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排序方式: 共有773条查询结果,搜索用时 15 毫秒
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Antić-Mladenović Svetlana Kresović Mirjana Čakmak Dragan Perović Veljko Saljnikov Elmira Ličina Vlado Rinklebe Jörg 《Environmental geochemistry and health》2019,41(1):249-266
Environmental Geochemistry and Health - Extreme flooding in May, 2014 affected the sub-catchments of six major rivers in Serbia. The goal of the study was to evaluate the contents of potentially... 相似文献
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The Strait of Otranto is the connection between the Adriatic and Ionian Seas. Low nutrient concentrations, high transparency, and low phytoplankton cell density and biomass reflect the oligotrophic character of the area. Enrichment of the euphotic layer with nutrients is mainly due to discharge of Albanian and Greek rivers, as well as mixing and upwelling in winter/early spring. Following phytoplankton bloom in April, a progressive decrease of phytoplankton cell density is due to the consumption of nutrients throughout the proceeding summer and autumn. Nitrogen was a strong limiting factor for phytoplankton growth in summer. Deep biomass maxima were detected in the 50 to 100 m layer and corresponded mostly to cells smaller than 20 m. The eastern part of the strait is mostly influenced by the northerly inflowing current from the Ionian Sea, and the western part by the southerly outflowing current from the Adriatic Sea. This typical circulation could be disturbed by inertial oscillations in the current field, generated by the strong oscillating winds and cyclonic eddies. The type of circulation determined the distribution of thermohaline characteristics, abundance, biomass, as well as taxonomic composition of phytoplankton, across the strait. Ecological characteristics of the water masses on two sides of the strait were significantly different during the formation of a longitudinal thermohaline front in May 1990. 相似文献
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Temporal fluctuations of species composition and abundance of fish juveniles in the National Park Kornati were studied over
12 months from January to December 1992. A total of 40 168 individuals, representing 24 families and 69 species, were collected
using a 50 m long beach seine. The community was dominated numerically by a few species: Atherina hepsetus (45.90%), Sarpa salpa (21.21%), Diplodus vulgaris (10.49%), and Symphodus ocellatus (6.98%), constituting over 84.58% of the total catch. Similarity between patterns in the abundance of the 17 most common
species were examined using correlation matrix-based principal component analysis. Results were compared to the abiotic factors
leading to the conclusion that only a low amount of variation in the abundance field can be explained by temperature, salinity
and dissolved oxygen.
Received: 23 March 1997 / Accepted: 11 April 1997 相似文献
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作者对西岭凤地山锡矿床的成矿地质条件,特别是火山构造、岩浆演化与成矿的关系进行了研究,认为:西岭锡矿是一个与火山侵出相碎斑熔岩时、空、成因关系密切的次火山热液脉状锡矿床。根据西岭锡矿的地质环境和成矿物理化学条件、矿质、水介质来源建立了理想的成矿模式。进而指出粤东斑岩锡矿的远景。西岭锡矿类型的确定,对粤东和赣南火山岩地区锡矿普查具有重要意义。 相似文献
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Vrchotová N Tríska J Urban O Peknic L 《Environmental pollution (Barking, Essex : 1987)》2004,131(1):55-59
The amount of catechin and 4-hydroxyacetophenone in the methanolic extract of the Norway spruce needles at the locality Bíly Kríz (Moravian-Silesian Beskydy Mts.) was found in the range 2.8-12.1 mg g(-1) (dry weight) and 0.2-17.7 mg g(-1) (dry weight), respectively. Total amount of catechin (sum of the last three needle year-classes) is statistically higher (p<0.01) in the sparse areas compared to the dense ones and similar trends were recorded for catechin content in current and one-year-old needles. These results may support an idea about primary control of phenolic production by the incident solar radiation, which depends on the social position of the tree and canopy closure degree. 相似文献
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Unkasević M Vukmirović Z Tosić I Lazić L 《Environmental science and pollution research international》2003,10(2):89-97
This study has shown theoretical, observed and experimental evidence of pollutants released, transported and deposited during the Kosovo conflict in 1999 and their effects on precipitation in Serbia. The greatest bombardment of the chemical industry, oil refineries and fuel storage in Serbia which occurred during April, resulted in releases of many hazardous, toxic and cancerogenic substances. The number of April's days with precipitation greater or equal to 0.1 mm in 1999 are compared to those in the period from 1961 to 1990 registered at thirty meteorological stations in Serbia and especially at the Belgrade-Observatory station in the period from 1888 to 1995. The maximums of days with precipitation greater or equal to 0.1 mm were at the wider Belgrade area and at the central and southwestern parts of Serbia during April 1999. This is confirmed by using the Eta trajectory analysis. 相似文献