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Thermal stability of soil organic carbon after long-term manure application across land uses and tillage systems in an oxisol
Catena ( IF 6.2 ) Pub Date : 2021-01-22 , DOI: 10.1016/j.catena.2021.105164
Matheus Sampaio C. Barreto , Marlon Ramlogan , Dener Marcio S. Oliveira , Ernst Eduard J. Verburg , Evert J. Elzinga , Ashaki A. Rouff , Martin Jemo , Luís Reynaldo F. Alleoni

The pool of carbon (C) present in soil systems is larger than the amount of organic C stored in living biomass and the atmosphere. Soil degradation has increased soil C emissions at the expense of C accumulation. Climate-smart management practices may be adapted to increase C sequestration as soil organic carbon (SOC). To avoid the SOC loss, different strategies have been applied, including no-tillage and organic fertilizer. Here, we investigated thermal stability of SOC after long-term manure application across land uses and tillage systems in weathered soils of Brazil. We chose five commercial areas with different land uses: pasture with swine manure (SM) application (PA + SM), conventional tillage (CT) with SM application (CT + SM), natural vegetation (NV), no-tillage with SM application (NT + SM), and no-tillage (NT). Thermal analysis revealed that SOC oxidation and CO2 emission started around 240 °C, close to gibbsite and goethite structural collapse, suggesting preferential adsorption of SOC onto these minerals. Approximately 50% of SOC for all sites was oxidizable at lower temperature (~315 °C) which suggests the prevalence of polysaccharides, decarboxylation of acidic groups and dehydration of hydroxylate aliphatic structures, regardless of land-use. The energy content of SOC for NV (6.5) and PA + SM (10.6) were in average, 46% lower than other treatments which suggest a higher necromass contribution to SOC in these systems. However, the higher energy content in CT + SM (14.9), NT + SM (16.5), and NT (15.8), suggests a higher contribution of plant-derived compounds in SOC. Our results showed that SM application on pastureland reached similar SOC accumulation to NV and increment of ~33% when applied to no-till system. We conclude that SM could a drive higher C accumulation and stabilization if preferentially associated to soil conservative system.



中文翻译:

长期在土壤中使用有机肥和耕作系统中的有机肥后,土壤有机碳的热稳定性

土壤系统中存在的碳(C)池大于活生物量和大气中存储的有机C量。土壤退化以增加碳的积累为代价,增加了土壤的碳排放量。可以采用气候智能管理方法来增加碳固存作为土壤有机碳(SOC)的量。为了避免SOC损失,已采用了不同的策略,包括免耕和有机肥。在这里,我们调查了巴西风化土壤中长期施用的肥料在土壤和耕作系统之间的热稳定性。我们选择了五个具有不同土地用途的商业区:使用猪粪(SM)的牧场(PA + SM),使用SM的常规耕作(CT)(CT + SM),自然植被(NV),使用SM的免耕(NT + SM)和免耕(NT)。2排放开始于240°C左右,接近三水铝铁矿和针铁矿结构塌陷,表明SOC优先吸附在这些矿物上。在较低的温度(约315°C)下,所有位点的SOC约有50%可氧化,这表明多糖的流行,酸性基团的脱羧和羟基化脂族结构的脱水,与土地用途无关。NV(6.5)和PA + SM(10.6)的SOC能量含量平均较低,比其他治疗方法低46%,这表明这些系统中坏死对SOC的贡献更大。但是,CT + SM(14.9),NT + SM(16.5)和NT(15.8)中较高的能量含量表明,植物来源的化合物在SOC中的贡献更大。我们的研究结果表明,在免耕系统上,SM在牧场上的SOC累积量与NV相似,并且增加了〜33%。我们得出的结论是,如果优先与土壤保守系统相关联,SM可以驱动更高的C积累和稳定。

更新日期:2021-01-24
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