Composition and diversity of microbial communities in high-altitude karst soil

XIAREKEYAMU·Yitiniyazi; DONG Faqin; LI Qiongfang; AN Dejun; DAI Qunwei; ZHANG Qiang; RAO Hanyun; REN Yazhen; LIU Fengqi; LIU Mingxue

doi:10.11932/karst2024y015

Volume 43 Issue 2

Apr. 2024

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XIAREKEYAMU·Yitiniyazi, DONG Faqin, LI Qiongfang, AN Dejun, DAI Qunwei, ZHANG Qiang, RAO Hanyun, REN Yazhen, LIU Fengqi, LIU Mingxue. Composition and diversity of microbial communities in high-altitude karst soil[J]. CARSOLOGICA SINICA, 2024, 43(2): 364-378. doi: 10.11932/karst2024y015

Citation:

XIAREKEYAMU·Yitiniyazi, DONG Faqin, LI Qiongfang, AN Dejun, DAI Qunwei, ZHANG Qiang, RAO Hanyun, REN Yazhen, LIU Fengqi, LIU Mingxue. Composition and diversity of microbial communities in high-altitude karst soil[J]. CARSOLOGICA SINICA, 2024, 43(2): 364-378. doi: 10.11932/karst2024y015

Citation:

XIAREKEYAMU·Yitiniyazi, DONG Faqin, LI Qiongfang, AN Dejun, DAI Qunwei, ZHANG Qiang, RAO Hanyun, REN Yazhen, LIU Fengqi, LIU Mingxue. Composition and diversity of microbial communities in high-altitude karst soil[J]. CARSOLOGICA SINICA, 2024, 43(2): 364-378. doi: 10.11932/karst2024y015

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Composition and diversity of microbial communities in high-altitude karst soil

doi: 10.11932/karst2024y015

1.
School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
2.
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
3.
School of Environment and Resources, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
4.
Huanglong National Scenic Area Administration, Songpan, Sichuan 624000, China
5.
Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
6.
Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MNR & GZAR/International Research Center on Karst under the Auspices of UNESCO, Guilin, Guangxi 541004, China

Received Date: 2023-09-27
Available Online: 2024-07-10

Abstract

Abstract

As a World Natural Heritage Site, Huanglong Scenic Area, is located in the eastern part of the Qinghai–Tibet Plateau in Songpan county, Aba Tibetan and Qiang Autonomous Prefecture, Sichuan Province. Huanglong valley is 3.50 km long, with an altitude of 3,145–3,578 m. In the Huanglong Scenic Area, there is a six-month freezing period, with a minimum temperature of 3 ℃. The main vegetation types are coniferous and broad-leaved mixed forests and coniferous forests, belonging to a typical plateau temperate to subfrigid monsoon climate. This scenic area is renowned at home and abroad for its rare and colorful karst landscape. At present, there is still a research gap in the structure and function of soil microorganisms of high-altitude karst habitats. Therefore, in order to explore the characteristics of soil microbial communities in Huanglong Scenic Area—a high-altitude karst area, we compared the differences in soil microbial community structure and diversity between high-altitude karst and non-high-altitude karst areas, with typical primary karst in Guilin—a non-high-altitude karst area. By analyzing the structural characteristics of soil microbial communities and their correlation with environmental impact factors, we laid a theoretical foundation for the relationship between soil microbial communities and ecological environment in high-altitude karst areas. In this study, we collected and analyzed soil samples from Huanglong valley, the main scenic area of the Huanglong Scenic Area. A total of 27 (three replicates) samples were collected and compared with the samples from the typical primary karst area in Guilin. We collected data on environmental factor, such as Total Organic Carbon (TOC), Soil Organic Matter (SOM), Total Nitrogen (TN), Total Product (TP), Temperature (T), Soil Water Content (SWC), and pH. Meanwhile, we employed high-throughput sequencing techniques such as ¹⁶SrRNA and ITS gene sequencing to perform bioinformatics analysis on sequencing data, including species diversity and β diversity. Then, we identified the main driving factors affecting soil in the Huanglong Scenic Area through principal component analysis (PCA), and explored the relationship between environmental factors and soil microbial communities by Spearman correlation analysis and redundancy analysis (RDA).The results show that the soil pH at each sampling point in Huanglong valley indicates a neutral to alkaline property, with no significant difference. But there are significant temperature differences at various sampling points. Compared to the soil from slopes of the Yaji test site in the non-high-altitude karst area of Guilin, the SOC, SOM, and TN contents in soil at various points in the Huanglong Scenic Area are relatively higher. There are differences in the bacterial chao1 index and observed OTUs index between Guilin's primary karst area and Huanglong valley. Similarly, the ACE index of bacteria and fungi also shows differences. These results may be attributed to the influence of vegetation types, soil types, and topographical factors on the distribution of soil microorganisms. The diversity indices of Shannon and Chao1 at HJ.4 sampling point in Huanglong valley are higher than those of other sampling points, indicating the richest biodiversity in this sampling point. At a phylum level, the bacterial community is mainly composed of Proteobacteria and Acidobacteria. Ascomycota and Basidiomycota are the dominant microbial groups in the high-altitude karst habitat of the Huanglong area. At a subordinate level, the main dominant bacteria in Huanglong valley are Pseudomonas, RB41, and Candidatus_Udaeobacter, with an average abundance of 14.57%, 3.11%, and 2.29%, respectively. The most dominant group in the primary karst area of Guilin is Candidatus_Udaeobacter, with an abundance of 6%. At a genus level, the dominant fungi in Huanglong valley are Humicola (22%) and Mortierella (22%). The dominant groups of the primary karst area in Guilin are Staphylococcum (5%), Absidia (5%), and Fusarium (4%). The differences in fungi at the phylum and genus levels are greater than those in bacteria. In summary, the proportion of dominant microorganisms in the primary karst area is relatively low, and the community types differ significantly compared to those in Huanglong valley. Samples collected from nine sampling points (three replicates) in Huanglong valley and in the primary karst area of Guilin show varying degrees of dispersion. UPGMA clustering analysis shows a high degree of similarity in various eukaryotic communities in Huanglong valley, while there are certain differences in the composition of prokaryotes among them. Redundancy analysis indicates that in bacteria, TP is the most correlated factor with community distribution, while T is the second most important environmental factor. In fungi, TP is also the most correlated factor, while T and pH are the second most important environmental factors. Both soil TP and T have a significant impact on the distribution of fungal and bacterial communities.
- high-altitude karst,
- Huanglong Scenic Area,
- karst soil,
- high-throughput sequencing,
- microbial community structure,
- environmental factor

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Composition and diversity of microbial communities in high-altitude karst soil

doi: 10.11932/karst2024y015

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通讯作者: 陈斌, bchen63@163.com

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Composition and diversity of microbial communities in high-altitude karst soil

doi: 10.11932/karst2024y015

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通讯作者: 陈斌, bchen63@163.com

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