Abstract
Soil acidification is one of the main problems to crop productivity as well as a potent source of atmospheric nitrous oxide (N2O). Liming practice is usually performed for the amelioration of acidic soils, but the effects of dolomite application on N2O emissions from acidic soils are still not well understood. Therefore, a laboratory study was conducted to examine N2O emissions from an acidic soil following application of dolomite. Dolomite was applied to acidic soil in a factorial design under different levels of moisture and nitrogen (N) fertilizer. Treatments were as follows: dolomite was applied as 0, 1, and 2 g kg−1 soil (named as CK, L, and H, respectively) under two levels of moisture [i.e., 55 and 90 % water-filled pore space (WFPS)]. All treatments of dolomite and moisture were further amended with 0 and 200 mg N kg−1 soil as (NH4)2SO4. Soil properties such as soil pH, mineral N (NH4 +-N and NO3 −-N), microbial biomass carbon (MBC), dissolved organic carbon (DOC), and soil N2O emissions were analyzed throughout the study period. Application of N fertilizer rapidly increased soil N2O emissions and peaked at 0.59 μg N2O-N kg−1 h−1 under 90 % WFPS without dolomite application. The highest cumulative N2O flux was 246.32 μg N2O-N kg−1 under 90 % WFPS without dolomite addition in fertilized soil. Addition of dolomite significantly (p ≤ 0.01) mitigated N2O emissions as soil pH increased, and H treatment was more effective for mitigating N2O emissions as compared to L treatment. The H treatment decreased the cumulative N2O emissions by up to 73 and 67 % under 55 and 90 % WFPS, respectively, in fertilized soil, and 60 and 68 % under 55 and 90 % WFPS, respectively, in unfertilized soil when compared to those without dolomite addition. Results demonstrated that application of dolomite to acidic soils is a promising option for mitigating N2O emissions.
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This research work was financially supported by the National Natural Science Foundation of China (41171212) and the National Basic Research Program of China (2012CB417106), and also by Program for Changjiang Scholars and Innovative Research Team in University (IRT1247).
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Shaaban, M., Peng, Qa., Hu, R. et al. Dolomite application to acidic soils: a promising option for mitigating N2O emissions. Environ Sci Pollut Res 22, 19961–19970 (2015). https://doi.org/10.1007/s11356-015-5238-4
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DOI: https://doi.org/10.1007/s11356-015-5238-4