首页|Role of nosZ Ⅰ-carrying microorganisms in regulating nitrous oxide reduction during forest conversion:A comparison of plantations and a secondary forest in subtropical soils
Role of nosZ Ⅰ-carrying microorganisms in regulating nitrous oxide reduction during forest conversion:A comparison of plantations and a secondary forest in subtropical soils
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Role of nosZ Ⅰ-carrying microorganisms in regulating nitrous oxide reduction during forest conversion:A comparison of plantations and a secondary forest in subtropical soils
The conversion of natural forests in subtropical regions to plantations or secondary forests has resulted in alterations in soil variables,microbial communities,and microbially mediated processes,including nitrous oxide(N2O)emissions.However,how forest conversion influences soil N2O reduction and the abundance and community structure of N2O-reducing microorganisms remains unclear.Here,we investigated the impact of converting natural forests to a secondary forest and Cunninghamia lanceolata and Pinus massoniana plantations on the abundance and community structure of N2O-reducing microorganisms in both bulk soils and soil aggregates.Compared with the secondary forest,plantations had higher soil pH and available phosphorus and moisture contents,lower soil NH4+content,but similar aggregate sizes.Compared with the secondary forest,the conversion of natural forest to plantations resulted in significantly higher soil N2O reduction rate and increased abundances of nosZ Ⅰ and nosZ Ⅱ genes in bulk soils and soil aggregates.The abundance of nosZ Ⅰ was higher than that of nosZ Ⅱ in all tested soils and had a stronger association with N2O reduction rate,suggesting the greater role of nosZ Ⅰ-carrying microorganisms in N2O consumption.Forest conversion had a greater impact on the community composition of nosZ Ⅰ than nosZ Ⅱ,mainly by increasing the relative abundances of alpha-and beta-Proteobacteria,while decreasing gamma-Proteobacteria.However,nosZ Ⅱ-carrying microorganisms were exclusively dominated by Gemmatimonadetes and less affected by forest conversion.Taken together,our findings significantly contribute to our understanding of the eco-physiological characteristics of N2O-reducing microorganisms and highlight the importance of nosZ Ⅰ-carrying microorganisms in N2O consumption in subtropical forest soils.
community compositioncommunity structureN2O-reducing microorganismssoil aggregatesubtropical forest
Fujian Provincial Key Laboratory for Subtropical Resources and Environment,Fujian Normal University,Fuzhou 350117(China)
Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity Fuzhou Institute of Oceanography,Minjiang University,Fuzhou 350108(China)
School of Agriculture and Food,Faculty of Science,The University of Melbourne,Parkville,Victoria 3010(Australia)
Sanming Forest Ecosystem and Global Change National Observation and Research Station,Sanming 365002(China)
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community composition community structure N2O-reducing microorganisms soil aggregate subtropical forest
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