Comparison of Bacterial Community Structure in Soil Aggregates Between Natural Karst Wetland and Paddy Field

被引：0

作者：

Leng M. ^{[1
]}

Jin Z.-J. ^{[1
,2
,3
]}

Xiao X.-Y. ^{[1
]}

Xiong L.-Y. ^{[1
]}

Li X.-S. ^{[1
]}

机构：

[1] College of Environmental Science and Engineering, Guilin University of Technology, Guilin

[2] Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin

[3] Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin

来源：

Huanjing Kexue/Environmental Science | 2022年 / 43卷 / 08期

关键词：

bacterial community; ecological network; karst wetland; paddy field; soil aggregates;

D O I：

10.13227/j.hjkx.202108277

中图分类号：

学科分类号：

摘要：

Studying the impact of land-use changes in wetland systems on the community structure of bacteria in soil aggregates can provide a theoretical basis for elucidating the impact mechanisms of the stability of wetland soil aggregates. The soil samples (0-20 cm) were collected from a natural wetland and paddy field in the Huixian karst wetland. The bacterial community structure in soil aggregates (macroaggregates 0. 25-2 mm, microaggregates 0. 053-0. 25 mm, and silt-clay <0. 053 mm) were analyzed using high-throughput sequencing and ecological network analysis. The results showed that ① the proportion of microaggregates in the paddy field was 29. 64%, which was significantly higher than that in the natural wetland (22. 20%), and ② there were differences in the relative abundance of bacteria between the natural wetland and paddy field. The relative abundance of Chloroflexi in macroaggregates, microaggregates, and silt-clay in the paddy field were 7. 97%, 8. 56%, and 7. 40%, respectively, which were significantly higher than those in the natural wetland (4. 93%, 4. 81%, and 3. 76%). The relative abundance of Anaerolineales in macroaggregates, microaggregates, and silt-clay in the paddy field were 2. 35%, 3. 03%, and 2. 65%, respectively, which were significantly higher than those in the natural wetland (0. 92%, 0. 91%, and 0. 43%). ③ Ecological network analysis showed that the number of nodes, edges, and the average numbers of neighbors in microaggregates and the silt-clay network in the paddy field were higher than those in the natural wetland, the average connectivity of the network was greater in the two components, and the characteristic path length was shorter. There was a longer characteristic path length, higher modularity, and lower average connectivity in the macroaggregate network of the paddy field. The above results indicated that the bacterial community structure in soil aggregates was altered after a natural wetland was used as a paddy field. The material circulation and information transmission efficiency of bacterial communities was higher in both microaggregates and silt-clay of the paddy field, whereas the bacterial community structure with low network tightness and high modularity in macroaggregates was more stable. © 2022 Science Press. All rights reserved.

引用

页码：4353 / 4363

页数：10

共 53 条

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