期刊
FRONTIERS IN MICROBIOLOGY
卷 14, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2023.1291962
关键词
long-term drip irrigation; saline-alkali soil; bacterial community; null model; assembly processes
类别
This study examined the effects of the length of time that drip irrigation (DI) lasts on soil bacterial diversity and community assembly process. The results showed that long-term DI reduced soil salinity and increased soil bacterial diversity, while also affecting the bacterial community structure. Soil salinity was found to be the primary factor influencing the bacterial community assembly process.
Identifying the potential factors associated with the impact of long-term drip irrigation (DI) on soil ecosystems is essential for responding to the environmental changes induced by extensive application of DI technology in arid regions. Herein, we examined the effects of the length of time that DI lasts in years (NDI) on soil bacterial diversity as well as the soil bacterial community assembly process and the factors influencing it. The results showed that long-term DI substantially reduced soil salinity and increased soil bacterial diversity while affecting the soil bacterial community structure distinctly. Null model results showed that the soil bacterial community assembly transitioned from stochastic processes to deterministic processes, as NDI increased. Homogeneous selection, a deterministic process, emerged as the dominant process when NDI exceeded 15 years. Both random forest and structural equation models showed that soil salinity was the primary factor affecting the bacterial community assembly process. In summary, this study suggested that soil bacteria respond differently to long-term DI and depends on the NDI, influencing the soil bacterial community assembly process under long-term DI.
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