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| Home > Publications database > Dissolved Organic Carbon and Nitrogen Mineralization Strongly Affect CO2 Emissions Following Lime Application to Acidic Soil |
| Journal Article | FZJ-2015-05370 |
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2015
Inst.
Karachi
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Abstract: Emission of greenhouse gases from agricultural soils has main contribution to the climatic change and global warming. Dynamics of dissolved organic carbon (DOC) and nitrogen mineralization can affect CO<sub>2</sub> emission from soils. Influence of DOC and nitrogen mineralization on CO<sub>2</sub> emissions following lime application to acidic soil was investigated in current study. Laboratory experiment was conducted under aerobic conditions with 25% moisture contents (66% water-filled pore space) at 25°C in the dark conditions. Different treatments of lime were applied to acidic soil as follows: CK (control), L (low rate of lime: 0.2g lime / 100 g soil) and H (high rate of lime: 0.5g lime / 100g soil). CO<sub>2</sub> emissions were measured by gas chromatography and dissolved organic carbon, NH<sub>4</sub><sup>+</sup>-N, NO<sub>3</sub><sup>-</sup>-N and soil pH were measured during incubation study. Addition of lime to acidic soil significantly increased the concentration of DOC and N mineralization rate. Higher concentrations of DOC and N mineralization, consequently, increased the CO<sub>2</sub> emissions from lime treated soils. Cumulative CO<sub>2</sub> emission was 75% and 71% higher from L and H treatments as compared to CK. The results of current study suggest that DOC and N mineralization are critical in controlling gaseous emissions of CO<sub>2</sub> from acidic soils following lime application
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