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| Effects of soil bulk-density on soil moisture and nitrous oxide emissions |
| Received:March 25, 2024 |
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| KeyWord:nitrous oxide;soil moisture;soil density;fluvo-aquic soil;black soil;latosol soil |
| Author Name | Affiliation | E-mail | | LI Yun | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | WANG Guoli | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | SONG Xiaotong | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | JU Xiaotang | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | juxt@cau.edu.cn |
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| Abstract: |
| For a more rational understanding of the relationship between soil bulk weight on soil moisture and N2O production and emission. In this study, three typical agricultural soils（fluvo-aquic soil, black soil, and latosol soil）in China were used to investigate the effect of soil bulk density on moisture status and N2O emission under conditions of equal water-filled porosity of soil（WFPS）. The static microcosm incubation method was employed, with five bulk density levels（1.0, 1.1, 1.2, 1.3 g·cm-3, and 1.4 g·cm-3）under conditions of 60% WFPS. At 60% WFPS, the actual moisture status of the soils varied greatly with variations in bulk density. Fluvo-aquic soil was aerated only at high bulk densities of 1.3 g·cm-3 and 1.4 g·cm-3, black soil was aerated at all bulk densities of 1.1, 1.2, 1.3 g·cm-3 and 1.4 g·cm-3, and the moisture status of latosol soil was least affected by bulk density, with no flooding occurring. N2O emissions from fluvoaquic soil were far more significant at a bulk density of 1.0 g·cm-3（3 268 μg·kg-1）than at bulk densities of 1.1 g·cm-3（118 μg·kg-1）, 1.2 g·cm-3（136 μg·kg-1）, 1.3 g·cm-3（64 μg·kg-1）, and 1.4 g·cm-3（129 μg·kg-1）; N2O emissions of 220, 104, 67, 90 μg·kg-1, and 136 μg·kg-1 were obtained with bulk densities of 1.0, 1.1, 1.2, 1.3 g·cm-3 and 1.4 g·cm-3, respectively; and N2O emissions first decreased and then increased as the bulk density increased. N2O emissions of 57, 62, 61, 68 μg·kg-1, and 122 μg·kg-1 were obtained from latosol soil with bulk densities of 1.0, 1.1, 1.2, 1.3 g·cm-3 and 1.4 g·cm-3, respectively; there were significant differences in N2O emission from latosol soil at a bulk density of 1.4 g·cm-3. The difference in emissions between fluvo-aquic soil and black soil at 1.0 g·cm-3 could be attributed to soil flooding, whereas the significant emissions at 1.4 g·cm-3 may be due to denitrification resulting from soil compaction to promote anaerobic conditions. Under the same WFPS condition, bulk density significantly affects the actual soil water status and N2O emission, especially in low-carbon soils, Therefore, when quantifying the effect of WFPS on N2O emission, the bulk density and weight moisture content（actual water status）need to be quantified. |
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