雅鲁藏布江下游沿岸湿地建群种植物根际土壤细菌群落结构和多样性特征
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浙江省科技厅公益性项目(LGN18C030002)


Structure and diversity of bacterial community in rhizosphere soil of four dominant species along the bank of the lower reaches of Yarlung Zangbo River
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    摘要:

    了解雅鲁藏布江大峡谷沿岸不同植被根际土壤细菌群落结构和多样性特征对于揭示该区植被与土壤的相互作用具有重要科学意义。采用Illumina Miseq高通量测序技术,研究了雅鲁藏布江沿岸自然分布和生长的艾草Artemisia argyi H.Lév.&Vaniot、白刺花Sophora davidii(Franch)、八宝Hylotelephium erythrostictum(Miq.) H.Ohba、黄刺玫Rosa xanthina Lindl 4种典型植被根际土壤细菌群落结构和多样性,并结合植物根际土壤养分含量进行相关性分析。雅鲁藏布江沿岸4种植物根际土壤中共有28门、84纲、156目、262科、599属土壤细菌,其中变形菌门、酸杆菌门、放线菌门是雅鲁藏布江岸边植物根际土壤的优势菌群,相对丰度较高,其次为拟杆菌门、芽单胞菌门、疣微菌门。在门水平上,4种植物根际土壤细菌的群落结构组成表现为黄刺玫和艾草相似,而八宝和另外三种植物相差较大。土壤细菌OTUs (操作分类单元)数和Chaol均以艾草为最高,其值分别是6695和8000.02,以白刺花为最低,其值分别是4563和5113.66。根际土壤细菌多样性指数以黄刺玫为最高,而以白刺花为最低。雅鲁藏布江江岸植被根际土壤细菌物种组成丰富,4种典型植物根际土壤细菌在门水平和纲水平上结构相似,但部分菌群相对丰度差异明显。各植物根际土壤细菌共有的OTU比率较低,而各植物特有的OTU比率则以黄刺玫根际土壤为最高,其次是艾草根际土壤,而以八宝根际土壤为最低。土壤pH、土壤含水量、土壤有机质和总氮含量是影响建群种植物根际土壤优势细菌的主要因素。研究结果可为青藏高原高寒生态系统的稳定和保护提供理论依据。

    Abstract:

    It is very important to reveal the interaction between vegetation and soil by studying the bacterial community structure and diversity of rhizosphere soil of different vegetations along the Yarlung Zangbo River Grand Canyon. The aim of this study was to investigate the bacteria community structure and diversity of rhizosphere soil of four dominant plant species:Artemisia argyi, Sophora davidii, Hylotelephium erythrostictum and Rosa xanthine, growing in band slope of the lower reaches of Yarlung Zangbo River based on Miseq2500 high throughout sequencing technique and the correlation analysis of bacterial community structure with chemical properties. The results showed that there were 28 phyla, 84 classes, 156 orders, 262 families, and 599 genera in the rhizosphere soil of the four plants. Proteobacteria, Acidobacteria and Actinobacteria were found to be the dominant bacteria taxa, next to Bacteroidetes, Gemmatimonadetes and Verrucomicrobia. The soil bacteria community structure of Sophora davidii was more similar to Artemisia argyi at phylum level, while that of Hylotelephium erythrostictum was different from other three plants significantly. The OTU(Operational taxonomic units) numbers and chao1 index of the rhizosphere soil bacteria of Artemisia argyi were 6695 and 8000.02, respectively, which were the highest among the four plants, and that of Sophora davidii were the lowest with 4563 and 5113.66, respectively. The bacterial structures in rhizosphere soil of the four plants were similar, but there was a significant difference in the relative abundance of some bacteria at the phylum and class levels. There were lower proportion of common OTUs, while there existed higher proportion of unique OTUs in each sample in soil bacteria of rhizosphere soil collected from the four plants. The soil pH, soil water contents, soil organic matters and soil total nitrogen were the main influencing factors for dominant bacteria in rhizosphere soil of the four dominant plant species growing along the bank of the lower reaches of Yarlung Zangbo river. The study provided a theoretical basis for the vegetable restoration and sustainable development in alpine wetland ecosystem in the Qinghai-Tibetan plateau.

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陈海生,刘守平,杨万勤,梁国钱.雅鲁藏布江下游沿岸湿地建群种植物根际土壤细菌群落结构和多样性特征.生态学报,2022,42(4):1527~1537

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