Microtopography and surface burning effects on peat hydro-physical properties and water chemistry of mires in Western Siberia
The paper analyzes changes in the hydrological characteristics and water chemistry of mires in the forest-tundra and taiga zones of Western Siberia under the influence of the pyrogenic factor at the microlevel. In the taiga zone, research was carried out in drained sites of the Bakchar Bog (spurs of the Great Vasyugan Mire) and Ust-Bakchar bog, in the forest-tundra on a pristine palsa near Pangody village. All studied mires burned out in 2014-2016. The studies were carried out on 12 model key plots with an area 25 m2, where the water chemistry, hydraulic conductivity and water table levels were determined in 9 wells linked to the surface microtopography. The surface surface microtopography was surveyed using a SOKKIL CX-105 tacheometer with a step of 50 cm. The hydraulic conductivity was determined in the 0-50 cm and 50-100 cm layers by pumping using a Solinst 428 sampler. Analysis of the background sites showed initial differences in water chemistry characteristics, the bogs of the taiga zone were drained, as a result, higher O2 content, pH values, Eh, EC, as well as temperature were noted in the samples due to a more southern location. The palsa near Pangody village was not drained, therefore, lower pH and EC were noted in the waters, but the CO2 content was higher due to the active processes of decomposition of plant residues under leaching conditions. Studies have shown that after fires, due to the formation of a hydrophobic layer on the surface, there is a decrease in the O2 content and Eh values in waters, and vice versa, there is an increase in pH, EC, CO2 concentration and temperature. Under background unburn conditions, the studied characteristics smoothly decrease from hummock to hollow, and under pyrogenic conditions, variations in pH, EC, T, Eh, CO2, O2 in waters strongly depend on the degree of burnout and the initial transformation of the surface under the influence of drainage. Under the influence of the pyrogenic factor, water table levels increase; with increasing thickness of the burnt layer, the correlation between the height of the surface and the position of water table levels decreases, since the water storage capacity of the upper layer of the peat deposit is disrupted. Hydraulic conductivity in peat deposits of burnt bogs in the taiga zone decrease due to disruption of the porous structure of the upper peat layer, and in the forest-tundra it increase as a result of transformation of the thermal regime. Higher hydraulic conductivity are observed in hollows and at the middle surface level, and, conversely, decrease in hummocks. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.
Keywords
mires,
waters,
chemical composition,
microtopography,
water table level,
hydraulic conductivity,
forest reclamation,
pyrogenic factor,
Western SiberiaAuthors
| Kharanzhevskaya Yulia A. | Siberian Federal Scientific Centre of Agro-BioTechnologie, RAS, Siberian Research Institute of Agriculture and Peat | kharan@yandex.ru |
| Sinyutkina Anna A. | Siberian Federal Scientific Centre of Agro-BioTechnologie, RAS, Siberian Research Institute of Agriculture and Peat | ankalaeva@yandex.ru |
Всего: 2
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