摘要
为明确凹凸棒土的添加对结球甘蓝废弃物堆肥腐殖化的促进效果,以结球甘蓝废弃物和玉米秸秆为原料,分别添加质量分数为0(CK)、2.5%(T1)、5%(T2)、7.5%(T3)的凹凸棒土进行好氧堆肥,探究不同添加量的凹凸棒土对基本理化性质、有机质组分、腐殖化的影响,并结合相关性分析和结构方程模型探讨其影响腐殖化过程的途径。结果显示,凹凸棒土的添加使堆肥高温期延长了1~3 d。与CK相比,T2和T3处理的种子发芽指数分别提高了27.97%和42.06%,有机质降解率分别提高了1.67%和6.92%,腐熟状况更好。此外,与初始状态相比,堆肥结束时CK、T1、T2和T3处理的富里酸(FA)含量分别下降39.88%、42.92%、47.28%和47.68%;胡敏酸(HA)含量分别上升89.08%、129.78%、135.83%和162.50%,使得堆体芳香度增加。相关分析和结构方程表明,凹凸棒土的加入使水溶性有机碳(DOC)与腐殖质组分、前驱体的相关性发生正负转变,显示其通过影响DOC来促进HA的合成,同时还增多了显著影响HA形成的路径,促使氨基酸、还原糖和FA向HA转化,从而提高腐殖化程度。研究表明,凹凸棒土添加量为7.5%时可明显促进结球甘蓝废弃物堆肥腐熟,有效活跃前驱体,并提高腐殖质的芳香性和腐殖化程度。
This study aimed to elucidate that the addition of attapulgite promotes the humification of cabbage waste compost.Cabbage waste and corn straw were used as raw materials in this study,and attapulgite with mass fractions of 0(CK),2.5%(T1),5%(T2),and 7.5%(T3)were added to the raw materials for aerobic composting to investigate the effects on their basic physicochemical properties,organic matter components,and humification.Correlation analysis and structural equation model(SEM)were used to explore the mechanism behind the humification process.The results showed that the high temperature period of the compost was prolonged by 1–3 days with the addition of attapulgite.Seed germination index increased by 27.97%and 42.06%with better maturity and organic matter degradation rate increased by 1.67%and 6.92%in the T2 and T3 treatments,respectively,compared with CK.In addition,compared with that in the initial state,the content of fulvic acid(FA)in CK,T1,T2,and T3 decreased by 39.88%,42.92%,47.28%,and 47.68%,respectively,at the end of composting.However,the content of humic acid(HA)increased by 89.08%,129.78%,135.83%,and 162.50%,respectively,at the end of composting,which increased the aromaticity of the pile.The results of correlation analysis and SEM demonstrated that the addition of attapulgite caused a positive and negative shift in the correlation between dissolved organic carbon(DOC)and humic fractions and precursors,indicating that it promoted the synthesis of HA by affecting DOC.Simultaneously,it also increased the pathways that significantly affected the formation of HA,promoting the conversion of amino acid,reducing sugar,and FA to HA,thus enhancing the degree of humification.This study demonstrated that the addition of attapulgite at 7.5%can significantly promote the composting of cabbage waste,effectively activate precursors,and improve the aromaticity and humification of humus.
作者
朱义娟
肖红琳
刘洋廷
朱康文
杨志敏
杨红军
陈玉成
ZHU Yijuan;XIAO Honglin;LIU Yangting;ZHU Kangwen;YANG Zhimin;YANG Hongjun;CHEN Yucheng(College of Resources and Environment,Southwest University,Chongqing 400716,China;Key Laboratory of Agriculture Soil Pollution Risk Management and Control for Ecological Environment in Chongqing,Chongqing 400716,China;Chongqing Academe of Ecoenvironmental Science,Chongqing 401147,China;College of Smart City,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2023年第9期2130-2139,共10页
Journal of Agro-Environment Science
基金
重庆市科研机构绩效激励引导专项项目(Cqhky2021jxjl00001)
重庆市自然科学基金项目(CSTB2022NSCQ-MSX0538)
重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0120)
重庆市大学生创新创业训练计划项目(S202310635100)。
