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Diversity of mycorrhizal fungi and soil indicative species in coastal plantations of northeast Brazil

Journal of Forestry Research 2021年第3期32卷 1203-1211页

作者： Olmar Baller Weber Maria Cátia Barroso da Silva Cristiane Figueira da Silva Diva Correia deborah dos santos garruti Marcela Claudia Pagano Embrapa Agroindústria Tropical Rua Dra.Sara Mesquita2270PiciFortalezaCeará60511-110Brazil Centro de Ciências E Tecnologia Universidade Estadual Do CearáAv.Dr.Silas Munguba1700Campus do ItaperiFortaleza 60740-000Brazil Universidade Federal Rural Do Rio de Janeiro BR 465 Km 7 Seropédica RJSeropédicaRio de Janeiro CEP 23890-000Brazil Universidade Federal de Minas Gerais Av.Antonio Carlos6627PampulhaBelo Horizonte 31270-001Brazil

The aim of this work was to evaluate arbuscular mycorrhizal(AM)fungi as soil indicators and the mycorrhization of native and exotic tree species planted in the Acaraúbasin,a transition area from the coast to the Brazilian semiarid region.Plots with 6-year-old trees of four native and three non-native species as well as one non-forested area were evaluated in terms of the diversity of AM fungi in the mycorrhizosphere and the root colonization by AM and ectomycorrhizal(EcM)fungi.Twenty-four AM fungi were identified;Claroideoglomus etunicatum,Glomus sinuosum,Paraglomus albidum,Acaulospora laevis,and Acaulospora brasiliensis were abundant in the forest soil.Diversity,dominance,evenness and richness indices of AM fungi were higher in plots with native trees.All root samples were colonized by AM fungi and only A nadenanthera colubrina,Acacia mangium,Casuarina equisetifolia and Eucalyptus urophylla formed associations with EcM fungi.Acaulospora morphotypes served as soil indicators for coverings with the native species Astronium fraxinifolium and Colubrina glandulosa.Exotic species may favor the proliferation of rarer AM fungi.These fungi–plant relationships may be important in the management of forest systems,and the evidence with mycorrhizal associations allows the inclusion of Brazilian species in tropical reforestation.

关键词： Acacia mangium Arbuscular mycorrhizal fungi Brazilian species Casuarina equisetifolia Ectomycorrhizal fungi Eucalyptus urophylla

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Biological and chemical attributes of soils under forest species in Northeast Brazil

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Journal of Forestry Research 2020年第5期31卷 1959-1973页

作者： Olmar Baller Weber Maria Catia Barroso da Silva Cristiane Figueira da Silva Joao Alencar de Sousa Carlos Alberto Kenji Taniguch deborah dos santos garruti Ricardo Espindola Romero Embrapa Tropical Agroindustry Rua Dra.Sara Mesquita2270PiciFortalezaCeara60511-110Brazil Centro de Ciencias e Tecnologia Universidade Estadual do CearaAv.Dr.Silas Munguba1700Campus do ItaperiFortaleza 60740-000Brazil Universidade Federal Rural do Rio de Janeiro BR 465Km 7SeropedicaRio De Janeiro 23890-000Brazil Depto Ciencia do Solo Universidade Federal do CearaCampus do PiciFortaleza 60021-970Brazil

Timber forests contribute to the sustainable development of the biomes in tropical regions.The aim of this study was to evaluate the biological and chemical properties of the soil as a consequence of the cover with native and non-native species in the Acarau basin,a transition area from the coast to the Brazilian semi-arid region.Areas planted with four native species(Anadenanthera colubrina,Astronium fraxinifolium,Handroanthus impetiginosus,Colubrina glandulosa)and three exotic species(Acacia mangium,Casuarina equisetifolia,Eucalyptus urophylla)plus a non-forested agricultural area were evaluated for organic carbon contents,and microbial and chemical soil properties.The levels of soil organic carbon were highest in A.colubrina and C.equisetifolia plantations.Low basal soil respiration was observed but the microbial biomass was particularly low in the non-forested area.In the C.equisetifolia,E.urophylla,and H.impetiginosus plantations,elevated soil metabolic quotients were found.The A.colubrina and H.impetiginosus plantations had the highest levels of easily extracted-glomalin related soil protein.Tree species affect concentrations of essential nutrients and the biological quality of the soil in different ways.They can also improve the biological and chemical properties of the soil in the coastal plains of tropical regions.

关键词： Soil quality Brazilian timber species Eucalyptus Acacia Casuarina

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Effect of Nb_(2)O_(5)·nH_(2)O Termal Treatment on the Esterification of a Fatty Acid

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Modern Research in Catalysis 2013年第3期2卷 63-67页

作者： deborah A.dos santos Valdemar Lacerda Jr. Julia Tristao do C.Rocha Reginaldo B.dos santos Sandro J.Greco Alvaro C.Neto Renzo C.Silva Eustaquio V.R.de Castro Chemistry Department Espirito Santo Federal UniversityVitoriaBrazil

In general, esterification reactions are favored by the increase in reaction temperature, excess of one of the reactants (usually alcohol), and additions of acid or basis catalysts. Esterification of oleic acid with methanol catalyzed by Nb2O5·nH2O calcined at different temperatures showed good conversion rates, especially at reaction temperature of 100°C and higher catalyst proportions. PLS calibration showed good results for predicting the amounts of methyl oleate in reaction products.

关键词： Nb_(2)O_(5)·nH_(2)O Calcination Fatty Acid PLS Calibration

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