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6 results

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 […]

Phosphorus Forms in Sediments as Indicators of Anthropic Pressures in an Agricultural Catchment in Southern Brazil

Tales Tiecher, Ricardo Bergamo Schenato, Maria Alice Santanna, Laurent Caner, Danilo Rheinheimer dos Santos

21/Nov/2017

ABSTRACT Phosphorus (P) fractionation is a suitable procedure to ascertain P lability in sediments and is able to distinguish sources of P under different soil management practices in a catchment. Brazil is the second largest producer and the largest exporter of tobacco in the world. Inadequate management of cultivated areas exposes the soil to erosion processes, accelerating the transfer of sediment and P to water bodies, which leads to eutrophication. We evaluated the P forms in suspended sediments collected at […]

Carbon Stock and Natural Abundance of 13C as a Function of Conversion of Forest and Grassland Areas in Southern Brazil

Denilson Dortzbach, Marcos Gervasio Pereira, Éverton Blainski, Antonio Paz González

01/Dec/2015

ABSTRACT Conversions of plant cover resulting from management practices may alter carbon storage and the natural abundance of 13C. The aim of this study was to evaluate C stocks and natural abundance of C (δ13C) in areas of forest (F) and pasture (P) sequences with different times of usage in an Atlantic Forest area, Santa Catarina, Brazil. Seven usage sequences of forest (F) and pasture (P) were defined through aerial photographs taken in 1957, 1978, and 2008; through interviews with […]

SOIL QUALITY IN RELATION TO FOREST CONVERSION TO PERENNIAL OR ANNUAL CROPPING IN SOUTHERN BRAZIL

Elcio Liborio Balota, Ines Fumiko Ubukata Yada, Higo Furlan Amaral, Andre Shigueyoshi Nakatani, Mariangela Hungria, Richard Peter Dick, [...]

01/Jul/2015

Many forested areas have been converted to intensive agricultural use to satisfy food, fiber, and forage production for a growing world population. There is great interest in evaluating forest conversion to cultivated land because this conversion adversely affects several soil properties. We examined soil microbial, physical, and chemical properties in an Oxisol (Latossolo Vermelho distrófico) of southern Brazil 24 years after forest conversion to a perennial crop with coffee or annual grain crops (maize and soybeans) in conventional tillage or […]

SOIL ORGANIC MATTER FRACTIONS IN PRESERVED AND DISTURBED WETLANDS OF THE CERRADO BIOME

Ricardo Fernandes de Sousa, Eliana Paula Fernandes Brasil, Cícero Célio de Figueiredo, Wilson Mozena Leandro

01/Jan/2015

Veredas are humid tropical ecosystems, generally associated to hydromorphic soils and a shallow water table. The soils of these ecosystems are affected by the use of the areas around these veredas. The objective of this study was to determine soil organic matter (SOM) fractions in veredas adjacent to preserved (native savanna) and disturbed environments (agricultural areas and pastures) in the Cerrado biome. Soil samples were collected from the 0-10 and 10-20 cm layers along reference lines drawn along the relief […]

DISTRIBUTION OF ORGANIC CARBON IN DIFFERENT SOIL FRACTIONS IN ECOSYSTEMS OF CENTRAL AMAZONIA

Jean Dalmo de Oliveira Marques, Flávio Jesus Luizão, Wenceslau Geraldes Teixeira, Max Sarrazin, Sávio José Filgueira Ferreira, Troy Patrick Beldini, [...]

01/Jan/2015

Organic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. The aim of the present study was to determine the quality and quantity of organic C in different compartments of the soil fraction in different Amazonian ecosystems. The soil organic matter (FSOM) was fractionated and soil C stocks were estimated in primary forest (PF), pasture (P), secondary succession (SS) and an agroforestry system […]