Naseer Ahmad Dar, Ashok Kumar Pandit and Bashir Ahmad Ganai
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Katarzyna Grabowska, Dariusz Borowiak and Kamil Nowiński
The article presents the results of experimental research on evapotranspiration and transpiration of a common reed bed. The study was conducted in 2014–2015 on Lake Raduńskie Górne (Kashubian Lakeland) in the summer half-year from 1 May to 31 October. In the experiment two sets of standard evaporimeters GGI-3000 were used. One of the evaporimeters was filled with water, while the second additionally contained common reed. During the experiment medium reed bed density was 240 shoots per square metre. The results of the study showed that during the research period the average daily common reed transpiration was 3.9 mm, and the daily maxima reached 12.1–12.5 mm. Average monthly transpiration totals ranged from 42.8 (October) to 208.5 mm (August). During the growing season, the loss of water to transpiration reached 872–971 mm. The average transpiration rate, determined in the conditions of already well developed reed bed (June-September), was 1.83 dm3 m−2 d−1. The values of the ratios Th/EO and ETh/EO, determined during the experiment, were within the ranges reported in most previous research. The average ratio Th/EO was 1.6, and the ratio ETh/EO was 2.0. These values indicate that during the vegetation period common reed transpiration is higher by 60% from open water evaporation, and the total water losses from the common reed bed to evapotranspiration are twice as high as water loss in open water evaporation.
Sinkevičienė Z., 2013: Confirmation of Utricularia australis occurrence in Lithuania [Utricularia australis auga ir Lietuvoje]. - Bot. Lith., 19(2): 161-164. Occurrence of Utricularia australis R. Br. on the territory of Lithuania was confirmed by finding it in Lake Kampinis, Varėna district municipality. Morphological differences between similar species U. australis and Utricularia vulgaris as well as species composition of the association Utricularietum australis and accompanying communities are presented and discussed.
The paper confirms the presence of Elodea canadensis Michx. in Greece and outlines the history of contradictory relevant reports. This is also the first report of the species′ presence in the transboundary lake Great Prespa.
Bartosz Jawecki, Tomasz Jaroszewicz-Smyk and Andrzej Drabiński
The paper presents the results of research on the spatial variation of oxygen condition in a carp pond. The analysis of dissolved oxygen was carried out in the summer in 29 measuring points. In the analysed months the differences were determined between dissolved oxygen concentration in the strip of rushes and the part of the pond free from macrophytes. In the strip of rushes, the average concentration of dissolved oxygen was between 4.69-6.49 mg O2·dm-3. In the part of pond located near the strip of rushes the oxygen concentration was between 6.23-7.91 mg O2·dm-3 and in open water concentration of dissolved oxygen was in range 7.60-9.09 mg O2·dm-3. It was found that the biggest differences in oxygen concentration occur between the strip of rushes and the open water column: 40% in June, 26% in July, 28% in August, 38% in September, respectively. In the south-western part of the pond, covered with macrophytes and shaded by trees, the worst oxygen conditions were observed - below the optimum level for carps, sometimes reaching lethal values. The best oxygen conditions, noted in July and August, were in the central and northern part of the pond including the fishery and feeding point. In order to improve the oxygen conditions in macrophytes zone it is recommended to remove the rushes periodically and to remember to leave the part of emergent plants that are necessary for breeding and living avifauna. The scope and timing of the removal of plants has to be consulted and co-ordinated with the Regional Conservator of Nature.
Vladimir I. Chikov, Elvira V. Isaeva, Anna A. Ratushnyak, Oleg Yu Tarasov, Kseniya I. Abramova and Maxim V. Trushin
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RATUSHNYAK, A. A., 2008: The investigation of exometabolism of some aquaticmacrophytes. Global
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Abou-Hamdan, H., Haury, J., Hebrard, J. P., Dandelot, S., Cazaubon, A. (2005). Macrophytic communities inhabiting the Huveaune (South-East France), a river subject to natural and anthropic disturbances. Hydrobiologia , 551, 161-170.
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Dragana Petrović, Dejan Jančić, Martina Furdek, Nevenka Mikac and Slađana Krivokapić
alpine and arctic lake sediments as a record of diffuse atmospheric contamination across Europe. Freshwater Biology 54, 2518–1532.
Cardwell, A. J., Hawker, D. W., Greenway, M., 2002: Heavy metal accumulation in aquaticmacrophytes from southeast Queensland, Australia. Chemosphere 48, 653–663.
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GOEL, A.,GOEL, A. K, SHEORAN, I. S., 2003: Changes in oxidative stress enzymes during artificial ageing in cotton (Gossypium hirsutum L.) seeds. Journal of Plant Physiology 160, 1093-1100.
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