Abstract
Methane (CH4) oxidation in soil reduces the concentration of this greenhouse gas due to the activity of methanotrophic bacteria. This process is influenced by chemical and physical parameters of soil. We tested the methanotrophic activity of selected mineral soils (Mollic Gleysol, Haplic Podzol, Eutric Cambisol) contaminated with lead (Pb) under different soil water potentials (pF 0; 2.2; 3.2). The heavy metal was added as PbCl2 in two doses. Together with the initial content of Pb in soils, the final contents of heavy metal in different soils were 11.6 and 30.8 mg kg−1 in Eutric Cambisol, 7.1 and 26.3 mg kg−1 in Haplic Podzol, and 12.2 and 31.4 mg kg−1 in Mollic Gleysol (dry mass of the soil is specified in all cases). The results showed relatively low sensitivity of methane oxidation to the addition of the heavy metal. The major factor controlling this process was soil water content, which in most cases turned out to be the most optimal at pF = 2.2.
Highlights
The problem of greenhouse gas (GHG) emission in the context of climate changes is still very urgent (Serrano-Silva et al.Responsible editor: Philippe Garrigues2014)
The literature review leads to a conclusion that a relatively small number of investigations concerning all GHGs are devoted to methane in the context of contaminated soils
In Eutric Cambisol, the most effective methane oxidation was noted at pF 0
Summary
The problem of greenhouse gas (GHG) emission in the context of climate changes is still very urgent (Serrano-Silva et al.Responsible editor: Philippe Garrigues2014). The literature review leads to a conclusion that a relatively small number of investigations concerning all GHGs are devoted to methane in the context of contaminated soils. For the last 200 years, the concentration of this gas has doubled, due to the increase in its emission caused by anthropogenic sources such as ruminant husbandry, rice production, fossil fuel excavation, and burning or utilization of wastes. Another reason is the climate change-driven imbalance between CH4 emission and oxidation (Nosalewicz et al 2011; Contin et al 2012; Frąc and Ziemiński 2012; Walkiewicz et al 2016)
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