23 documents found, page 1 of 3
Fluxes of CO 2 , CH 4 , and N 2 O in tundra-covered and Nothofagus forest soils...
Sá, Mariana Médice Firme; Schaefer, Carlos Ernesto G.R.; Loureiro, Diego C.; Simas, Felipe N.B.; Alves, Bruno J.R.; de Sá Mendonça, EduardoMade available in DSpace on 2019-10-06T16:12:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-04-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); While most soils in periglacial environments present high fluxes of CO 2 (F CO2 ), CH 4 (F CH4 ), and N 2 O (F N2O ), few of them have a tendency to drain greenhouse...
Active layer thermal monitoring of a Dry Valley of the Ellsworth Mountains, Con...
Schaefer, Carlos Ernesto G.R.; Delpupo, Caroline; Senra, Eduardo O.; Michel, Roberto F.M.; Bremer, Ulisses F.; Bockheim, James G.The Ellsworth Mountains are located along the southern edge of the Ronne-Filchner Ice Shelf and are subdivided by the Minnesota Glacier into the Heritage Range to the east, and the Sentinel Range to the west (Figure 1). The climate of the Ellsworth Mountains is strongly controlled by proximity to the Ronne-Filchner Ice Shelf and elevation. The entire ice free area is underlain by continuous permafrost of unknow...
Soil formation in Seymour Island, Weddell Sea, Antarctica
Souza, Katia Karoline Delpupo; Schaefer, Carlos Ernesto G.R.; Simas, Felipe Nogueira Bello; Spinola, Diogo Noses; Paula, Mayara Daher deThe Antarctic Peninsula marks the climatic transition between Maritime and Continental Antarctica. Ice-free areas at the western side of the Peninsula (Maritime Antarctica) have been increasingly studied in the last 10 years whereas soils on the eastern coast have been relatively less studied. The objective of the present study is to analyze the properties of soils developed on Seymour Island, in the Weddell se...
Chemical, physical and micromorphological properties of termite mounds and adja...
Sarcinelli, Tathiane Santi; Schaefer, Carlos Ernesto G.R.; Lynch, Leila de Souza; Arato, Helga Dias; Viana, João Herbert M.Little is known about the effects of neotropical mound-building termites in soil chemical and physical properties. The influence of soil termite activity on soil characteristics was studied by assessing chemical, physical and micromorphological properties of a toposequence of Latosols (Oxisols). Soil samples were collected from the walls and inner parts of termite mounds and also from adjacent soil. A high dive...
Impact of expected global warming on C mineralization in maritime Antarctic soi...
Carvalho, Juliana Vanir de Souza; Mendonça, Eduardo de Sá; Barbosa, Rui Tarcísio; Reis, Efrain Lázaro; Seabra, Paulo NegraisThis study concerned the fragility of maritime Antarctic soils under increasing temperature, using the C dynamics and structural characteristics of humic substances as indicators. Working with four representative soils from King George Island (Lithic Thiomorphic Cryosol (LTC1 and LTC2), Ornithogenic Cryosol (OG) and Gelic Organosol (ORG)) we evaluated the total organic C and nitrogen contents, the oxidizable C ...
Micromorphology and microchemistry of selected Cryosols from maritime Antarctica
Schaefer, Carlos Ernesto G.R.; Simas, Felipe N.B.; Gilkes, Robert J.; Mathison, Charter; Costa, Liovando M. da; Albuquerque, Miriam A.Little information is available on the microstructure of Cryosols from maritime Antarctica, and the present study characterizes the main soil types commonly found in ice-free areas of Admiralty Bay, King George Island. Four pedons were selected for micromorphological and microprobe analysis. The type of microstructure observed in the soils is strongly influenced by the lithological composition and arrangement, ...
Micromorphological and microchemical indicators of pedogenesis in Ornithogenic ...
Pereira, Thiago T.C.; Schaefer, Carlos Ernesto G.R.; Ker, João C.; Almeida, Cecília C.; Almeida, Ivan C.C.Micromorphological investigations of Antarctic soils are comparatively scarce, however, they could help understand the genesis of cryogenic soils under extreme polar conditions and different biotic factors. In most areas of Maritime Antarctica, the soil structure is apparently influenced by the local lithology, cryoturbation, guano deposition and reaction of guano solutions. The present study was carried out in...
Resistência hidráulica da crosta formada em solos submetidos a chuvas simuladas
Brandão, Viviane dos Santos; Silva, Demetrius David da; Ruiz, Hugo Alberto; Pruski, Fernando Falco; Schaefer, Carlos Ernesto G.R.Para avaliar a redução da taxa de infiltração em solos sujeitos ao encrostamento decorrente da aplicação de chuvas simuladas, foi realizado um experimento em esquema fatorial 5 x 6, sendo cinco solos (Argissolo Vermelho, Argissolo Vermelho-Amarelo, Latossolo Vermelho-Amarelo, Neossolo Flúvico e Neossolo Quartzarênico) e seis energias cinéticas de chuva (0, 525, 1051, 2102, 3153 e 4204 J m-2), com três repetiçõe...
Características químicas do lixo de formigueiros de Atta sexdens rubropilosa (H...
Guerra, Marcelo Braga Bueno; Schaefer, Carlos Ernesto G.R.; Sousa-Souto, LeandroAs saúvas (Atta spp.) estão amplamente distribuídas pelo continente Sul-Americano e são consideradas importantes componentes do ecossistema neotropical. Diversos estudos têm demonstrado o efeito de formigueiros no enriquecimento do solo e na facilitação ao estabelecimento de espécies vegetais. Possivelmente o enriquecimento do solo seja devido ao acúmulo de matéria orgânica decomposta em câmaras de descarte (li...
Avaliação do ambiente solo-semente por meio da tomografia computadorizada
Modolo, Alcir José; Fernandes, Haroldo Carlos; Naime, João de Mendonça; Schaefer, Carlos Ernesto G.R.; Santos, Nerilson TerraO condicionamento físico do solo ao redor das sementes reveste-se de grande importância para o bom desenvolvimento inicial da cultura, assegurando uma população sadia de plantas. O adequado contato solo-semente é um pré-requisito para a rápida emergência e o bom estabelecimento da cultura. Neste trabalho, objetivou-se utilizar a tomografia computadorizada de resolução milimétrica para determinação do ambiente s...