Impacts of reclamation on salinization desert soil microbial community： a case study of Alar oasis
Received date: 2021-04-09
Revised date: 2021-06-29
Online published: 2021-12-17
Recently， human activities characterized by reclamation and cultivation accelerated oasisization of drylands in the northwest China. However， it is still unclear about how such land use changes impact characteristics of soil microbial communities in saline-alkaline desert. By using qPCR and Illumina Miseq high-throughput amplicon sequencing technologies， we conducted a comparative study on soil fungal， bacterial and archaeal community biomasses， diversities and structures in a 5-year-old cotton farmland soil （FS） and an adjacent natural desert soil （ND） in Alar oasis of Xinjiang province. The results showed that： （1）reclamation significantly increased bacterial and fungal biomasses， and decreased archaeal biomass based on qPCR estimation. While most bacterial diversity indices significantly increased and archaeal Shannon index decreased due to reclamation， fungal diversity indices were not significantly changed. （2） An unique microbial community different from other arid desert ecosystem inhabited in the salinization desert. Reclamation significantly changed soil bacterial， archaeal and fungal community structures. Especially， the relative abundances of Actinobacteria， Chloroflexi， Acdiobacteria， Saccharibacteria and Nitrosipirae bacteria， Woesearchaeota_DHVEG-6 archaea and Blastocladiomycota fungi in FS significantly increased， while that of Nanohaloarchaeota archaea significantly decreased compared to that in ND. Soil electrical conductivity （EC）， total organic C（TOC）， total N（TN）， total P （TP） and available P （AP） were the key factors in determining bacterial community structure， vegetation coverage， aboveground biomass and richness， TP and AP were the key factors in shaping archaeal community structure， and EC was the key factors in structuring fungal community. In conclusion， oasisization due to recalmation divergently shifted characteristics of soil microbial community in salinization desert mainly due to changes in virginal vegetation， soil EC， TOC and TN and chemical fertilizers use， therein bacterial community showed the highest sensitivity to reclamation， while archaeal and fungal diversity and structure were relatively stable.
Key words： reclamation; desert; high-throughput sequencing; soil microbes; community structure
Yani Wang , Yigang Hu , Zengru Wang , Changsheng Li . Impacts of reclamation on salinization desert soil microbial community： a case study of Alar oasis[J]. Journal of Desert Research, 2021 , 41(6) : 126 -137 . DOI: 10.7522/j.issn.1000-694X.2021.00079
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