Synergistic effect of microplastics and cadmium on microbial community and functional taxa in wheat rhizosphere soil  

作　　者：Jianhong Ji Yingying Zhong Mouliang Xiao Xianting Wang Zhi’e Hu Mianjin Zhan Jina Ding Zhenke Zhu Tida Ge 

机构地区：[1]State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products,Institute of Plant Virology,Ningbo University,Ningbo 315211,China [2]Ningbo Customs Technology Center,Ningbo 315012,China [3]State Key Laboratory of Subtropical Silviculture,College of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,China [4]Yinzhou Station of Agricultural Technical Extension,Ningbo 315100,China

出　　处：《Soil Ecology Letters》2025年第1期79-89,共11页土壤生态学快报(英文)

基　　金：supported by the Ningbo Science and Technology Bureau(Grant No.2022S103);the National Natural Science Foundation of China(Grant Nos.42107341,42307420);the UK Natural Environment Research Council and the Global Challenges Research Fund(Grant No.NE/V005871/1);the K.C.Wong Magna Fund at Ningbo University.

摘　　要：Microplastics and heavy metal contamination poses major threats to soil function and food security;however,their synergistic effects remain largely unclear.This study investigated the effects of single or combined addition of polyethylene(PE)microplastic(1%w/w)and cadmium(Cd;1.5 and 5 mg kg–1)on functional microbial communities in the wheat rhizosphere soil.We observed that the biomass of wheat increased by 142.44%under high doses of Cd addition.The bacterial alpha diversity in wheat bulk soil reduced by 37.34%–37.83%with the combined addition of microplastic and Cd.The addition of microplastic reduced the relative abundance of Proteus involved in nitrogen fixation by 19.93%,while the relative abundance of Proteus and Actinobacteria involved in nitrogen cycling increased with the increase of Cd concentration,increasing by 27.96%–37.37%and 51.14%–55.04%,respectively.FAPROTAX analysis revealed that increasing Cd concentration promoted the abundance of functional bacterial communities involved in nitrification/denitrification and nitrate/nitrite respiration in rhizosphere soil.A FunGuild analysis showed that the synergy of PE-microplastics and Cd increased the abundance of saprophytic fungi,suggesting an enhanced degradation function.Our findings provide new knowledge on the effects of microplastics and heavy metals on soil microorganisms and functional microbial communities in agricultural soil.

关 键 词：microplastics CADMIUM bacteria and fungi microbial function taxa 

分 类 号：S15[农业科学—土壤学]