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Karpinets L.I., Lobachevska O.V. Seasonal dynamics of ...
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  Karpinets L.I., Lobachevska O.V.
Seasonal dynamics of the nitrogen mineral forms content in the shoots of the moss Atrichum undulatum (Hedw.) P. Beauv. on conditions of the Ukrainian Roztochіa forest ecosystems // Proc. of the State Nat. Hist. Mus. - Lviv, 2025. - 41. - P. 75-86 DOI: https://doi.org/10.36885/nzdpm.2025.41.75-86 Key words: moss Atrichum undulatum, forest ecosystems, seasonal changes, microclimatic conditions, ammonium cations, nitrate anions The features of seasonal dynamics of the nitrogen ammonium and nitrate forms content in the assimilating green and brown senescent parts of shoots of the epigeic moss Atrichum undulatum (Hedw.) P. Beauv. depending on the microclimatic conditions of the reserve and anthropogenically disturbed areas (felling and recreational load) of the Ukrainian Roztochia forest ecosystems were studied. It was determined that in April the amount of ammonium cations was the highest in open areas of felling under conditions of higher air temperature and light intensity, which significantly induced biochemical reactions in nitrogen metabolism in the photosynthesizing shoots and destruction processes in the brown part of gametophyte. It was established that with sufficient insolation the nitrates content in the green vegetative part of the shoots increased, which may indicate the inhibition of the nitrate- and nitrite reductases activity in Atrichum undulatum cells by ammonium cations. It was investigated that in July the stability of microclimatic conditions of water-temperature regime of air and surface soil layer in the reserved area positively influenced the processes of nitrogen plastic and energy exchange in physiologically active and senescent parts of the shoots, as evidenced by higher indicators of ammonium content than in recreation and felling areas. Under the influence of insignificant insolation in the reserved area and in the recreational load zone, increasing the amount of nitrates in green shoots is due to a decrease in the activity of nitrate-reducing enzymes. At the same time, in the felling zone, the inactivation of nitrate- and nitrite reductases in moss cells was caused primarily by moisture deficiency in the surface soil layer under excessive exposure to sunlight. It was found that in the studied areas of reserve and anthropogenically modified forest ecosystems, the content of ammonium cations and nitrate anions in the green and brown parts of shoots was mainly higher in October, which may indicate higher physiological activity of moss in favorable conditions, primarily of the water regime, which increased the absorption capacity of inorganic forms of biogenic element, the processes of assimilation/dissimilation and accumulation in cells of the oxidized form of nitrogen - NO3-.  
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