生物有机物料添加对次生盐渍化土壤理化性质及细菌群落的影响

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中图分类号：S156.4 文献标志码：A 文章编号：1671-4652（2025）03-0123-09

ABSTRACT：Organic materials and microbialagents areeffective measures to eliminate secondary salinization soils.This study focused on facility vegetable soils with varying degrees of secondary salinization，and analyzed the physicochemical properties and bacterialcommunitiesof secondary salinizationsoils treated without organic mater（CK）and with bio-organic matter（straw + microbial agents），BIO，to explore the effect of BIO on the improvement of facility vegetable soils withdiferent degrees of secondary salinization.The results showed that the content of nitrate was significantly reduced and those of organic mater and ammonium were significantly increased in BIO-treated soils compared to CK treatments. Inthe BIO treatment，thediversityand richness of bacteria weresignificantlyreduced，and bacterialcommunitiesof moderately secondary salinized soils were shifted to eutrophic bacterial communities，which was mainly manifested by the increase of β Proteobacteria and Bacteroidetes.In contrast，the relative abundance of oligotrophic taxa（Acidobacteria and Chloroflexi） significantly increased in BIO-treated soils with severe secondarysalinization.Functional predictions showed thattherelative abundance of dissimilatory nitrite reduction pathway genes in moderateand severely salinized soils with BIO treatments increased by 19.79% and 56.84% ，respectively，and was significantly negatively and positively correlated withthe content of nitrate and ammonium，respectively.Thissuggests that the application of bio-organic materials mayreduce nitratecontent insalinized soils by enhancingtheconversionof nitrate toammonium，whichis more prominent in severely salinized soils.

KEYWORDs：bacterialcommunity；bioorganicmaterial;functioalprediction；secondarysalinesoil；physicochemicalproperties

近 20 年来，土壤次生盐渍化成为设施栽培农业发展面临的巨大挑战[1]。（剩余20345字）