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首页> 外文期刊>Wetlands Ecology and Management >Physiological consequences of mowing and burning of Phragmites australis stands for rhizome ventilation and amino acid metabolism
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Physiological consequences of mowing and burning of Phragmites australis stands for rhizome ventilation and amino acid metabolism

机译：Physiological consequences of mowing and burning of Phragmites australis stands for rhizome ventilation and amino acid metabolism

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Mowing and burning of Phragites australis-stands have been recommended in the recent literature as management tools for both protection and control, and both favourable and detrimental effects of these treatments were actually observed. This study aims to clarify this apparent contradiction using a new physiological approach. Reed stands in the biosphere reserves of Trebon (Czech Republic) and the Danube Delta (Romania) were investigated using parameters of convective ventilation and amino acid patterns. Flooded sown reed an unflooded burned reed was compared to unmanaged control stands with comparable hydrology and trophic level. Management took place in winter. The elimination of old culms through mowing resulted in a lower ventilation efficiency due to a high counterpressure of rhizomes. The corresponding gas flow rates were reduced to 38% of the value in control stands, indicating a strongly impaired oxygen supply to basal and below-ground plant parts after mowing. Concomitantly, significantly increased levels of alanine and gamma-aminobutyric acid in basal culm internodes of shoots were measured as signs of a metabolic shift due to hypoxic stress. Conversely, shoot loss by burning (without flooding) did not diminish ventilation efficiency and gas flow rate, i.e. oxygen supply to buried organs was unaffected. Correspondingly, the level of hypoxia-indicating amino acids (alanine, gamma-aminobutyric acid) did not indicate more severe oxygen deficiency in basal and below-ground plant parts of burned reed. It is concluded that the impact of mowing and burning on P. australis strongly depends on the water level and on whether or not flooding occurs after the treatment. The mechanism responsible for detrimental effects is probably impaired convective ventilation followed by hypoxia in basal plant parts. THis aspect should be taken into account when mowing or burning in winter are used as management tools for wetlands.

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