Masmoudi Saoussan, Abid Wadii, Medhioub Khaled, Ammar Emna
Preparatory Institute of Engineering Studies in Sfax, Laboratory of Environmental Sciences and Sustainable Development (LASED), University of Sfax, B.P. 805 - 3018, Sfax, Tunisia.
National Engineering School of Sfax, University of Sfax, B.P. 1173 - 3038, Sfax, Tunisia.
Heliyon. 2024 Aug 17;10(16):e36456. doi: 10.1016/j.heliyon.2024.e36456. eCollection 2024 Aug 30.
The compost effects on soil organic matter (SOM) stability were evaluated. Manure at 10 % ratio and compost at 10 %, 20 % and 40 % ratios (v/v) were added to the soil and their effects were compared to unamended control soil after 90-days of greenhouse-experiment. Humic acids (HA) and fulvic acids (FA) were extracted from two different soil-sample layers at 0-15 and 15-30 cm depth. The C/C ratio and the humification parameters were determined, and the soil-HA were characterized by spectroscopic methods (E/E and FTIR). The humification parameters progress with time were affected by the amendment concentration. After 90 days, the treated soils HA' FTIR spectra showed an increase in aromatic carbon polycondensation and O-containing groups reflecting the high degrees of molecular associations and humification of soil HA. Compared to 10 % manure application and 40 % compost ratio use, the applications of 10 % and 20 % compost ratios induced higher humification level and highly oxidized HA structure. Moreover, changes in the HA compositional and functional groups were noticed at the upper layer which exhibited higher reactivity compared to the lower layer which displayed more humified SOM. Through the humification process, the HA fraction was improved to reach more stable and complex macromolecules, where aromatic structures were bio-converted into highly functionalized compounds.
评估了堆肥对土壤有机质（SOM）稳定性的影响。将比例为10%的粪肥以及比例为10%、20%和40%（体积/体积）的堆肥添加到土壤中，在温室试验90天后，将它们的效果与未改良的对照土壤进行比较。从0 - 15厘米和15 - 30厘米深度的两个不同土壤样品层中提取腐殖酸（HA）和富里酸（FA）。测定了C/C比和腐殖化参数，并用光谱方法（E/E和FTIR）对土壤HA进行了表征。腐殖化参数随时间的变化受改良剂浓度的影响。90天后，处理过的土壤HA的FTIR光谱显示芳香碳缩聚和含氧基增加，反映了土壤HA的高度分子缔合和腐殖化程度。与施用10%粪肥和40%堆肥比例相比，施用10%和20%堆肥比例诱导了更高的腐殖化水平和更高氧化程度的HA结构。此外，在上层观察到HA组成和官能团的变化，与显示更多腐殖化SOM的下层相比，上层表现出更高的反应性。通过腐殖化过程，HA组分得到改善，形成更稳定、更复杂的大分子，其中芳香结构被生物转化为高度官能化的化合物。
