College of Life Science, Northeast Agricultural University, Harbin, 150030, China.
Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, Tianjin, 300387, China.
J Environ Manage. 2023 Dec 1;347:119188. doi: 10.1016/j.jenvman.2023.119188. Epub 2023 Oct 4.
The humic acid (HA) possesses a more recalcitrant structure, making it crucial carbon components that improve carbon sequestration. Moreover, ferrous ions could improve microbial activity and enhance compost humification, and their oxidation into iron oxides could adsorb carbon components for sequestration. Based on the advantages of low cost and easy availability of ferrous sulfate (FeSO4), this study investigated the effect of FeSO on carbon sequestration during composting. Chicken manure (CM) and food waste (FW) composting were carried out in four treatments, namely control (CM, FW) and 5% (w/w) FeSO treated groups (CM+, FW+). Results indicated that FeSO4 increased HA content, improved organic carbon stability. Carbon loss for CM, CM+, FW and FW + treatments were 48.5%, 46.2%, 45.0%, and 40.3%, respectively. Meanwhile, FeSO enhanced the function of bacterial taxa involved in HA synthesis in CM + treatment, and improved the number of core bacteria significantly associated with formation of HA and iron oxide. SEM analysis verified that role of FeSO4 was significant in promoting HA synthesis during CM + composting, while it was remarkably in enhancing HA sequestration during FW + composting. This article provided fundamental theoretical backing for enhancing HA production and improving carbon sequestration during different materials composting.
腐殖酸（HA）具有更顽固的结构，是提高碳封存的关键碳组分。此外，亚铁离子可以提高微生物活性，增强堆肥腐殖化，而将其氧化成氧化铁可以吸附碳组分进行封存。基于硫酸亚铁（FeSO4）成本低、易得的优势，本研究探讨了 FeSO4 对堆肥过程中碳封存的影响。鸡粪（CM）和厨余垃圾（FW）在四个处理中进行堆肥，分别为对照（CM、FW）和 5%（w/w）FeSO4 处理组（CM+、FW+）。结果表明，FeSO4 增加了 HA 含量，提高了有机碳稳定性。CM、CM+、FW 和 FW+处理的碳损失分别为 48.5%、46.2%、45.0%和 40.3%。同时，FeSO4 增强了 CM+处理中参与 HA 合成的细菌类群的功能，显著增加了与 HA 和氧化铁形成显著相关的核心细菌数量。SEM 分析验证了 FeSO4 在促进 CM+堆肥中 HA 合成中的重要作用，同时在 FW+堆肥中显著增强了 HA 封存作用。本文为不同材料堆肥中提高 HA 产量和增强碳封存提供了基础理论支持。
