辉河湿地河岸带土壤微生物群落组成与土壤理化关系

Relationship between Soil Microbial Community Composition and Soil Physicochemical Properties in Riparian Zone of Huihe Wetland

本研究依托于高通量测序的技术,通过研究辉河湿地河岸带上游、中上游、中游、中下游和下游河段不同淹水条件下土壤微生物群落组成,揭示辉河湿地河岸带不同淹水条件下土壤微生物群落变化及与土壤理化的关系。结果表明:拟杆菌门(Bacteroidota)和广古菌门(Halobacterota)丰度在3条淹水样带中的变化趋势为长期淹水区(W)>干湿交替区(WD)>未淹水区(D)(P<0.05),酸杆菌门(Acidobacteriota)和放线菌门(Actinobacteriota)丰度在3条淹水样带中的变化趋势为长期淹水区(W)<干湿交替区(WD)<未淹水区(D)(P<0.05),在属水平上,甲烷毛发菌属(Methanosaeta)、甲烷八叠球菌属(Methanosarcina)和unidentified-Bathyarchaeia丰度在3条样带中的变化趋势为长期淹水区(W)>干湿交替区(WD)>未淹水区(D)(P<0.05),RB41和Candidatus_Udaeobacter丰度在3条淹水样带中的变化趋势为长期淹水区(W)<干湿交替区(WD)<未淹水区(D)(P<0.05);微生物多样性与土壤容重和植物地上生物量呈显著负相关(P<0.05),土壤pH值、电导率、容重、土壤含水量、总磷和总有机碳是影响微生物群落组成的主要驱动因素。该研究为辉河湿地河岸带生态效果评估与修复提供了科学依据。

Based on high-throughput sequencing technology,this paper studied the soil microbial community composition in the upper,upper-middle,middle,middle-lower and lower reaches of the riparian zone of Huihe wetland under different flooding conditions,and revealed the changes of soil microbial communities and their relationship with soil physical and chemical properties under different flooding status.The results showed that:the abundance of Bacteroidota and Halobacterota in the three flooded zones displayed a trend of that in the Wetted State(W)>Wetting-drying State(WD)>Dried State(D)(P<0.05),The abundance of Acidobacteriota and Actinobacteriota in the three flooded zones showed a trend of that in the Wetted State(W)<Wetting-drying State(WD)<Dried State(D)(P<0.05).At the genus level,the abundance of Methanosaeta,Methanosarcina and unidentified-Bathyarchaeia in the three transits showed a trend of that in the Wetted State(W)>Wetting-drying State(WD)>Dried State(D)(P<0.05).The variation trends of RB41 and Candidatus_udaeobacter abundance in three flooded zones were as follows:Wetted State(W)<Wetting-drying State(WD)<Dried State(D)(P<0.05).Microbial diversity was negatively correlated with soil bulk density and aboveground biomass(P<0.05).The soil pH,electrical conductivity,bulk density,soil water content,total phosphorus and total organic carbon were the main driving factors affecting microbial community composition.This study provided a scientific basis for the ecological assessment on the restoration of the riparian zone of the Hui River Wetland.