DYNAMICS OF SOIL CATALASE ACTIVITY IN THE POST-PYROGENIC FOREST ECOSYSTEM
Keywords:
soil, catalase activity, post-pyrogenic forest ecosystem, abiotic factors.Abstract
It is important to track and analyze the ecological restoration of forest ecosystems after fires. This is especially relevant in regions where historically such phenomena have occurred infrequently. Global warming increases the relevance of such research. A sensitive diagnostic criterion is the enzymatic activity of the soil. This is closely related to the physico-chemical properties of the soil, its microbial biomass and vegetation, which undergo significant changes and transformations in the post-pyrogenic period. The aim of our research was to track the dynamics of catalase activity in the soil within the sub-forests of the south-eastern part of the Volyn Polissia after a medium-intensity fire. The research lasted from June 2021 to November 2022 in a forest area with sparse stands. Sampling of soil to determine the activity of catalase enzyme was carried out every month. At the same time, instrumental determination of soil temperature, humidity, and pH was carried out at the sampling site. This made it possible to monitor the effect of seasonal changes in abiotic environmental factors on enzymatic activity. During eighteen months of observation, a 3-fold increase in the activity of the catalase enzyme was noted: from 0.92±0.2 mgO2/g/min to 2.10±0.17 mgO2/g/min, with peak values in September 2022. which was at the level of 3.13±0.31 mgO2/g/min. The statistical significance of the linear dependence of soil temperature (r=0.58), soil moisture (r=0.57) and soil pH (r=0.64) on its catalase activity was confirmed. The multivariate regression dependence of the same factors simultaneously had a close relationship (r=0.97). It is assumed that among all analyzed abiotic factors, the change in pH against the background of seasonal temperature fluctuations and corresponding changes in soil moisture has a decisive influence on the processes of restoration of catalase activity of post-fire forest soil. Continuation of such research may be valuable in view of the development of tools for early diagnosis of recovery of the post-pyrogenic soil of the forest ecosystem of the southeastern part of the Volyn Polissia. This is also an important task in the management and restoration programs of Ukraine's post-fire territories.References
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