添加黄土或古土壤降低猪粪温室气体综合排放效应

为了探究加土垫圈这一传统措施对控制畜禽粪便存贮过程中温室气体排放的作用,采用室内培养方法研究了添加黄土与古土壤对猪粪温室气体排放的影响及可能的作用机理。结果表明:与猪粪处理相比,添加黄土或古土壤处理的CO_2累积排放量降低了42.4%～64.3%,CH_4累积排放量降低了99.8%以上,但N_2O累积排放量增加了1.8～18.0倍,这与土壤对养分的保蓄作用及土壤添加后碳、氮底物的变化有关。总体而言,添加黄土或古土壤处理的全球增温潜势为猪粪对照的38.1%～67.0%,有效减少了猪粪的温室气体排放。与施用黄土相比,添加古土壤具有更好的减排效果,这与古土壤中具有吸附能力的物理性黏粒和游离态氧化铁含量较高有关,说明添加物类型的选择对减少畜禽粪便存贮阶段的温室气体排放具有重要作用。

Addition of loess or paleosol reduces greenhouse gas emissions from pig manure

Manure storage is an important process that influences greenhouse gas emissions when considering manure management practices. In order to better understand the possible mechanisms of adding loess to livestock housing and its effects on greenhouse gas emissions, an incubation experiment was carried out to study the effects of adding loess and paleosol to pig manure. The results showed that the cumulative release of CO₂ and CH₄ decreased by 42.4%~64.3% and by more than 99.8%, respectively. Compared to the control(pig manure without the addition of loess or paleosol), the loess and paleosol treatments show a 1.8 to 18.0-fold reduction in the cumulative N₂O emissions because of their soil retention abilities and dilution effects. The global warming potential of loess or paleosol treatments was approximately 38.1%~67.0%, compared to that of the control, indicating an effective reduction in greenhouse gas emissions. When compared to the loess treatment, the paleosol treatment had a greater effect on emission reduction owing to the higher content of physical clay and free iron oxide present in paleosol. We conclude that the selection of a suitable additive has an important impact on greenhouse gas emissions during manure storage.