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用腐植酸的结构-性质-功能关系来解释植物生物活性

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腐植酸 2018年第6期 61-61页

作者： Andrés Calderín García Luiz Gilberto Ambrosio de Souza marcos gervasio pereira 周丽平中国农业科学院农业资源与农业区划研究所

尽管明确腐殖质(HSs)的结构一性质.功能之间的关系的相关研究已经取得了进展,但仍未有定论。我们分析了37个HSs组分的同位素组成、结构特征和刺激植物根系生长的特性。结果发现:虽然碳的来源不同(C3或C4),但土壤中提取的HSs和腐植酸(HAs... 详细信息

尽管明确腐殖质(HSs)的结构一性质.功能之间的关系的相关研究已经取得了进展,但仍未有定论。我们分析了37个HSs组分的同位素组成、结构特征和刺激植物根系生长的特性。结果发现:虽然碳的来源不同(C3或C4),但土壤中提取的HSs和腐植酸(HAs)在结构上是相似的。

关键词：腐植酸结构生物活性植物性质同位素组成根系生长 HSs

Behavior of wood basic density according to environmental variables

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Journal of Forestry Research 2022年第2期33卷 497-505页

作者： Gabriel marcos Vieira Oliveira JoséMárcio de Mello Carlos Rogério de Mello JoséRoberto Soares Scolforo Eder pereira Miguel Thiago Campos Monteiro Brazil Institute of Agricultural and Forestry Defense of Espírito Santo(IDAF) Av.Lourival Lugon Moulinnº300CentroJerônimo MonteiroES CEP:29.550-000Brazil Department of Forestry Sciences Universidade Federal de Lavras-UFLACaixa Postal 3037LavrasMG CEP:37.200-000Brazil Engineering Department Universidade Federal de Lavras-UFLACaixa Postal 3037LavrasMG CEP:37.200-000Brazil Forestry Engineering Department Faculdade de TecnologiaUniversity of Brasilia-UnBCampus Universitário Darcy RibeiroCaixa Postal 4357Asa Norte-BrasíliaDF CEP:70910-900Brazil Department of Forestry Engineering and Technology Universidade Federal do Paraná-UFPRAv.Pref.Lothário Meissner632Jardim BotânicoCuritibaPR CEP:80.210-170Brazil

The relationships between climate conditions and wood density in tropical forests are still poorly *** quantify spatial dependence of wood density in the state of Minas Gerais(MG,Brazil),map spatial distribution of density,and correlate density with climate variables,we extracted data from the Forest Inventory of Minas Gerais for 1988 trees scaled throughout the territory and measured wood density of discs removed from the *** variables were extracted from the database of the Ecological-Economic Zoning of Minas *** spatial analysis,tree densities were measured at 44 georeferenced sampling *** data were subjected to exploratory analysis,variography,cross-validation,model selection,and ordinary *** relationships between wood density and environmental variables were calculated using dispersion matrices,linear correlation,and *** density proved to be highly spatially dependent,reaching a correlation of 96%,and was highly continuous over a distance of 228 *** distribution of wood density followed a continuous gradient of 514-659 kg m^(−3),enabling corre-lation with environment *** was correlated with mean annual precipitation(−0.57),temperature(0.63),and evapotranspiration(0.83).Geostatistical methods proved useful in predicting wood density in native tropical forests with different climate *** results confirmed the sensitivity of wood density to climate change,which could affect future carbon stock in forests.

关键词： Biomass Climate variables Geostatistics Hardwood Forest inventory Minas Gerais

Effect of pre-and post-wildfire management practices on plant recovery after a wildfire in Northeast Iberian Peninsula

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Journal of Forestry Research 2020年第5期31卷 1647-1661页

作者： marcos Francos Paulo pereira Xavier Ubeda GRAM(Grup de Recerca Ambiental Mediterrania) Department of GeographyUniversity of BarcelonaMontalegre608001 BarcelonaSpain Environmental Management Centre Mykolas Romeris UniversityVilniusLithuania

Fire and pre-or post-fire management practices shape the distribution and richness of plant ***,the effects of pre-and post-fire management on vegetation recovery were studied at different times,up to 18 months after a *** months after a 2015 wildfire,18 study plots were established(three 4-m^2 plots for each treatment),vegetation regrowth was monitored and vegetal species richness(S),evenness(IT),density(D),diversity(H0)and maximum diversity(HMax)after 2,10 and 18 *** treatments were(1)control,unaffected by 2015 wildfire;(2)no treatment(NT),burned in 2015 wildfire and not managed;(3)managed in 2005 and burned in 2015(M05B);(4)managed in 2015,2 months before wildfire(M15B);(5)cut and manual removal after the 2015 wildfire(CR);(6)cut and no trunk removal randomly deposited on topsoil after the 2015 wildfire(CL).All the treatments were carried out in a Pinus halepensis Miller *** 10 and 18 months after the wildfire,vegetation recovery was greater in NT,CR and CL plots than in M05B and M15B the *** 18 months after the wildfire,Brachypodium retusum(Pers.)*** Rosmarinus officinalis *** still dominant,especially in M15B,corroborating the belief that pre-fire treatment reduced ecosystem resilience and vegetal recovery compared to the NT and post-fire managed *** was significantly lower 10 months after wildfire in control plots,and IT was significantly higher in that inventory than previously in *** months after the wildfire,H0 was significantly lower in *** months post-wildfire,HMax was significantly lower in the control *** months after the wildfire,HMax,was significantly higher in CR,CL and M05B than in the control and M15B ***,pre-fire management was detrimental to post-fire vegetation recovery,while manual post-fire management proved beneficial.

关键词： Forest management Vegetation recovery Diversity Richness Evenness

Long-term forest management after wildfire(Catalonia,NE Iberian Peninsula)

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Journal of Forestry Research 2020年第1期31卷 269-278页

作者： marcos Francos Xavier Ubeda Paulo pereira GRAM(Grup de Recerca Ambiental Mediterrania) Department of GeographyUniversity of BarcelonaMontalegre608001 BarcelonaSpain Environmental Management Centre Mykolas Romeris UniversityVilniusLithuania

Studies of post-fire soil status in Mediterranean ecosystems are common;however,few have examined the effects of long-term forest management after a wildfire on physicochemical soil ***,we analyzed differences in soil properties attributable to long-term postfire management and assessed the sustainability of these management practices in relation to the soil *** study area is located in Odena in the northeast region of the Iberian Peninsula consisted of the control forest(burned more than 30 years ago),low density forest(LD;burned in a wildfire in 1986 and managed in 2005)and high density forest(HD;burned in a wildfire in 1986 and no managed).For soils from each plot,we measured soil water repellency,aggregate stability,total nitrogen(TN),soil organic matter(SOM),inorganic carbon(IC),pH,electrical conductivity,extractable calcium,magnesium,sodium,potassium(K),phosphorus,aluminum(Al),manganese(Mn),iron(Fe),zinc,copper,boron,chrome,silicon and sulfur and calculated the ratios of C/N,Ca+Mg/(Na+K)^1/2,Ca/Al and Ca/*** differences were found in TN,IC,SOM,pH,K,Al,Mn,Fe and C/N ratio(p<0.05).All soil properties were found to have largely recovered their pre-fire *** were affected by the post-fire management practices implemented 20 years after the fire,as reflected in their respective physicochemical properties,so that soil properties at the control and LD sites are more similar today than those at the control and HD ***,sustainable forest management can overcome soil degradation in areas affected by wildfire in the medium-and long-term by improving soil properties.

关键词： Soil chemical properties Aggregate stability Post-fire management Wildfire risk Vegetal density

Multiomic investigation of Sugarcane mosaic virus resistance in sugarcane

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The Crop Journal 2023年第6期11卷 1805-1815页

作者： Ricardo JoséGonzaga Pimenta Alexandre Hild Aono Roberto Carlos Villavicencio Burbano Marcel Fernando da Silva Ivan Antônio dos Anjos marcos Guimarães de Andrade Landell marcos Cesar Gonçalves Luciana Rossini Pinto Anete pereira de Souza Centre for Molecular Biology and Genetic Engineering University of CampinasCampinasBrazil Gustavo Galindo Velasco Campus Littoral Polytechnic Superior SchoolGuayaquilEcuador Advanced Centre for Technological Research in Sugarcane Agribusiness Agronomic Institute of CampinasRibeirão PretoBrazil Plant Protection Research Centre Biological InstituteSão PauloBrazil Department of Plant Biology Institute of BiologyUniversity of CampinasCampinasBrazil

Sugarcane mosaic virus(SCMV)is the main etiological agent of sugarcane mosaic disease,which affects sugarcane and other grass *** the extensive characterization of quantitative trait loci controlling resistance to SCMV in maize,the genetic basis of this trait in sugarcane is largely ***,a genome-wide association study was performed and machine learning coupled with feature selection was used for genomic prediction of resistance to SCMV in a diverse sugarcane *** single-nucleotide polymorphisms(SNPs)explained up to 29.9%of the observed phenotypic variance and a 73-SNP set predicted resistance with high accuracy,precision,recall,and F1 scores(the harmonic mean of precision and recall).Both marker sets were validated in additional sugarcane genotypes,in which the SNPs explained up to 23.6%of the phenotypic variation and predicted resistance with a maximum accuracy of 69.1%.Synteny analyses suggested that the gene responsible for the majority of SCMV resistance in maize is absent in sugarcane,explaining why this major resistance source has not been identified in this ***,using sugarcane RNA-Seq data,markers associated with resistance to SCMV were annotated,and a gene coexpression network was constructed to identify the predicted biological processes involved in *** network allowed the identification of candidate resistance genes and confirmed the involvement of stress responses,photosynthesis,and the regulation of transcription and translation in resistance to *** results provide a practical marker-assisted breeding approach for sugarcane and identify target genes for future studies of SCMV resistance.

关键词： Saccharum SCMV GWAS Machine learning RNA-Seq

cAMP:A second messenger involved in the mechanism of midgut alkalinization in Lutzomyia longipalpis

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Insect Science 2022年第4期29卷 1059-1070页

作者： Denise Barguil Nepomuceno Grasielle Caldas D’Ávila Pessoa Leonardo Barbosa Koerich marcos Horácio pereira Mauricio Roberto Viana Sant'Anna Ricardo Nascimento Araújo Nelder Figueiredo Gontijo Laboratório de Fisiologia de Insetos Hematófagos Departamento de Parasitologia/ICBUniversidade Federal de Minas GeraisBelo HorizonteMGBrazil

The sand fly Lutzomyia longipalpis is the main vector of Leishmania infantum in the *** sand flies ingest sugar-rich solutions and blood,which are digested in the *** of nutrients is an essential function performed by digestive enzymes,which require appropriate physiological *** of the main aspects that influence enzymatic activity is the gut pH,which must be tightly *** second messengers are frequently involved in the coordination of tightly regulated physiological events,we investigated if the second messenger cAMP would participate in the process of alkalinization in the abdominal midgut of female *** midguts containing the indicator dye bromothymol-blue,cAMP stimulated the alkalinization of the midgut *** another technique based on the use of fluorescein as a pH indicator,we propose that cAMP is involved in the alkalinization of the midgut by activating HCO3-transport from the enterocyte's cytoplasm to the *** results strongly suggested that the carrier responsible for this process would be a HCO3−/Cl−antiporter located in the enterocytes’apical *** promotes the release of alkalinizing hormones in the hemolymph;however,when the enzyme adenylyl cyclase,responsible for cAMP production,was inhibited,we observed that the hemolymph from blood-fed ***’females did not stimulate midgut *** result indicated that hormone-stimulated alkalinization is mediated by *** the present study,we provide evidences that cAMP has a key role in the control of intestinal pH.

关键词： abdominal midgut alkalinization cAMP HCO_(3)^(-)/Cl^(-)antiport hormone Lulcomyia longipalpis

Lithic soils in the semi-arid region of Brazil:edaphic characterization and susceptibility to erosion

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Journal of Arid Land 2022年第1期14卷 56-69页

作者： Carlos R PINHEIRO JUNIOR Conan A SALVADOR Tiago R TAVARES Marcel C ABREU Hugo S FAGUNDES Wilk S ALMEIDA Eduardo C SILVA NETO Lúcia H C ANJOS marcos G pereira Federal Rural University of Rio de Janeiro(UFRRJ) Department of SoilsSeropédicaRio de Janeiro 23890Brazil Center for Nuclear Energy in Agriculture(CENA) University of São Paulo(USP)PiracicabaSão Paulo 13416Brazil Federal Institute of Education Science and Technology of Rondônia(IFRO)Rural ZoneAriquemesRondônia 78930Brazil

Soils(Leptosols or Epileptic Regosols)with lithic contact at a depth of 50 cm occupy almost 20%of the Brazilian semi-arid *** lithic soils are susceptible to erosion due to faster saturation of water-holding capacity during rainfall,which accelerates the beginning of ***,erosion traits of lithic soils in the semi-arid region of Brazil are less *** aim of this study was to characterize the soil and landscape attributes in areas with Neossolos Litólicos(Entisols)in the Caatinga biome to identify region of high susceptibility to *** showed that the soils were characterized by a sandy texture,soil structure with poor development and low content of organic *** attributes increase susceptibility to erosion and reduce water storage capacity,especially in the states of Cearáand *** these states,the content of rock fragments in the soil reaches 790 g/*** contents of silt and fine sand,high silt/clay ratio,predominance of Leptosols and strong rainfall erosivity were observed in Piauíand northwestern Ceará.A very high degree of water erosion was observed in the states of Pernambuco and Paraí*** the low degree of erosion observed in the state of Bahia,it is highly susceptible to erosion due to the predominance of very shallow soils,rugged relief and high values of rainfall *** vulnerability was observed in the state of Alagoas because of its more smoothed relief,greater effective soil depth,thicker A horizon of soil and lower rainfall *** general,the characteristics that intensify the susceptibility to erosion in the Caatinga biome are those soil structures with poor development or without aggregation,low contents of organic carbon,high contents of silt and fine sand,high values of silt/clay ratio and rugged relief in some *** study collected information contributing to a better characterization of soils with lithic contact in the semi-arid region of *** addition,regions with

关键词： Caatinga biome drylands erosive processes leptosols soil degradation

Hydrometeorological Modeling of Limpopo River Basin in Mozambique with TOPMODEL and Remote Sensing

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Open Journal of Modern Hydrology 2022年第2期12卷 55-73页

作者： Tomásio Eduardo Januário Augusto José pereira Filho marcos Figueiredo Salviano Department of Atmospheric Sciences Institute of Astronomy Geophysics and Atmospheric Sciences University of S&#227 o Paulo S&#227 o Paulo Brazil Geological Survey of Brazil S&#227 o Paulo Brazil

The Limpopo River basin (LRB) is known for its vulnerability to floods, high rates of evapotranspiration, and droughts that cause significant losses to the local community. The present study aimed to perform simulations of flood events occurring in two Mozambican sub-basins of LRB, namely Chókwè and Xai-Xai from 2000 to 2015 with TOPography-based hydrological MODEL (TOPMODEL) and satellite remote sensing data. As input in TOPMODEL, data from two high-resolution global satellite-based precipitation products: Climate Prediction Center MORPHing technique (CMORPH) and Integrated Multi-Satellite Retrievals for the Global Precipitation Mission (GPM) algorithm (IMERG), 8-day MOD16 evapotranspiration product and surface runoff data estimated by Global Land Data Assimilation System (GLDAS) were used. The sensitivity tests of TOPMODEL parameters were applied using the Monte Carlo simulation. Calibration and validation of the model were performed by the Shuffled Complex Evolution (SCE-UA) method and were evaluated with the Kling-Gupta Efficiency (KGE) index. The results indicated that simulations with the GPM-IMERG (KGE: 0.59 and 0.65) tended to underestimate the stream flows, while with the CMORPH product the performance was much better (KGE: 0.66 and 0.77) in both sub-basins. Thus, TOPMODEL can help to develop flood monitoring systems from satellite remotely sensed data in similar regions of Mozambique.

关键词： Floods Simulations Limpopo River TOPMODEL CMORPH IMERG

CeO_(2)-Nb_(2)O_(5)photocatalysts for degradation of organic pollutants in water

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Rare Metals 2020年第3期39卷 230-240页

作者： Nathália pereira Ferraz Andre Esteves Nogueira Francielle Candian Firmino marcos Vanessa Aguiar Machado Rene Rojas Rocca Elisabete Moreira Assaf Yvan Jesus Olortiga Asencios Institute of Marine Science Federal University of Sao PauloSantosSP11030-100Brazil Brazilian Center for Research in Energy and Materials(CNPEM) CampinasSP13083-970Brazil Sao Carlos Institute of Chemistry University of Sao PauloSao CarlosSP13566-590Brazil

The photocatalytic properties of CeO2-Nb2O5 photocatalysts in heterogeneous photocatalysis(under ultraviolet and visible radiation)and in Fenton-like process were *** blue dye(MB)and phenol(Ph)were used as models of pollutant molecules for these reactions,and the photocatalysts were characterized by X-ray diffraction(XRD),diffuse reflectance spectroscopy(DRS),scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDX)and thermally stimulated luminescence(TL).The results indicated that the addition of CeO2(0.3 wt%,1.0 wt%and 2.0 wt%)to Nb2O5 sensitized the resultant materials,increasing light absorption in the visible ***,there is a suitable formulation of CeO2-Nb2O5 photocatalysts to improve each photocatalytic *** heterogeneous photocatalysis,the addition of small CeO2 quantities to Nb2O5 was enough to improve the photocatalytic activity of CeO2-Nb2O5 photocatalysts(The best composition reported was CeO20.3 wt%.).The effectiveness of the catalyst was explained by the decrease in the number of trapping and luminescence centers in the conduction band of the material after the addition of CeO2 to Nb2O5,but a large amount of CeO2 decreased the number of trapping,luminescent and active centers to a large ***,in a Fenton-like process,the addition of CeO2 to Nb2O5 was favorable in all the proportions studied.(The best composition was 2.0 wt%CeO2.)In this case,the effectiveness was explained by the influence of the adsorption process(adsorption-triggered process),and the interactions between H2 O2 and Ce3+of the CeO2 in each photocatalyst thus formed surface peroxide species O22-,which induced the removal of the organic molecules under visible light.

关键词： Advanced oxidation process Photocatalysts Nb_(2)O_(5) CeO_(2) Phenol Methylene blue