生物电流对可降解地膜释放有机质光谱特征的影响  

Effects of biocurrent on spectral characteristics of organic matter released from degradable mulch film

作　　者：杨品品 魏晓贺 石昌文 张晓林 李晓晶 YANG Pinpin;WEI Xiaohe;SHI Changwen;ZHANG Xiaolin;LI Xiaojing(Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs/Key Laboratory of Original Agro-Environmental Pollution Prevention and Control,MARA/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety,Tianjin 300191,China;College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China)

机构地区：[1]农业农村部环境保护科研监测所/农业农村部产地污染防控重点实验室/天津市农业环境与农产品安全重点实验室,天津300191 [2]华中农业大学资源与环境学院,武汉430070

出　　处：《农业环境科学学报》2025年第3期665-674,共10页Journal of Agro-Environment Science

基　　金：中国农业科学院科技创新工程基础科学研究中心项目(CAAS-BRC-GLCA-2023-02);国家自然科学基金项目(42477041);中国博士后科学基金面上项目(2024-bshjj-ypp)。

摘　　要：为研究生物电流强化降解可生物降解塑料地膜(Biodegradable mulching films,BDMs)过程对可溶性有机质(Dissolved organic matter,DOM)的影响,并明确生物电流对塑料降解源DOM释放过程的调控作用,对3种BDMs进行生物电流强化及光照老化降解实验。结果发现:加入不同地膜的微生物电化学系统(Microbial electrochemical systems,MES)均能输出一定的电压,双色膜处理的输出电压最高,白色地膜处理的输出电压最低,且稳定性较差;另外,紫外照射对不同塑料处理的产电性能均有激发效应。对DOM的三维荧光光谱分析发现MES可以显著降低DOM浓度,消减率达到60%。生物电流能加速BDMs的降解并改变DOM的组成和含量。不同地膜处理的MES出水中DOM与无电极处理相比荧光峰范围、峰位置和荧光强度发生明显变化,MES促进了腐殖质类物质向类络氨酸蛋白类物质转变。本研究揭示了生物电流在DOM转化过程中的关键作用,微生物代谢产生的生物电流会促进DOM的分子结构重组及其转化过程。In order to study the effect of biocurrent on dissolved organic matter(DOM)in the process of biocurrent enhanced degradation of biodegradable mulching films(BDMs),and to clarify the regulatory effect of biocurrent on the release process of DOM from plastic degradation sources,biocurrent enhanced and photoaging degradation experiments were carried out on three kinds of BDMs.The results showed that the microbial electrochemical systems(MES)with different mulches could output a certain voltage.The output voltage of two-color mulches was the highest,and the output voltage of white mulches was the lowest,and the stability was poor.In addition,UV irradiation has an exciting effect on the electrical performance of different plastic treatments.The three-dimensional fluorescence spectrum analysis of DOM in effluent showed that MES could significantly reduce the concentration of DOM,and the reduction rate reached 60%.Biocurrent can accelerate the degradation of BDMs and change the composition and content of DOM.The fluorescence peak range,peak position and fluorescence intensity of DOM in the effluent of MES treated with different plastic films changed significantly compared with that without electrode,and MES promoted the transformation of humus substances to tyrolinoid proteins.This study reveals the key role of biocurrent in DOM transformation,and the biocurrent generated by microbial metabolism will promote the molecular structure reorganization of DOM and its transformation process.

关 键 词：可降解地膜 可溶性有机质 电子传递 微塑料 微生物电化学 

分 类 号：X71[环境科学与工程—环境工程]