[Bacterial Community Structure and Functional Characteristics of Soil in Carex Tussock Marsh Wetland with Different Degradation Levels].

Q2 Environmental Science
Miao-Miao Zhang, Man-Yin Zhang, Jing Li, Li-Juan Cui, Zi-Liang Guo, Wei-Wei Liu, He-Nian Wang, Da-An Wang
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引用次数: 0

Abstract

To explore the characteristics and influencing factors of soil bacterial communities in degraded marsh wetlands, we divided the Carex tussock marsh wetland in northeast China into three degradation degrees: non-degraded (ND), mildly degraded (LD), and heavily degraded (HD). High-throughput sequencing technology and PICRUSt bacterial function prediction tools were used. We analyzed the soil environmental characteristics and soil microbial community structure characteristics of degraded wetlands and explored the influencing factors of microbial changes in degraded wetlands. The results showed that: ① The soil pH value was generally neutral to alkaline in general. With increasing degrees of degradation, the contents of soil organic carbon, total nitrogen, total carbon, and zinc decreased significantly (P<0.05), while the content of total potassium increased significantly (P<0.05). ② The dominant bacterial groups included Proteobacteria, Acidobacteriota, and Gemmatimonadota in the degraded wetlands. ③ The Alpha diversity of soil bacterial communities increased significantly with the increases in wetland degradation degree (P<0.05), and there was a significant difference between degraded (LD and HD) and non-degraded (ND) wetlands in bacterial community composition.④ From the perspective of bacterial community functions, the primary metabolic functions, such as metabolism, genetic information processing, cellular processes, and environmental information processing, were significantly weakened with the increasing degree of degradation (P<0.05). The main secondary functions such as amino acid metabolism, carbohydrate metabolism, biodegradation, and metabolism of exogenous substances were significantly weakened (P<0.05). ⑤ Pearson correlation analysis showed that the change in soil bacterial Alpha diversity was significantly correlated with the contents of soil total nitrogen, total carbon, and organic carbon and the physical characteristics (diameter, height, and number) of Carex hummocks (P<0.05). RDA results showed that pH value was a key factor affecting soil bacterial community structure in the degraded wetland (P<0.05). The functional differences of bacterial communities were mainly affected by the contents of soil total iron and zinc (P<0.05). In conclusion, soil physical and chemical properties, bacterial community diversity and structure, and bacterial community function changed regularly with the degree of degradation. Soil pH; contents of total nitrogen, total carbon, and organic carbon; and physical characteristics of Carex tussock were the key factors affecting the microbial community in the degraded wetland, which can provide the scientific basis for understanding the degradation and restoration processes of Carex marsh ecosystems.

不同退化程度的苔草沼泽湿地土壤细菌群落结构与功能特征[j]。
为探讨退化沼泽湿地土壤细菌群落特征及其影响因素,将东北毛蕊草湿地划分为未退化(ND)、轻度退化(LD)和重度退化(HD) 3种退化程度。采用高通量测序技术和PICRUSt细菌功能预测工具。分析了退化湿地土壤环境特征和土壤微生物群落结构特征,探讨了退化湿地微生物变化的影响因素。结果表明:①土壤pH值总体上为中性至碱性。随着退化程度的增加,土壤有机碳、全氮、全碳和锌含量显著降低(P<0.05),全钾含量显著升高(P<0.05)。②退化湿地的优势菌群为变形菌门(Proteobacteria)、酸性菌门(Acidobacteriota)和双胞菌门(Gemmatimonadota)。③随着湿地退化程度的增加,土壤细菌群落的α多样性显著增加(P<0.05),退化湿地(LD和HD)与未退化湿地(ND)的细菌群落组成差异显著。④从细菌群落功能来看,随着降解程度的增加,代谢、遗传信息处理、细胞过程和环境信息处理等主要代谢功能显著减弱(P<0.05)。氨基酸代谢、碳水化合物代谢、生物降解和外源物质代谢等主要次生功能显著减弱(P<0.05)。⑤Pearson相关分析表明,土壤细菌α多样性的变化与土壤全氮、全碳和有机碳含量以及苔草丘的物理特征(直径、高度和数量)呈显著相关(P<0.05)。RDA结果表明,pH值是影响退化湿地土壤细菌群落结构的关键因素(P<0.05)。细菌群落功能差异主要受土壤全铁和全锌含量的影响(P<0.05)。综上所述,土壤理化性质、细菌群落多样性和结构、细菌群落功能随降解程度有规律变化。土壤pH值、全氮、全碳和有机碳含量以及毛蕊草丛的物理特性是影响退化湿地微生物群落的关键因素,为理解毛蕊草湿地生态系统的退化和恢复过程提供了科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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