Abstract

Mineralization rates of soil organic matter (SOM) decomposition in nonremediated and remediated oil-polluted soils and background soils from the main types of West Siberian middle-taiga ecosystems have been measured in laboratory experiments. The rates of SOM mineralization were measured by alkali absorption of CO₂ released from wet soil samples at 20°C (basal respiration). Taking into account the linear character of the cumulative curves of CO₂ release, the rates of SOM mineralization were estimated using the mineralization index K₁, equal to the annual amount of CO₂ released per 1 g dry soil. The K₁ values varied from 0.123 to 1.578 mg CO₂/g/day. The highest value was recorded in the background forest soil, while the lowest value in the oil-polluted peat soil with extremely high oil content (544 g/kg). The K₁ values were negatively correlated with oil content (K = –0.57). The SOM mineralization rate in remediated oil-polluted peat soils varied from 0.31 to 0.85 mg CO₂/g/day.

中文翻译：

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实验室条件下西西伯利亚中针叶林区油污染和修复油污染土壤中有机物的矿化

摘要

在实验室实验中测量了来自西西伯利亚中针叶林生态系统主要类型的未修复和修复的油污染土壤和背景土壤中土壤有机质 (SOM) 分解的矿化率。SOM 矿化的速率是通过碱吸收从 20°C 湿土壤样品中释放的 CO ₂来测量的（基础呼吸）。考虑到 CO ₂释放累积曲线的线性特征，使用矿化指数K ₁估计 SOM 矿化率，等于每 1 g 干土每年释放的 CO ₂量。所述ķ ₁值变化从0.123至1.578毫克的CO ₂/克/天。在背景森林土壤中记录到最高值，而在含油量极高（544 g/kg）的油污染泥炭土中记录到最低值。所述ķ ₁值负油含量相关（ķ = -0.57）。修复后的油污染泥炭土壤中的 SOM 矿化速率从 0.31 到 0.85 mg CO ₂ /g/天不等。