State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China.
State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, PR China.
J Environ Manage. 2023 Oct 15;344:118453. doi: 10.1016/j.jenvman.2023.118453. Epub 2023 Jun 22.
Additives were widely investigated to retain the nutrients and mitigate the greenhouse gas emissions (GHGs) during manure composting. However, the sustained effects of additives on the GHGs emissions following incorporation of composts to soil were scarcely explored. This study evaluated the effects of bentonite added at the beginning of pig manure composting on the GHGs emissions during two successive processes, i.e., composting and soil incubation amended with composting products. Addition of bentonite did not hinder the composting process and alter the total CO emission. On the other hand, reduction by about 17% and 29% for CH and NO emission, respectively, was achieved in the presence of bentonite during composting. Incorporation of the final composting products to soil enhanced significantly the soil C and N of various forms, and gas emissions of CO and NO. However, no significant differences were observed between bentonite-manure co-compost and manure-only compost application except for the NO emission. Compared to the manure-only compost, compost amended with bentonite reduced NO loss by around 6.8%, but not statistically significant. This study confirmed that addition of bentonite at the composting stage can mitigate the GHGs emission considering both composting and compost application stages, with all reductions occurring at the composting stage.
添加剂被广泛研究用于在粪便堆肥过程中保留营养物质并减少温室气体排放（GHGs）。然而，添加剂对堆肥施入土壤后温室气体排放的持续影响却鲜有研究。本研究评估了在猪粪堆肥开始时添加膨润土对两个连续过程（即堆肥和用堆肥产品进行土壤孵育）中 GHGs 排放的影响。添加膨润土并没有阻碍堆肥过程，也没有改变总 CO 的排放。另一方面，在堆肥过程中添加膨润土可分别减少 CH 和 NO 排放约 17%和 29%。将最终的堆肥产品施入土壤可显著提高土壤中各种形式的 C 和 N 以及 CO 和 NO 的气体排放。然而，除了 NO 排放外，膨润土-粪便共堆肥和仅用粪便堆肥的应用之间没有观察到显著差异。与仅用粪便堆肥相比，添加膨润土的堆肥可减少约 6.8%的 NO 损失，但没有统计学意义。本研究证实，在堆肥阶段添加膨润土可以减轻温室气体排放，同时考虑堆肥和堆肥应用两个阶段，所有减少都发生在堆肥阶段。
