Straw retention efficiently improves fungal communities and functions in the fallow ecosystem

BMC Microbiology

Zichu Zhang¹  Zhaoli Lin²  Muhammad Tayyab²  Caifang Zhang²  Nyumah Fallah²  Youxiong Que²  Hua Zhang²  Shiyan Li²  Jun Luo²  Ahmad Yusuf Abubakar² 

[1] Fuzhou No.8 High School, 350000, Fuzhou, China;Key Laboratory of Sugarcane Biology and Genetic Breeding, Ministry of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China;College of Agriculture, Fujian Agriculture and Forestry University, 350002, Fuzhou, China;

关键词: Sugarcane straw retention;    Soil profile;    Fungal community;    Network analysis;    FUNGuild analysis;   

DOI  :  10.1186/s12866-021-02115-3

来源: Springer

【 摘 要 】

BackgroundStraw retention is a substitute for chemical fertilizers, which effectively maintain organic matter and improve microbial communities on agricultural land. The purpose of this study was to provide sufficient information on soil fungal community networks and their functions in response to straw retention. Hence, we used quantitative real-time PCR (qRT-PCR), Illumina MiSeq (ITS rRNA) and FUNGuild to examine ITS rRNA gene populations, soil fungal succession and their functions under control (CK) and sugarcane straw retention (SR) treatments at different soil layers (0–10, 10–20, 20–30, and 30–40 cm) in fallow fields.ResultThe result showed that SR significantly enhanced ITS rRNA gene copy number and Shannon index at 0–10 cm soil depth. Fungi abundance, OTUs number and ACE index decreased with the increasing soil depth. The ANOSIM analysis revealed that the fungal community of SR significantly differed from that of CK. Similarly, significant difference was also observed between topsoil (0–20 cm) and subsoil (20–40 cm). Compared with CK, SR decreased the relative abundance of the pathogen, while increased the proportion of saprotroph. Regarding soil depth, pathogen relative abundance in topsoil was lower than that in subsoil. Besides, both sugarcane straw retention and soil depths (topsoil and subsoil) significantly altered the co-occurrence patterns and fungal keystone taxa closely related to straw decomposition. Furthermore, both SR and topsoil had higher average clustering coefficients (aveCC), negative edges and varied modularity.ConclusionsOverall, straw retention improved α-diversity, network structure and fungal community, while reduced soil pathogenic microbes across the entire soil profile. Thus, retaining straw to improve fungal composition, community stability and their functions, in addition to reducing soil-borne pathogens, can be an essential agronomic practice in developing a sustainable agricultural system.

【 授权许可】

CC BY