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61 results

Isolation, Characterization and Symbiotic Efficiency of Nitrogen-Fixing and Heavy Metal-Tolerant Bacteria from a Coalmine Wasteland

Paulo Ademar Avelar Ferreira, Sabrina de Fatima Barbosa Dahmer, Tais Backes, Andressa de Oliveira Silveira, Rodrigo Josemar Seminoti Jacques, Mohsin Zafar, [...]

05/Sep/2018

ABSTRACT: Areas affected by coal mining can be recovered by revegetation with leguminous plants associated with nitrogen-fixing bacteria. This study addressed the isolation and characterization of native nitrogen-fixing bacteria from coalmine wasteland under different vegetation restoration approaches using Macroptilium atropurpureum (DC) Urb and Vicia sativa L. as trap plants. The bacteria were characterized and identified on the basis of 16S rRNA sequences. Additionally, nitrogen-fixing strains were characterized for tolerance to high heavy metal and low pH levels, as well as […]

Morphological Diversity of Springtails in Land Use Systems

Marcielli Aparecida Borges dos Santos, Luís Carlos Iuñes de Oliveira Filho, Pâmela Niederauer Pompeo, Danielle Cristina Ortiz, Álvaro Luiz Mafra, Osmar Klauberg Filho, [...]

05/Sep/2018

ABSTRACT: Springtails (Collembola) are soil organisms with wide morphological diversity and are sensitive to alterations in the soil, regardless of whether they are human-caused or not. The aim of this study was to evaluate the influence of land use on the morphological diversity of springtails and verify their relationships with soil physical, chemical, and microbiological properties. Samples were collected in the eastern region of Santa Catarina, in three municipalities: Joinville, Blumenau, and Timbó. They included the following land use systems […]

Spiders (Arachnida: Araneae) in Agricultural Land Use Systems in Subtropical Environments

Marcio Gonçalves da Rosa, Júlio Cesar Pires Santos, Antônio Domingos Brescovit, Álvaro Luiz Mafra, Dilmar Baretta

06/Aug/2018

ABSTRACT Changes in land use management in agricultural areas can affect the biodiversity of spider families. This study aimed to evaluate spider diversity in different land use systems with capture by two sampling methods, and to identify soil properties that can modulate the occurrence of spiders. Five land use systems, representative of traditional agricultural areas, were evaluated in the west of Santa Catarina, Brazil, to establish a scale of land use intensity: native forest, eucalyptus reforestation areas, pastures, crop-livestock integration […]

Occurrence of Yeast Species in Soils under Native and Modified Vegetation in an Iron Mining Area

Geisianny Augusta Monteiro Moreira, Helson Mario Martins do Vale

23/Jul/2018

ABSTRACT Soils of the Quadrilátero Ferrífero are rich in mineral resources, especially gold and iron. Soil management and mining activities greatly impact soil biology. However, studies addressed to the diversity of microorganisms and their ecological role in the recovery of these areas are scarce. This study aimed to assess the yeast occurrence in soils with natural vegetation (Atlantic Forest, neotropical savanna, and iron outcrop) and areas with anthropogenic modifications (Eucalyptus stand and rehabilitated area) in the Quadrilátero Ferrífero region. We […]

Soil Biological, Chemical, and Physical Properties After a Wildfire Event in a Eucalyptus Forest in the Pampa Biome

Natielo Almeida Santana, Cedinara Arruda Santana Morales, Diego Armando Amaro da Silva, Zaida Inês Antoniolli, Rodrigo Josemar Seminoti Jacques

17/Jul/2018

ABSTRACT Wildfire events cause considerable environmental disturbance but few studies have examined changes in soil properties due to fire. This study aimed to assess the effect of a wildfire event on chemical, physical, and biological properties of the soil in a eucalyptus forest in the Pampa biome. Part of a seven-year-old eucalyptus forest was affected by a wildfire event that lasted for two days. Soil and plant litter sampling was performed in three areas: in the forest that was not […]

Ajmalicine Bioproduction in Catharanthus Roseus (L) G. Don Inoculated with Arbuscular Mycorrhiza and Fertilized with Nitrogen

Cecília Silva Monnerat, Marta Simone Mendonça Freitas, Ivo José Curcino Vieira, Marco Antônio Martins, Almy Junior Cordeiro de Carvalho, Paulo Cesar dos Santos, [...]

17/Jul/2018

ABSTRACT Catharanthus roseus (L) G. Don (Madagascar periwinkle) belongs to the Apocynaceace family and is widely spread throughout tropical and subtropical regions of the world. The plant produces several important alkaloids, such as ajmalicine and serpentine, which are used in the treatment of circulatory diseases. The potential of inoculation with arbuscular mycorrhizal fungi (AMF) and nitrogen fertilization to enhance the production of alkaloids was investigated in periwinkle. A greenhouse experiment was carried out to evaluate the effects of arbuscular mycorrhizal […]

Effects of Long-Term Fertilization Management Practices on Soil Microbial Carbon and Microbial Biomass in Paddy Soil at Various Stages of Rice Growth

Yilan Xu, Haiming Tang, Xiaoping Xiao, Weiyan Li, Chao Li, Geng Sun, [...]

20/Apr/2018

ABSTRACT Soil microbial biomass plays a significant role in soils, and it is often used as an early indicator of change in soil quality. Soil microbial biomass is affected by different fertilization management practices. Therefore, the impact of different long-term fertilization management practices on the soil organic carbon (SOC) content, soil microbial biomass carbon (SMBC), and soil microbial biomass nitrogen (SMBN), as well as the soil microbial quotient (SMQ) in the tilled layer (0.00-0.20 m) were studied in the present […]

Spatial Variability of Soil Fauna Under Different Land Use and Managements

Raimunda Alves Silva, Glécio Machado Siqueira, Mayanna Karlla Lima Costa, Osvaldo Guedes, Ênio Farias de França e Silva

19/Mar/2018

ABSTRACT Geostatistics allows the evaluation of the distribution pattern of data with high spatial variability in agricultural systems. This study aimed to evaluate the spatial variability of biological diversity indices of soil fauna under different land (agriculture and forest). Samples were collected in seven areas (millet, soybean, corn, eucalyptus, pasture crops, and preserved and disturbed Cerrado), in Maranhão state, Brazil. The soil fauna was caught trapped in pitfall traps, installed 3 m away from each other. In each area, 130 […]

Tolerance to and Accumulation of Cadmium, Copper, and Zinc by Cupriavidus necator

Rayssa Pereira Vicentin, Jessé Valentim dos Santos, Cláudia Regina Gontijo Labory, Amanda Monique da Costa, Fatima Maria de Souza Moreira, Eduardo Alves

02/Mar/2018

ABSTRACT Preliminary results of in vitro experiments with multicontaminated soils and solid media indicated that nodulating diazotrophic bacteria of the genus Cupriavidus are promising for the remediation of contaminated environments due to their symbiosis with legumes and metal tolerance. Thus, strains of Cupriavidus spp. (LMG 19424T, UFLA 01-659, UFLA 01-663, and UFLA 02-71) were tested for their ability to tolerate and bioaccumulate cadmium (Cd), copper (Cu), and zinc (Zn) in Luria-Bertani broth. Changes in the growth pattern of Cupriavidus strains […]

Termite Mounds Effects on Soil Properties in the Atlantic Forest Biome

Sandra Santana de Lima, Marcos Gervasio Pereira, Renato Nunes Pereira, Rafael Moura de Pontes, Celeste Queiroz Rossi

02/Mar/2018

ABSTRACT Termites have peculiar activities in the soil, inducing significant changes in the soil properties. The objective of this study was to assess physical and chemical properties and soil organic matter to evaluate the effect of termite activity and termite mounds on the soil. Two toposequences were selected and divided in slope thirds (shoulder, backslope, and footslope). In each of these, four termite mounds were selected. Samples were taken from the soils and termite mounds (top, center, and base) along […]

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