated than earlier thought and is likely to be influenced by other factors, like size-selective fishing
and food supply. 相似文献
97.
The study of sexual segregation has received increasing attention over the last two decades. Several hypotheses have been proposed to explain the existence of sexual segregation, such as the "predation risk hypothesis," the "forage selection hypothesis," and the "activity budget hypothesis." Testing which hypothesis drives sexual segregation is hampered, however, by the lack of consensus regarding a formal measurement of sexual segregation. By using a derivation of the well-known chi-square (here called the sexual segregation and aggregation statistic [SSAS]) instead of existent segregation coefficients, we offer a reliable way to test for temporal variation in the occurrence of sexual segregation and aggregation, even in cases where a large proportion of animals are observed alone. A randomization procedure provides a test for the null hypothesis of independence of the distributions of males and females among the groups. The usefulness of SSAS in the study of sexual segregation is demonstrated with three case studies on ungulate populations belonging to species with contrasting life histories and annual grouping patterns (isard, red deer, and roe deer). The existent segregation coefficients were unreliable since, for a given value, sexual segregation could or could not occur. Similarly, the existent segregation coefficients performed badly when males and females aggregated. The new SSAS was not prone to such limitations and allowed clear conclusions regarding whether males and females segregate, aggregate, or simply mix at random applicable to all species. 相似文献
98.
Pelfrêne Aurélie Sahmer Karin Waterlot Christophe Douay Francis 《Environmental science and pollution research international》2019,26(20):20107-20120
Environmental Science and Pollution Research - Although growing vegetables in urban gardens has several benefits, some questions in relation with the safety of foods remain when the self-production... 相似文献
99.
Monitoring Changes in Freshwater Macroinvertebrate Communities Along a Salinity Gradient Using Artificial Substrates 总被引:1,自引:0,他引:1
Scientists strive to develop efficient sampling protocols, reducing both the number of samples and processing time required,
which can be adapted for use in a broad range of ecosystems. We investigated the accuracy and usefulness of artificial substrates
in monitoring the impact of rising salinity on freshwater macroinvertebrate communities. We sampled seven sites along a salinity
gradient (from 0.2gL-1 to 2.6gL-1) over a 19-km stretch of the Meurthe River, in northeastern France. All other parameters remained stable in this section
of the river. Artificial substrate samples, each consisting of six liters of pebbles, were removed from the river at one-month
intervals and examined. Results obtained indicated the same qualitative impairments as those found in samples collected using
a Surber net. The use of artificial substrates was found to be a viable alternative method for assessing biological changes
in river quality due to increasing salinity disturbance when Surber sampling cannot be performed. 相似文献
100.
Lopareva-Pohu A Verdin A Garçon G Lounès-Hadj Sahraoui A Pourrut B Debiane D Waterlot C Laruelle F Bidar G Douay F Shirali P 《Environmental pollution (Barking, Essex : 1987)》2011,159(6):1721-1729
Due to anthropogenic activities, large extends of soils are highly contaminated by Metal Trace Element (MTE). Aided phytostabilisation aims to establish a vegetation cover in order to promote in situ immobilisation of trace elements by combining the use of metal-tolerant plants and inexpensive mineral or organic soil amendments. Eight years after Coal Fly Ash (CFA) soil amendment, MTE bioavailability and uptake by two plants, Lolium perenne and Trifolium repens, were evaluated, as some biological markers reflecting physiological stress. Results showed that the two plant species under study were suitable to reduce the mobility and the availability of these elements. Moreover, the plant growth was better on CFA amended MTE-contaminated soils, and the plant sensitivity to MTE-induced physiological stress, as studied through photosynthetic pigment contents and oxidative damage was lower or similar. In conclusion, these results supported the usefulness of aided phytostabilisation of MTE-highly contaminated soils. 相似文献