Herodek, Sándor and Oláh, János (1973) Primary production in the frozen Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 40. pp. 197-206. ISSN 0365-3005
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Abstract
Of the light one tenth was transmitted by ice covered by 4 cm snow and the half by snow-free ice. The water was rather clear under the ice, therefore in case of snow-free ice one tenth of the surface light reached the bottom. This illumination is higher than that in the unfrozen lake, where due to the turbidity caused by waves the bottom illumination is usually less than 1 percent. The chlorophyll-a content of the water increased downwards. Related to surface it was 1 µg/cm². Similar vertical distribution was observed in the µ-algae, occuring in the water under the ice. The chlorophyll-a content of the bottom was 6.6—8.5 µg/cm² on the 31st January and 15.1—15.5 µg/cm² on the 5th February 1973. When the ice was covered by snow the primary production of phytoplankton, measured by ¹⁴C method, was 4 mg C/m²/hour and decreased downwards. Under the snow-free ice it was 20 mg C/m²/hour and increased downwards. The production of the microphytobenthos was measured by both ¹⁴C and O₂ methods. No production was found in April—September due to the turbidity of water. In the frozen lake when ice was covered by snow even the gross primary production in the benthos was very low. In case of snowfree ice intensive benthic photosynthesis was found. The primary production at three different days was 36 mg C/m²/hour, 122 mg O₂/m²/hour and 115 mg O₂/m²/hour. In the lake covered by snow-free ice the total primary production of the plankton and benthos was amounted to 560 mg C/m²/day, which is similar to the summer maximum of planktonic production. In the ice-covered lake the oxygen content of the water was with 9.6 mg/litre higher th a n before freezing, indicating the accumulation of high amounts of organic material.
Item Type: | Article |
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Subjects: | G Geography. Anthropology. Recreation / földrajz, antropológia, kikapcsolódás > G Geography (General) / Földrajz általában Q Science / természettudomány > QK Botany / növénytan |
Depositing User: | Edina Fejős |
Date Deposited: | 26 May 2024 14:12 |
Last Modified: | 26 May 2024 14:12 |
URI: | https://real.mtak.hu/id/eprint/195744 |
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