| 岩溶湿地与稻田土壤团聚体细菌群落结构的比较 |
| 摘要点击 4786 全文点击 603 投稿时间：2021-08-25 修订日期：2021-11-18 |
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| 中文关键词 岩溶湿地 稻田 土壤团聚体 细菌群落 生态网络 |
| 英文关键词 karst wetland paddy field soil aggregates bacterial community ecological network |
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| 中文摘要 |
| 研究湿地系统中的土地利用变化对土壤团聚体中细菌群落结构的影响，可以为阐明土地利用变化对湿地土壤团聚体稳定性的影响机制提供理论依据.以会仙岩溶湿地和稻田为研究对象，利用高通量测序技术和生态网络分析对土壤团聚体（大团聚体0.25~2 mm、微团聚体0.053~0.25 mm和粉、黏粒<0.053 mm）细菌群落结构进行研究.结果表明：①微团聚体在稻田中占29.64%，显著高于其在天然湿地中的占比（22.20%）.②门水平上，绿弯菌门在稻田土壤大团聚体、微团聚体和粉、黏粒中的相对丰度分别为7.97%、8.56%和7.40%，显著高于其在天然湿地这3种粒径团聚体中的相对丰度（4.93%、4.81%和3.76%）；目水平上，厌氧绳菌目在稻田这3种粒径团聚体中的相对丰度分别为2.35%、3.03%和2.65%，显著高于其在天然湿地这3种粒径团聚体中的相对丰度（0.92%、0.91%和0.43%）.③生态网络分析显示，稻田微团聚体和粉、黏粒网络的节点数、边数和平均邻居数均高于天然湿地，并且在这两种组分中网络的平均连通度更大，特征路径长度更短；稻田大团聚体网络具有更长的特征路径长度、更高的模块性.结果表明，天然湿地改变为稻田后，土壤团聚体细菌群落结构改变，稻田微团聚体和粉、黏粒中细菌群落具有更高的物质循环和信息传递的效率，而稻田大团聚体细菌网络紧密性低，模块性高，其细菌群落结构更稳定. |
| 英文摘要 |
| 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. |
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