| 李赟,王国丽,宋晓桐,巨晓棠.容重对土壤水分状况及氧化亚氮排放的影响[J].农业环境科学学报,2025,44(4):1126-1134. |
| 容重对土壤水分状况及氧化亚氮排放的影响 |
| Effects of soil bulk-density on soil moisture and nitrous oxide emissions |
| 投稿时间：2024-03-25 |
| DOI：10.11654/jaes.2024-0257 |
| 中文关键词: 氧化亚氮 土壤水分 土壤容重 潮土 黑土 砖红壤 |
| 英文关键词: nitrous oxide soil moisture soil density fluvo-aquic soil black soil latosol soil |
| 基金项目:国家自然科学基金青年项目（42107320）；海南省重大科技计划项目（ZDKJ2021008） |
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| 中文摘要: |
| 为更合理地理解土壤容重与土壤水分和 N2O 产生及排放的关系，本实验针对我国 3 种典型农田土壤（潮土、黑土、砖红壤），采用微宇宙静态培养的方法，在 60%土壤充水孔隙度（WFPS）条件下，设置 5个容重水平（1.0、1.1、1.2、1.3、1.4 g·cm-3），研究了在相等WFPS条件下，容重对土壤水分状况及N2O排放的影响。结果表明：在60%WFPS条件下，不同容重土壤实际水分状况差异极大。潮土在低容重（1.0、1.2 g·cm-3）时呈淹水状态，在高容重（1.3、1.4 g·cm-3）时呈通气状态；黑土在容重为1.1、1.2、1.3、1.4 g·cm-3时均呈通气状态；砖红壤水分状况受容重的影响最小，在各容重条件下均呈通气状态。潮土 N2O 排放量在容重 1.0 g·cm-3（3 268 μg·kg-1）时与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）、1.4 g·cm-3（129 μg·kg-1）时的差异显著；黑土 N2O 排放量在容重 1.0、1.1、1.2、1.3、1.4 g·cm-3时分别为 220、104、67、90、136 μg·kg-1；砖红壤 N2O 排放量在容重 1.0、1.1、1.2、1.3、1.4 g·cm-3时分别为 57、62、61、68、122 μg·kg-1，1.4 g·cm-3下与其他容重下的 N2O 排放量有显著差异。潮土在容重 1.0 g·cm-3时具有显著高于黑土和砖红壤的排放量可能是其亚硝酸盐累积和淹水状态导致。研究表明，在相同WFPS条件下，容重显著影响土壤实际水分状况及N2O排放，特别是在低碳土壤中，因此在定量WFPS对N2O排放的影响时，需对容重和质量含水量（实际水分状况）进行定量。 |
| 英文摘要: |
| 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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