Bridging soil biogeochemistry and microbial communities (archaea and bacteria) in tropical seagrass meadows

Frontiers in Marine Science

Marine Science

Pedro Avelino Maia de Andrade¹  Daniel Gorman²  Gabriel Nuto Nóbrega³  Arthur Prudêncio de Araújo Pereira³  Wen Zhuang⁴  Margareth da Silva Copertino⁵  Xosé Luis Otero⁶  Fernando Dini Andreote⁷  Tiago Osório Ferreira⁷  Hermano Melo Queiroz⁷  Jinming Song⁸ 

[1] Agricultural Production Program, Federal University of Agreste Pernambuco (UFAPE), Garanhuns, Pernambuco, Brazil;Commonwealth Scientific and Industrial Research Organization (CSIRO), Environment, Crawley, WA, Australia;Department of Soil Science, Federal University of Ceará (UFC), Fortaleza, Ceará, Brazil;Institute of Eco-environmental Forensics, Shandong University, Qingdao, Shandong, China;School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong, China;National Laboratory for Marine Science and Technology, Qingdao, Shandong, China;Institute of Oceanography, Federal University of Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil;Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong, China;Cretus, Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela (USC), Santiago de Compostela, Spain;Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo (USP), Department of Soil Science, Piracicaba, São Paulo, Brazil;National Laboratory for Marine Science and Technology, Qingdao, Shandong, China;Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, Shandong, China;

关键词: coastal wetlands;    Ruppia maritima;    Halodule wrightii;    Fe fractionation;    Metabolic pathways;   

DOI  :  10.3389/fmars.2023.1190497

 received in 2023-03-21, accepted in 2023-09-05,  发布年份 2023

来源: Frontiers

【 摘 要 】

IntroductionSeagrass meadows are among the most valuable ecosystems, providing numerous ecosystem services and functions. Despite its importance, there is a lack of knowledge about soil’s biogeochemical process variability, which can control microbiological communities. Thus, this study aimed to evaluate whether seagrass meadows in different geo-environments exhibit varying Fe and sulfate reduction intensities, shaping distinct archaea and bacteria communities.MethodsSoil samples were collected in seagrass meadows under contrasting climatic, geological, vegetational and hydrological settings along the Brazilian coast (e.g., Semiarid Coast - SC, Southeastern Granitic Coast – GC, and Southern Quaternary Coast - QC). The soils were characterized by particle size, pH, redox potential (Eh), total organic C and total N content, acid-volatile sulfides (AVS), and simultaneously extracted Fe. Furthermore, a solid-phase Fe fractionation was performed to characterize the decomposition pathways in these soils, and the shifts in the microbial community along this spatial variation were analyzed using denaturing gradient gel electrophoresis. ResultsThe studied soils presented a sandy texture (values ranging from 74 ± 11.8 to 80.5 ± 6.4%) caused by energetic hydrodynamic conditions. The pH values were circumneutral, while redox conditions presented significant distinction among the studied sites, ranging from anoxic to oxic (values ranging from -63 to +334 mV). The degree of pyritization (DOP) ranged from< 10% to values higher than 80%, highly influenced by rhizospheric oxidation, and higher AVS content was recorded for sites with lower DOP (i.e., GC and QC). DiscussionsThus, biogeochemical processes in the seagrass soils present a wide variation in response to the geo-environmental settings. Plants influence the soil’s geochemical and microbiological communities, retaining fine particles, promoting rhizosphere oxidation, and inducing anoxic conditions controlling the Fe and S forms. Moreover, the same plant species can result in distinct soil conditions and microbial communities due to geoenvironmental settings.

【 授权许可】

Unknown   
Copyright © 2023 Nóbrega, de Andrade, Queiroz, Pereira, Copertino, Gorman, Zhuang, Song, Andreote, Otero and Ferreira