Тип публикации: препринт
Год издания: 2022
Идентификатор DOI: 10.2139/ssrn.4202081
Аннотация: Wildfire is a threat for many boreal ecosystems and induce deep modifications in organic horizons (forest litters). The contribution of litter impact on soil organic matter in the boreal forests currently insufficiently studied. In this study, we considered fire-induced changes organic horizon property changes. The effect of fire wПоказать полностьюas studied by using forest litter burning experiment. Sample heating was performed in the lab at fixed temperatures (200, 300 and 500℃), on a set of O horizons developed under pine (Flavocetrario-Pinetum association) and spruce (Piceetum hylocomiosum association) forest litters. Litters were analyzed in terms of pH, specific electrical conductivity, specific surface area, total carbon (C tot ) and nitrogen (N tot ) content, water-soluble carbon and nitrogen, δ 13 C and δ 15 N stable isotope analysis and 13 C NMR spectroscopy. The fire, to varying degrees, had effects on all researched parameters of litter in boreal forests. The mean pH values are increased from ~5 to ~8.2 with an increase in the influence of temperature. The specific electrical conductivity and specific surface area properties are increased as well from ~255 to ~432 and from 0.42 to 1.84, respectively. C tot and N tot decreased, but at the same time the inorganic carbon content increased. The aromaticity of organic matter in the organic matter remaining after the fire increases as well. The results of the present study showed that soil probably can be changed by mixing with burned forest litter and this discussion made it clear to help with the understanding how fire induces on that process. The soil organic horizon, in contrast to the mineral horizon, is a sensitive indicator of humus genesis and modern climatic changes in the biosphere. Therefore, the study of the effect of fires is necessary for a competent understanding of the processes in soils.
Место издания: Social Science Research Network