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Hydrological variability and long-term floristic-structural modifications in different habitats of a tropical semi-deciduous forest

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Journal of Forestry Research 2022年第3期33卷 801-811页

作者： Alisson Borges Miranda Santos Vinicius Andrade Maia Cléber Rodrigo de Souza Natália de Aguiar-Campos Aurélio de Jesus Rodrigues Pais Wilder Bento da Silva Nathalle Cristine Alencar Fagundes Jean Daniel Morel Rubens Manoel dos Santos department of Forestry Sciences Federal University of LavrasCampus UniversitárioC.P.3037LavrasBrazil Faculty of Environmental Engineering and Natural Resources Zambeze UniversityChimoioC.P.2400Mozambique Biological Sciences Universidade do Estado de Minas GeraisUnidade ItuiutabaAv.Antônio Carlos 6627Ituiutaba31270-901Brazil department of Biology Federal University of LavrasUniversity campusC.P.3037Lavras37200-000Brazil

Shifts in hydrological regimes alter river flow rates and flood pulses, decrease environmental heterogeneity and the floristic-structural complexity of associated plant communities. We tested the hypothesis that drought events affect plant community composition and structure at a small-scale within a riparian fragment towards a reduction in floristic-structural complexity. The tree community was sampled in three habitats (wet, transitional and dry) and monitored in seven inventories carried out between 1991 and 2018. Hydrological variations were evaluated through annual rainfalls, river flow rates and water level data. The species richness and the detrended correspondence analysis axes were used to characterise the temporal modifications in floristic composition. Community structure was described in terms of biomass: accumulated, growth of survivors, mortality and recruitment. Generalised linear mixed models were fitted to evaluate the effects of time and environment in community. It was concluded that the climate has become drier in recent years due to declining precipitation that has affected flow rates and water levels. The floristic-structural complexity of the study fragment was maintained during the monitoring period. However, prolonged and extreme drought events displayed the potential to impact floristic-structural patterns.

关键词： Forest dynamics Climate changes Semi-deciduous seasonal forest Temporal change Functioning communities

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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 understood.To 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 trees.Environmental variables were extracted from the database of the Ecological-Economic Zoning of Minas gerais.For spatial analysis,tree densities were measured at 44 georeferenced sampling points.The data were subjected to exploratory analysis,variography,cross-validation,model selection,and ordinary kriging.The relationships between wood density and environmental variables were calculated using dispersion matrices,linear correlation,and regression.Wood density proved to be highly spatially dependent,reaching a correlation of 96%,and was highly continuous over a distance of 228 km.The distribution of wood density followed a continuous gradient of 514-659 kg m^(−3),enabling corre-lation with environment variables.density 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 conditions.Our 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

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Using dung beetles to evaluate the effects of urbanization on Atlantic Forest biodiversity

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Insect Science 2013年第3期20卷 393-406页

作者： Vanesca Korasaki Jose Lopes George Gardner Brown Julio Louzada departamento de Agronomia departamento de Biologia Animal e Vegetal Universidade Estadual de Londrina Londrina-PR Empresa Brasileira de Pesquisa Agropecu~ria Embrapa Florestas Colombo-PR departamento de Biologia Setor de Ecologia Universidade Federal de Lavras Lavras Minas Gerais Brazil

We used dung beetles to evaluate the impact of urbanization on insect biodi- versity in three Atlantic Forest fragments in Londrina, Parana, Brazil. This study provides the first empirical evidence of the impact of urbanization on richness, abundance, compo- sition and guild structure of dung beetle communities from the Brazilian Atlantic Forest. We evaluated the community aspects （abundance, richness, composition and food guilds） of dung beetles in fragments with different degrees of immersion in the urban matrix using pitfall traps with four alternative baits （rotten meat, rotten fish, pig dung and decaying ba- nana）. A total of 1 719 individuals were collected, belonging to 29 species from 11 genera and six Scarabaeinae tribes. The most urban-immersed fragment showed a higher species dominance and the beetle community captured on dung presented the greatest evenness. The beetle communities were distinct with respect to the fragments and feeding habits. Except for the dung beetle assemblage in the most urbanized forest fragment, all others exhibited contrasting differences in species composition attracted to each bait type. Our results clearly show that the degree of urbanization affects Atlantic Forest dung beetle communities and that the preservation of forest fragments inside the cities, even small ones, can provide refuges for Scarabaeinae.

关键词： bioindicator coprophagous beetles food preference fragmentation habitat loss urban matrix

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Assessment of Vulnerability of Oxisols to Compaction in the Cerrado Region of Brazil

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Pedosphere 2010年第2期20卷 252-260页

作者： A.E.AJAYI M.S.DIAS JUNIOR N.CURI A.OKUNOLA T.T.TEIXEIRA SOUZA B.SILVA PIRES department of Agricultural Engineering Federal University of Technology departamento de Ci encia do Solo Universidade Federal de Lavras federal College of Agriculture Fundacao de Ensino Superior de Passos Universidade do Estado do Minas Gerais

The Cerrado region of Brazil,one of the fastest-growing agricultural areas in the world,is undergoing very rapid mechanization;this development is good for the country's economy but may also snowball into substantial loss of agricultural land and other environmental degradation if the soil susceptibility and vulnerability to compaction is not well understood.In this study we explored different techniques for estimating soil intrinsic abilities to withstand applied pressure using the prevalent Oxisols of the Cerrado region under native vegetation.Undisturbed samples were collected from three sites within the region and subjected to 1) compressibility test;2) manual penetration resistance test;3) automated penetration resistance test;and 4) packing density analysis.The four methods produced analogous results.Our results showed the significant influence of soil structure on the inherent strength and compaction susceptibility of the soils.We also established the association of soil structure with the mineralogy of the soil.It is noteworthy that the packing density which was developed from very simple and easily obtained parameters could give a picture of the tendency of the soil to compact.Thus,this approach would be useful in developing compaction susceptibility maps for the region.It could be concluded that most of the Oxisols in the Cerrado region would support mechanized agricultural production very successfully.However,there is need for careful management of the mechanization process to avert degradation.The management techniques should include conservationist practices such as no till in order to maintain as much as possible the favorable structure and drainage of these very old soils.

关键词：脆弱性评估氧化土巴西压实

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Soil and climate equally contribute to changes in the species compositions of Brazilian dry forests across 300 km

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Journal of Plant Ecology 2020年第2期13卷 171-176页

作者： Daniel M.Arruda Luiz F.S.Magnago Ricardo R.C.Solar Reinaldo Duque-Brasil Priscyla M.S.Rodrigues Rubens M.Santos Carlos E.G.R.Schaefer Instituto de Geociências Universidade Federal de Minas GeraisBelo HorizonteMinas GeraisBrazil Centro de Formação em Ciências e Tecnologias Agroflorestais Universidade Federal do Sul da BahiaItabunaBahiaBrazil Instituto de Ciências Biológicas Universidade Federal de Minas GeraisBelo HorizonteMinas GeraisBrazil Instituto de Ciências da Vida Universidade Federal de Juiz de ForaGovernador ValadaresMinas GeraisBrazil Colegiado de Ecologia Universidade Federal do Vale do São FranciscoSenhor do BonfimBahiaBrazil departamento de Ciências Florestais Universidade Federal de LavrasLavrasMinas GeraisBrazil departamento de Solos Universidade Federal de ViçosaViçosaMinas GeraisBrazil

了解在不同空间尺度上控制生物多样性分布的因素是保护工作面临的一个关键挑战。生物多样性,反映在不同地点物种组成的差异(β多样性),可以通过物种更替(周转率)获得,并受到多种因素的驱动。在本研究中,我们试图通过研究两个与受威胁的... 详细信息

了解在不同空间尺度上控制生物多样性分布的因素是保护工作面临的一个关键挑战。生物多样性,反映在不同地点物种组成的差异(β多样性),可以通过物种更替(周转率)获得,并受到多种因素的驱动。在本研究中,我们试图通过研究两个与受威胁的巴西季节性干旱森林相关的问题探讨:(I)物种周转对β多样性的贡献是什么?(II)哪些因素驱动了林块间物种组成的变化?我们在17个相隔近300公里的干燥森林斑块中对树种进行采样,以及采集环境变量(土壤和气候)。我们使用β多样性划分框架来确定周转率的贡献,采用冗余分析和适合的空间结构来评估环境和空间因素对物种组成变化的贡献。斑块间的β多样性主要以周转组分(98.2%)为代表,Simpson相异度优于国内其他地区(多位点和两两比较的平均值分别为0.89和0.71)。环境因子对物种组成变化的解释多于空间因素,占物种组成变化的30.3%,其中28.1%是非空间结构的。我们建议,300公里代表一个阈值,在这个阈值上,土壤和气候预测因子在决定群落周转方面具有相似的效应(在不考虑空间结构的情况下,分别为14.9%和12.6%)。因此,应该跨景观考虑保护策略,以有效地保护热带森林多样性,因为即使考虑到不同规模的气候差异,景观化的土壤种类也是物种周转的重要驱动因素。

关键词： β多样性环境过滤生境破碎化景观结构植物地理学

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Litterfall dynamics and soil carbon and nitrogen stocks in the Brazilian palm swamp ecosystems

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Forest Ecosystems 2020年第3期7卷 499-510页

作者： Gracielle de Brito Sales Taynan Aquilles Marinho Lessa Daniela Aparecida Freitas Maria das Dores Magalhães Veloso Maria Ligia de Souza Silva Luiz Arnaldo Fernandes Leidivan Almeida Frazão Instituto de Ciências Agrárias Universidade Federal de Minas GeraisAvenida Universitária1000Montes ClarosMG39404-547Brazil universidade Estadual de Montes Claros Avenida Professor Rui Braga S/NMontes ClarosMG39401-089Brazil universidade federal de lavras Campus UniversitárioCP 3037LavrasMG37299-000Brazil

Background: This study aimed to determine the litterfall production, accumulation, decomposition rate and nutrient stocks, and to estimate the soil carbon(C) and nitrogen(N) stocks in three palm swamp ecosystems with different land use intensities in the Southeast of Brazil.Methods: Three palm swamp ecosystems with different land use intensities were evaluated: Agua Doce(AD),conserved area;Capivara(CV), area with small agricultural practices;and Buriti Grosso(BG), area with an intensive land use. Produced and accumulated litterfall from the Cerrado areas surrounding the palm swamps were collected from October 2014 to September 2015, and the Ca, Mg, K, and P concentrations were determined in the dry and rainy seasons. Soil samples were collected in the surrounding Cerrado and within the palm swamps until 100 cm soil depth to determine bulk density and soil C and N contents and stocks.Results: Annual litterfall production in the Cerrado surrounding palm swamps was similar in AD(3.58 Mg·ha^-1·year^-1) and CV(3.79 Mg·ha^-1·year^-1), and was lower in BG(2.84 Mg·ha^-1·year^-1), and was more intense during the dry season. Furthermore, litterfall accumulation was higher in CV(7.12 Mg·ha^-1·year^-1) and BG(6.75 Mg·ha^-1·year^-1), culminating in lower decomposition rates. AD showed the highest decomposition rate(0.60) due to its vegetation structure and conservation. The macronutrient contents from the production and accumulated litterfall had a low influence of the land use, decreasing in the following order: Ca > K > Mg > P. Soils in CV and BG palm swamp areas showed higher values of C and N contents, due to the use of land for agricultural crops and cattle raising in an extensive(rangeland) system. The BG palm swamp, showed the highest C(124.03 Mg·ha^-1) and N(10.54 Mg·ha^-1) stocks due to the land use history with different agricultural practices over time.Conclusions: The litterfall dynamics in the Cerrado surrounding palm swamps was more affected by climatic variables than the intensity of land use, but the litter de

关键词： Nutrient cycling Soil fertility Soil organic matter decomposition rate

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Efficiency of soil-applied ^(67)Zn-enriched fertiliser across three consecutive crops

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Pedosphere 2021年第4期31卷 531-537页

作者： Edson M.MATTIELLO Eduardo L.CANCELLIER Rodrigo C.DA SILVA Fien deGRYSE Roslyn BAIRD Mike J.MCLAUGHLIN department of Soil Science Universidade Federal de ViçosaViçosaMinas Gerais(Brazil) department of Soil Science Universidade Federal de LavrasMinas Gerais(Brazil) The University of Adelaide School of AgricultureFood and WineFertiliser Technology Research CentrePMB 1Waite CampusGlen Osmond SA 5064(Australia)

A very small amount of applied zinc(Zn) is taken up by crops, resulting in low recovery by plants. Adding elemental sulphur to zinc oxide(ZnO) fertiliser could improve Zn solubilisation and exert a higher residual effect on crops than soluble Zn sources. We produced an isotopically labelled Zn-elemental sulphur fertiliser and evaluated its performance in comparison to traditional Zn sources during sequential crop cultivation. Three ^(67)Zn-labelled fertilisers,ZnO, zinc sulphate(ZnSO_(4)), and ZnO co-granulated with elemental sulphur(ZnOS^(0)), were soil applied, and their contributions to the uptake of Zn by three consecutive crops, wheat, ryegrass, and corn, were assessed in a 294-d pot experiment. The contributions of Zn fertilisers followed the order: ZnSO_(4) > ZnO= ZnOS^(0). The relative contributions of Zn fertilisers were lower in the first crop than in the subsequent crops. The overall recovery of applied Zn by the three crops was higher for ZnSO_(4) than for ZnO and ZnOS^(0), reaching 1.56%, 0.45%, and 0.33% of the applied Zn, respectively. Zinc recovery by plants was very low, regardless of the source of Zn. Adding elemental sulphur to ZnO did not increase its effectiveness up to 294 d after application. Fertiliser contribution was higher for the subsequent crops than for the initial crop, indicating the importance of assessing the residual effects of Zn fertilisers.

关键词： agronomic biofortification elemental sulphur fertilizer residual effect plant uptake Zn bioavailability Zn fertilization Zn source

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Co-inoculation of selected nodule endophytic rhizobacterial strains with Rhizobium tropici promotes plant growth and controls damping off in common bean

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Pedosphere 2020年第1期30卷 98-108页

作者： Linnajara de VASCONCELOS MARTINS FERREIRA Fernanda de CARVALHO Júlia FONSECA COLOMBO ANDRAde Damiany PáDUA OLIVEIRA Flávio Henrique VASCONCELOS de MEdeIROS Fatima Maria de SOUZA MOREIRA Sector of Biology Microbiology and Biological ProcessesDepartment of Soil ScienceUniversidade Federal de LavrasLavras C.P.3037-37200-000(Brazil) Instituto federal do Pará/IFPA Campus MarabáRuralMarabáC.P.041-68508-979(Brazil) universidade federal de lavras Department of PhytopathologyLavras C.P.3037-37200-000(Brazil)

Production of common bean(Phaseolus vulgaris)is limited by the occurrence of damping off(rhizoctoniosis),which is caused by the fungus Rhizoctonia solani.However,the co-inoculation of plant growth-promoting rhizobacteria(PGPR)involved in biological control along with diatomic nitrogen(N2)-fixing rhizobia can enhance N nutrition and increase production.In this context,finding microorganisms with synergistic effects that perform these two roles is of fundamental importance to ensure adequate yield levels.The aim of this study was to evaluate the effects of co-inoculation of nodule endophytic strains of the genera Bacillus,Paenibacillus,Burkholderia,and Pseudomonas with Rhizobium tropici CIAT 899,an N2-fixing rhizobial strain,on the biocontrol of damping off and growth promotion in common bean plants.Greenhouse experiments were conducted under axenic conditions using the common bean cultivar Pérola.The first experiment evaluated the potential of the 14 rhizobacterial strains,which were inoculated alone or in combination with CIAT 899,for the control of R.solani.The second experiment evaluated the ability of these 14 rhizobacterial strains to promote plant growth with three manners of N supply:co-inoculation with CIAT 899 at low mineral N supply(5.25 mg N mL^-1),low mineral N supply(5.25 mg N mL^-1),and high mineral N supply(52.5 mg N mL^-1).The use of rhizobacteria combined with rhizobia contributed in a synergistic manner to the promotion of growth and the control of damping off in the common bean.Co-inoculation of the strains UFLA 02-281/03-18(Pseudomonas sp.),UFLA 02-286(Bacillus sp.),and UFLA 04-227(Burkholderia fungorum)together with CIAT 899 effectively controlled damping off.For the common bean,mineral N supply can be replaced by the co-inoculation of CIAT 899 with plant growth-promoting strains UFLA 02-281/02-286/02-290/02-293.Nodule endophytes UFLA02-281/02-286 are promising for co-inoculation with CIAT 899 in the common bean,promoting synergy with rhizobial inoculation and protection against disease.

关键词： Bacillus sp. biological control Burkholderia fungorum CIAT 899 Phaseolus vulgaris plant growth-promoting rhizobacteria Pseudomonas sp. Rhizoctonia solani

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Partitioning between primary and secondary metabolism of carbon allocated to roots in four maize genotypes under water deficit and its effects on productivity

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The Crop Journal 2015年第5期3卷 379-386页

作者： Alyne Oliveira Lavinsky Paulo Cesar Magalhaes Roniel Geraldo avila Mariana Melo Diniz Thiago Correa de Souza Embrapa Milho e Sorgo Sete LagoasMGCEP:35701-970Brazil universidade federal de lavras LavrasMGCEP 37200-000Brazil universidade federal de Sao Joao del Rey Sete LagoasMGCEP 35701-970Brazil universidade federal de Alfenas AlfenasMGCEP 37130-000Brazil

Plants may respond to drought by altering biomass allocation to shoots and roots or by changing the metabolic activities in these organs. To determine how drought changes the partitioning of carbon allocated to growth and secondary metabolism in maize roots and how it affects photosynthesis(A) and productivity in maize, we evaluated leaf gas exchange, yield componentes, root morphology, and primary and secondary metabolites including total soluble sugars(TSS), starch(S), phenolics(PHE), and lignin(LIG). Data were collected from pot-grown plants of four maize genotypes: BRS 1010 and 2B710(sensitive genotypes) and DKB390 and BRS1055(tolerant genotypes) under two soil water tensions: field capacity(FC,-18 kP a) and water deficit(WD,-138 kP a). WD was applied at the pre-flowering stage for 12 days and then the water supply was restored and maintained at optimum levels until the end of the cycle. For genotype BRS 1055 under FC, the greatest A did not result in greater grain biomass(DGB) because the accumulated photoassimilates had already filled the cells, and thus the excessive TSS synthesized in leaves was allocated to roots in large amounts. However, the sharp decrease in A caused by WD imposition in this genotype did not affect the influx pressure of leaf TSS, which was due largely to conversion of primary metabolites to PHE compounds to increase the length of fine roots. In leaves of DKB390 under WD, both S and TSS were reduced, whereas PHE were increased to prevent excessive water loss and xylem cavitation. Under WD, both BRS1010 and2B710 genotypes displayed reduced allocation of biomass to shoots and roots and LIG content in leaves, as well as lower A and DGB values. In BRS1010 this response was coupled to S decrease in leaves and TSS increase in roots, whereas in 2B710 there was a concomitant S increase in roots.

关键词： Starch Sugars Lignin Phenols WinRHIZO

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Vegetation structure and edaphic factors in veredas reflect different conservation status in these threatened areas

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Forest Ecosystems 2022年第3期9卷 387-395页

作者： Yule Roberta Ferreira Nunes Camila Silveira Souza Islaine Francielly Pinheiro de Azevedo Odirlei Simôes de Oliveira Leidivan Almeida Frazão Rúbia Santos Fonseca Rubens Manoel dos Santos Walter Viana Neves Programa de Pós-Graduaçao Em Botânica Aplicada Departamento de Biologia GeralUniversidade Estadual de Montes ClarosAvenida Dr.Ruy BragaS/N-Bairro Vila MauricéiaMontes ClarosMinas Gerais39401-089Brazil Laboratório de Ecologia Vegetal Universidade Estadual de Montes ClarosAvenida Dr.Ruy BragaS/N-Bairro Vila MauricéiaMontes ClarosMinas Gerais39401-089Brazil Instituto de Ciências Agrarias-universidade federal de Minas gerais Avenida Universitária1.000-Bairro Universit�arioMontes ClarosMinas Gerais39404-547Brazil departamento de Ciências Florestais Universidade Federal de LavrasCP 3037LavrasMinas Gerais37200-000Brazil Instituto Mineiro de Gestao dasÁguas Secretaria de Estado de Meio Ambiente e Desenvolvimento SustentávelAvenida JoséCorreia Machado900-Bairro IbiturunaMontes ClarosMinas Gerais39401-832Brazil

Background:In Cerrado humid areas,veredas are considered as hygrophilous communities,marked by the presence of the Mauritia flexuosa palm tree emerging in the wetter zones.Changes in veredas ecosystems due to drought and changes in the water table,which represent important areas for biodiversity maintenance in the Brazilian cerrado,can lead to the emergence of new landscapes and ecosystems.Assuming that the veredas are changed in species composition due to anthropogenic factors,in this study,we evaluated the flora composition and described the current vegetation profile of two veredas under different disturbances levels that are located in the north of Minas gerais State,Brazil.Results:Altogether,2,268 individuals of 91 species belonging to 36 families were recorded.Our results demonstrated that the studied veredas were floristically different in terms of the arboreous-shrubby species composition,richness,and diversity.despite the hygrophilous forest formations and open areas in the two veredas present typical species from these environments(same species with high importance values),the drought in the water table caused an expansion of Cerrado species in the open areas and in the hygrophilous forest.Furthermore,in the hygrophilous forest there was an increase in the abundance of species that occur in less saturated soils.Conclusion:Our results demonstrate that the studied veredas are changing in species composition due to anthropogenic factors which leads to the drought of these formations(water balance effect).These anthropogenic effects cause a modification with the expansion and increase in the abundance of typical species of other areas of Cerrado and resistant to less saturated soils,leading to the veredas collapse.Finally,future studies should investigate other veredas on a broader scale to detect changes in the water table that lead to a consequent change in vegetation structure.In this way,we will have support for the conscientious management and conservation of these areas that represent equilibrium plac

关键词： Cerrado Conservation Palm swamp Plant distribution Climate change Water balance effect Vereda drought Phytosociological analysis

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