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تعداد نتایج: 10705709 فیلتر نتایج به سال:
Thermokarst lakes are formed as a result of thawing ice-rich permafrost, transforming vast permafrost soil into lake sediment and changing the biogeochemistry carbon (C), nitrogen (N), phosphorus (P). Degraded thermokarst two distinct fates pristine in processes. However, we do not clearly understand differences relationships between degraded from stoichiometric perspective. In this study, 44 a...
This study considers the importance of lake trout habitat as a factor determining persistent organochlorine (OC) concentration. Lake trout is a stenothermal, cold water species and sensitive to hypoxia. Thus, factors such as lake depth, thermal stratification, and phosphorus enrichment may determine not only which lakes can support lake trout but may also influence among-lake variability in lak...
Phytoplankton groups have specific role in the water quality of Neor Lake for living of fishes in Ardabil province. So, in order to study water quality and fish stocks assessment of Neor Lake after entering Carassius gibelio, primary products of this lake at first should be evaluated.This investigation carried out in 5 stations and 8 months during 2014. Phytoplankton sampled by 1 liter Ruttner...
The causes of lakeshore deterioration and reed decline are concisely summarised, and demonstrated with examples of seven Central European lakes (Germany: Havellakes, Lake Constance-Untersee, Lake Constance-Obersee; Switzerland: Lake Zurich, Lake Biel, Lake Neuchiitel, Lake Geneva). The main causes are assumed to be bank erosion, lake eutrophication, mechanical damage to the reeds, and recreatio...
the lake of urmia, with the length of 128-144km. and the width of 36.8- 50km., is located in north west of iran at the longitude of 38o ,20' and the latitude of 45 ,10. its area is about 6000km .and the average depth of water is about 6 meters reaching to 16 meters at some points. physical and chemical studies made, show that the water of the lake is colorless and has salty taste. its ph i...
iv abstract this study examined the linguistic behaviors of two iranian efl teachers each of them teaching learners of two similar proficiency levels, a beginner level and an intermediate level, to investigate the relationship between the learners proficiency levels and the amounts and purposes for l1 use by the two teachers. the study was carried out to investigate whether there were differe...
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