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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Spatial and temporal variations of sedimentation rate in the Timah Tasoh Water Reservoir, Perlis, Malaysia

100%
Rahaman Z. A., Ismail W. R.
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
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2010
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tom 42
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nr 1
127-138
Human activities such as logging, land conservation, road construction and other disturbances in watersheds will increase erosion rate and thus the amount of sediment transported into the river that reaches lakes, reservoirs and sea. Accelerated sedimentation rate in the reservoir can signifi cantly reduce a reservoir’s surface area, eliminating wetland area surrounding the reservoir and shallow the areas near the shore of the reservoir. A study of sedimentation rate in the Timah Tasoh water reservoir was carried out from May 2001 to April 2002 by means of sediment traps. The aim of this study is to determine the spatial and temporal pattern of sedimentation rates in the reservoir. The sediment traps were installed at five different locations in the reservoir and replaced every month. Gross sedimentation rates measured in the sediment traps vary from about an average of 1.4 kg/m2/month or 16.3 kg/m2/yr in the deepest part of the reservoir to about 79.2 kg/m2/yr (monthly average of 6.6 kg/m2/month) and 47.1 kg/m2/yr (monthly average of 3.9 kg/m2/month) near the inlet of the Pelarit River and the Tasoh River respectively. The sedimentation rate near the Pelarit River and the Tasoh River inflow is correlated with the water and suspended sediment discharge in the river, owing to its proximity to the rivers and the fl ooding effect, mainly during the wet season. The sedimentation rate decreases southward along the reservoir, as a result of increasing distance from the river mouth. The total suspended sediment load of the Upper Pelarit River and the Jarum River flowing into the reservoir is 11.4 × 103 ton/year and 5.41 × 103 ton/ /year respectively.
2

Temporal analysis of the genetic diversity in a honey bee mating area of an island population (La Palma, Canary Islands, Spain)

100%
Munoz I., De la Rua P.
Journal of Apicultural Science
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2012
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tom 56
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nr 1
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Longwave radiation budget at the Baltic Sea surface from satellite and atmospheric model data

100%
Zapadka T., Krezel A., Wozniak B.
Oceanologia
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2008
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tom 50
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nr 2
147-166
The net longwave radiation flux LW↑↓ in the Baltic Sea in 2001 has been subjected to spatial and temporal analysis. Maps of the mean monthly LW↑↓ over the Baltic were drawn using the new semi-empirical formula for the Baltic Sea (Zapadka et al. 2007). The input data for the formula, such as sea surface and air temperatures, and cloud cover, were obtained from the Tiros N/NOAA and METEOSAT 7 satellites and from the UMPLfo recast model (see http://meteo.icm.edu.pl). The mean annual LW↑↓ for 2001 was estimated at 63 W m−2 and compared with available data from other sources. The monthly maps of the net flux LW↑↓ over the Baltic show that the total values reach a minimum (LW↑↓≈50 W m−2) in April, September, October and a maximum (LW↑↓≈80 W m−2) in November. The statistical error of daily maps, on which the monthly maps were based, is no more than 18 W m−2.
4

Effects of climate warming on vegetative phenology of the common beech Fagus sylvatica in a submontane forest of the Western Carpathians: two-decade analysis

80%
Schieber B., Kubov M., Janik R.
Polish Journal of Ecology
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2017
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tom 65
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nr 3
The paper examines the results of phenological research on common beech (Fagus sylvatica L.) during a period of 21 years (1995–2015) in the submontane beech forest of central Slovakia (Inner Western Carpathians). We focused on bud-burst, leaf unfolding and leaf colouring. Temporal analysis indicated that the mean monthly air temperature increased, especially from April to August. An extraordinary increase of air temperature in March and April, mostly in the last decade, was detected. The precipitation from May to August varied considerably, but in the range of the long-term mean value. During the study period, the mean/earliest/ latest onset of the bud-burst of common beech was observed on the 110th /101st/120th day of the year (DOY), respectively. As for leaf unfolding 10% and 50% (LU 10 and LU 50), we found the mean/earliest/latest onset on the 114th/103rd/122nd DOY and on the 118th/108th/124th DOY, respectively. The mean/earliest/latest onset of leaf colouring 10% (LC 10) and 50% (LC 50) started on the 272nd/262nd/288th DOY and on 286th/276th/298th, respectively. A medium degree of negative correlation (r = -0.68, P < 0.05) was found between air temperature and spring plant development (LU 50). In contrast, for both the cumulative temperature and precipitation, we found very low correlation with autumnal leaf phenology (r ≤ 0.3, P > 0.05). The vegetation period of the examined tree species lasted for 168 days on average (min/max were 155/183 days). Trend analysis revealed an earlier onset of spring phenophases by 7 days/2 decades. Conversely, a delay of autumnal phenophases by 9 days was recorded, so the vegetation period of beech extended by more than two weeks during the study period.
5

Struktura wykształcenia rolniczego kierowników gospodarstw rolnych w Polsce: analiza czasowa i przestrzenna zjawiska

70%
Gwiazdzinska-Goraj M., Rudnicki R.
Acta Scientiarum Polonorum. Administratio Locorum
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2015
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tom 14
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nr 2
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