不同土地利用方式对宁夏盐渍化土壤细菌群落的影响
投稿时间:2021-08-05  修订日期:2021-09-16  点此下载全文
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作者单位邮编
李明 宁夏大学食品与葡萄酒学院
宁夏大学葡萄与葡萄酒研究院 
750021
马飞 宁夏大学 750021
陈晓娟 宁夏大学 750021
王锐 宁夏大学农学院 750021
基金项目:国家自然科学(41967040);宁夏自然科学基金项目(2021AAC03090)
中文摘要:为了解盐渍化土壤不同的利用方式对土壤细菌群落结构的影响,本研究选取盐渍化荒地(CK)、水旱轮作12年玉米地(PD12Y)、连续种植水稻12年(P12Y)、水旱轮作12年水稻地(DP12Y)以及连续种植玉米12年(D12Y)的土壤,利用Illumina Hiseq高通量测序技术解析了不同种植年限土壤细菌的群落结构特征,并分析了土壤理化因子与细菌群落结构的关系。结果表明:变形菌门是所有土壤中最为优势的菌群,占21.25%—46.87%。其次为芽单胞菌门,占7.10%—25.36%,其丰度在盐渍化荒地(CK)处理组最高,为25.36%,较其他处理组高出96.28%—257.18%(P<0.05);第3大优势菌门为放线菌门,占5.30%—18.87%,放线菌门在CK中为最高,高出其他处理组105.00%—261.51%(P<0.05)。在属水平上,由于土地利用方式变化,盐渍化土壤中耐盐性的Salinimicrobium、unidentified_Actinomarinales和Candidatus_Entotheonella等显著下降(P<0.05)。土壤理化性质测定结果表明:全氮、碱解氮、全磷在PD12Y和D12Y处理中最高,其中碱解氮在D12Y处理中显著高于其他处理组(P<0.05),全磷在PD12Y处理组最高(P<0.05)。速效磷在PD12Y处理组中显著高于其他处理组(P<0.05)。同时,土壤pH(P<0.05)、电导率值、含水量在PD12Y处理组最低。冗余分析(dbRDA)与Spearman相关性分析结果表明,土壤含水量和总氮是影响细菌群落结构的主要因子。
中文关键词:盐渍化土壤  不同土地利用方式  细菌群落  土壤理化性质
 
Effects of Different Land Use Patterns on Bacterial Communities in Salinized Soils in Ningxia
Abstract:In order to understand the change characteristics of soil bacterial community structure and soil physical and chemical properties caused by land uses in salinized soil, this study selected CK (Original salinized soil0, PD12Y (Continuous rotation of rice and corn for 12 years (Corn)), P12Y (Rice continuous cultivation for 12 years), DP12Y (Continuous rotation of rice and corn for 12 years (rice)), D12Y (Continuous corn for 12 years). Illumina HiSeq high-throughput sequencing technology was used to analyze the characteristics of soil bacterial community structure in different planting years of maize (D12Y), and the relationship between soil physical and chemical factors and bacterial community structure was analyzed. The results showed that Proteobacteria was the most dominant flora in all soils, accounting for 21.25% ~ 46.87%. The second most dominant bacteria group was Blastomonas, accounting for 7.10% ~ 25.36%. Its abundance in the salinized wastelands (CK) treatment group was 25.36%, 96.28%~257.18% higher than that in other treatment groups (P<0.05). The third most dominant phyla were Actinobacteria, accounting for 5.30%~18.87%, and the relative abundance of Actinobacteria was the highest in CK, 105.00% ~ 261.51% higher than other treatment groups (P<0.05). At the genus level, Salinimicrobium, unidentified_Actinomarinales and Candidatus_entotheonella of salt-tolerant soils were significantly decreased by different land use salinization methods (P<0.05). The results of soil physical and chemical properties showed that total nitrogen, alkali-hydrolyzed nitrogen and total phosphorus were the highest in PD12Y and D12Y treatments, and alkali-hydrolyzed nitrogen in D12Y treatment was significantly higher than that in other treatment groups (P<0.05), and total P in PD12Y treatment group was the highest (P<0.05). The available P in PD12Y treatment group was significantly higher than that in other treatment groups (P<0.05). At the same time, soil pH (P<0.05), electrical conductivity and water content were the lowest in PD12Y treatment group. Redundancy analysis (dbRDA) and Spearman correlation analysis showed that soil water content and total nitrogen were the main factors affecting the bacterial community structure.
keywords:salinized soil  different land use patterns  bacterial community  physiochemical properties of soil
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