Abstract
Urban soils are the most vulnerable component of the current terrestrial ecosystem. Due to the anthropogenic influence, various pollutants can accumulate in the soils and have a negative effect on the health of citizens. As a result of the degradation of permafrost landscapes, the disappearance of a number of natural ecosystems, as well as urban areas, is possible. In the course of the development of thermokarst processes, problems arise in the urban environment with the destruction of urban buildings and a decrease in agricultural areas. The ecosystem of Yakutsk city is located in the valley of the Lena River and represents the largest urbanized terrestrial biotope, located in the permafrost-affected bioclimatic and geogenic conditions. This work represents relevant datasets on the physico-chemical, toxicological and agrochemical state of soil cover components in various functional zones of the city. An 3excess of the maximum threshold levels for Zn was noted in the area of active mining within the city borders. From the data obtained of pollution state, the most polluted zone of Yakutsk city is the quarry complex located in relative proximity to the city. In other studied areas of the city, there is no excess of permissible threshold levels for trace elements. According to agrochemical analysis, in Yakutsk city, there is a relatively low content of available agrochemical elements in comparison with other cities located in the permafrost-affected zone.
Highlights
The role of soil in an urbanized ecosystem is significant and varied [1,2]
From the data obtained of pollution state, the most polluted zone of Yakutsk city is the quarry complex located in relative proximity to the city
The highest pH values are in the area of fallow lands, which is apparently associated with alkalization of the territory [33]
Summary
Soil is the main component of the urban ecosystem, in which the air, water and bioinert components of the environment interact [3,4]. Implementing important environment-forming functions, the soil changes the chemical composition of atmospheric precipitation and groundwater, it is a universal sorbent, a supplier and regulator of the content of carbon dioxide, oxygen, nitrogen in the air [5]. Due to its specific properties, the soil largely determines the conditions of human life in the city, performing sanitary and recreational functions [6,7]. The flooded areas are landscapes with expressed geochemical activity [12] This explains the high intensity of the soil-forming process in floodplain landscapes [13]. Biological activity and dynamics of chemical and biogeochemical processes determine the fertility of floodplain soils [10]
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