Soil organic carbon stability of urban soils and of floodplain soils under different hydrothermal conditions

Abstract

<p><span><span>Пожалуйста, вставьте свой абстрактный HTHigh anthropogenic impact and the rate of urbanization result in a decrease of urban soils’ capacity to perform ecosystem services. Carbon sequestration is an important soil-based ecosystem service, which can be assessed through quantity and quality soil carbon stocks. The stability of soil organic matter (SOM) is characterized by the resistance of its constituent components to biological, chemical and physical destruction. In the study, SOME stability in peat-sand mixture used for urban soils’ construction; floodplain soil was analyzed in response to temperature-moisture conditions. The decomposition rate of various soils was assessed. Decomposition was assessed through studying microbial production of CO2. In the research the CO2 emissions were studied under following temperatures and moisture conditions: temperature – 7°C, 22°C, 30°C and 40°C and moisture – 0.2 WHC, 0.4 WHC, 0.6 WHC, 0.8 WHC, 1 WHC. Moisture affects the amount and activity of microbial biomass, controls the availability of oxygen to microorganisms, causes periods of water microbial stress and also can destabilize organic matter, resulting in increased availability of carbon to soil microorganisms. Different patterns of moisture and temperature impacts on the soil organic carbon (SOC) decomposition rates were observed. It was concluded that, depending on the qualitative composition of carbon, the impact of hydrothermal conditions on the emission of carbon dioxide changed.ML здесь.</span></span></p>

Microbiocenosis of Anthropogenically Transformed Soils

“…Morphological and structural changes in microbial populations and changes in their biochemical activity serve as a reflection of the anthropogenic impact on the ecosystem. Microbial reactions to the impact of anthropogenic factors are manifested quickly and quite clearly, which makes it possible to quickly identify the most vulnerable ecological zones, to predict their state while maintaining anthropogenic impact and to arrange the measures necessary to mitigate this impact [8]. Soil pollution leads to a deterioration of their properties, causes a decrease in biological activity, therefore, the identification of individual groups of microorganisms that can withstand toxic effects and the use of their adaptive capabilities can help cleanse soil from the products of technogenic pollution [9].…”

“…Morphological and structural changes in microbial populations and changes in their biochemical activity serve as a reflection of the anthropogenic impact on the ecosystem. Microbial reactions to the impact of anthropogenic factors are manifested quickly and quite clearly, which makes it possible to quickly identify the most vulnerable ecological zones, to predict their state while maintaining anthropogenic impact and to arrange the measures necessary to mitigate this impact [8].…”

“…In a difficult ecological situation in the city, including cases of disturbed soil properties, saprotrophic microbial communities continue to function due to their high biological and ecological plasticity [11]. It was also established that humidity affects the quantity and activity of microbial biomass, controls the availability of oxygen for microorganisms, causes periods of microbial stress in water, and may also contribute to the destruction of organic matter, which leads to increased availability of carbon for soil microorganisms [8]. Thus, an attention should be focused on supporting and restorative processes that stimulate the functioning of soil and soil ecosystems [12,13].…”