Recurring heavy rainfall resulting in degraded-upgraded phases in soil microbial networks that are reflected insoil functioning  

作　　者：George P.Stamou Nikolaos Monokrousos Anastasia Papapostolou Effimia M.Papatheodorou 

机构地区：[1]Department of Ecology,School of Biology,Aristotle University,Thessaloniki 54124,Greece [2]University Center of International Programmes of Studies,International Hellenic University,Thessaloniki 57001,Greece

出　　处：《Soil Ecology Letters》2023年第3期75-88,共14页土壤生态学快报（英文）

摘　　要：Biological soil crusts(BSCs)are an important multi-trophic component of arid ecosystems in the Mediterranean region.In a mesocosm experiment,the authors investigated how the network of interactions among the members of the soil microbial communities in four types of soil sample responded when soils were exposed to two simulated extreme rain events.The four types of soil samples were:covered by Cladonia rangiformis and previously hydrated(+BSC+H),covered by C.rangiformis and dried(+BSC-H),uncovered and hydrated(-BSC+H),uncovered and dried(-BSC-H).Network analysis was based on the co-occurrence patterns of microbes;microbes were assessed by the phospholipid fatty acids analysis.The authors further explored the relations between networks’metrics and soil functions denoted by enzymatic activity and soil chemical variables.All networks exhibited Small world properties,moderate values of clustering coefficient and eigen centrality,indicating the lack of hub nodes.The networks in-BSC-H soils appeared coherent during the pre-rain phases and they became modular after rains,while those in+BSC-H soils kept their connectivity till the second rain but this then collapsed.The network metrics that were indicative of cohesive networks tended to be related to enzyme activity while those that characterized the loose networks were related to Ca,K,Mg,NH_(4)^(+) and organic N.In all mesocosms except for+BSC-H,networks’fragmentation after the second heavy rain was milder than after the first one,supporting the idea of community acclimatization.The response of microbial networks to heavy rains was characterized by the tendency to exhibit degradation-reconstruction phases.The network collapse in the crusted only mesocosms showed that the communities beneath crusts in arid areas were extremely vulnerable to recurring heavy rain events.

关 键 词：PLFAS Cladonia rangiformis biocrust soil microbial community network metrics 

分 类 号：S15[农业科学—土壤学]