农业环境科学学报2025，Vol.44Issue(4)：1126-1134,9.DOI:10.11654/jaes.2024-0257
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
摘要
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 fluvo-aquic 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.关键词
氧化亚氮/土壤水分/土壤容重/潮土/黑土/砖红壤Key words
nitrous oxide/soil moisture/soil density/fluvo-aquic soil/black soil/latosol soil分类
农业科技引用本文复制引用
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):1126-1134,9.基金项目
国家自然科学基金青年项目(42107320) （42107320）
海南省重大科技计划项目(ZDKJ2021008)National Science Fund for Distinguished Young Scholars of China(42107320) （ZDKJ2021008）
Major Science and Technology Program of Hainan Province,China(ZDKJ2021008) （ZDKJ2021008）
