Soil is a non-renewable environment in which, depending on the prevailing O₂ conditions, two opposite processes – methanogenesis and methanotrophy - may take place. The rates of the processes may result in soil acting as a sink or a source of methane (CH₄). Due to agricultural practices, heavy metals may accumulate affecting soil microbial processes. We tested the effect of cadmium (Cd) contamination on CH₄ emission and uptake in three mineral soils (Eutric Cambisol, Haplic Podzol, Mollic Gleysol). Additionally, in the methanotrophy study, different soil moisture levels (pF 0; 2.2; 3.2) were studied. Based on the European annual and maximum limits, soils were polluted with cadmium in four doses (per dry soil mass): 0.048 mg Cd kg⁻¹ (and its five-fold higher value) and 3.00 mg Cd kg⁻¹ (and its five-fold higher value). The results showed that all tested soils produced and consumed CH₄. Methane production rates were not significantly changed by the presence of the cadmium (except annual five-fold Cd dose in Podzol). In methanotrophy study, soil moisture was stronger regulator of CH₄ oxidation (p < 0.05) than Cd pollution which effect depended on the soil type, Cd dose and pF level. CH₄ was completely consumed in Cambisol (only at pF 0 with the rate significantly different from the rates at pF 2.2 and 3.2) and in Gleysol (at pF 0; pF 2.2; the CH₄ oxidation rates were significantly different among all tested moistures with annual Cd dose), but this process was delayed after the application of the higher Cd doses. Among the tested soils, only the Podzol oxidized the added CH₄ under all tested moisture levels (with the rate significantly different at pF 2.2 wit annual Cd dose), while Cd addition delayed CH₄ uptake as well. In the Podzol, CH₄ consumption was inhibited only by the highest Cd dose at low moisture (pF 3.2).

土壤是不可再生的环境，在该环境中，根据普遍的O ₂条件，可能发生两个相反的过程-甲烷生成和甲烷氧化。该过程的速率可能导致土壤充当甲烷（CH ₄）的汇或源。由于农业习惯，重金属可能会累积，从而影响土壤微生物过程。我们测试了三种矿物土壤（Eutric Cambisol，Haplic Podzol，Mollic Gleysol）中镉（Cd）污染对CH ₄排放和吸收的影响。此外，在甲烷甲烷营养研究中，研究了不同的土壤水分含量（pF 0； 2.2； 3.2）。根据欧洲的年度和最大限量，土壤被镉污染了四次（每干燥土壤质量）：0.048 mg Cd kg ^-1（及其较高值的5倍）和3.00 mg Cd kg ^-1（及其较高值的5倍）。结果表明，所有测试土壤均产生和消耗CH ₄。镉的存在不会显着改变甲烷的生产率（除了Podzol中每年5倍的Cd剂量外）。在甲烷甲烷营养研究中，土壤水分是CH ₄氧化的调节剂（p <0.05）比Cd污染更强，其影响取决于土壤类型，Cd剂量和pF水平。CH ₄在雏形土被完全消耗（仅在pF的0与速率从速率显著不同在pF的2.2和3.2）和在Gleysol（在pF的0; pF的2.2;所述CH ₄在所有测试的含水量中，每年的Cd氧化速率显着不同），但是在应用更高的Cd剂量后，该过程被延迟了。在所有测试土壤中，只有Podzol在所有测试的水分含量下均会氧化添加的CH ₄（在以年Cd剂量计pF 2.2时，速率显着不同），而Cd的添加也会延迟CH _4的吸收。在Podzol中，CH _4的消耗仅在低水分条件下被最高的Cd剂量所抑制（pF 3.2）。