The quantification of root biomass and the assessment of its dynamics in forest ecosystems has been intensified due to its important role in carbon sequestration and storage and the possible consequences under climate change conditions. In general, biomass stocks between and within forest ecosystems are highly variable. It is necessary to study all the different components of vegetation, however, the vast majority of the works found in the literature, address only the biomass of the aerial part of the plants, with few studies involving the quantification of these stocks by the roots, in the different ecosystems. The present study objective quantify and classify a root biomass with a depth of 0 to 10 cm, and to monitor accumulated litter in the soil (litter pool), in two different regions, in the Pantanal (Acurizal) and in the Cerrado (Sensu stricto) Mato-Grossense. The root biomass was obtained by means of unformed soil samples (0-10 cm) and the roots were classified by diameter, with the aid of digital calipers, between thick (> 10 mm), medium (5-10 mm), slightly thin (2-5 mm) and fine (<2 mm). The samples collected monthly between August 2018 and July 2019. Was observed that in both areas, about 90% of the roots collected, were fine (<2 mm). The root density in Acurizal was on average 124.92 g/m² and in Sensu stricto it was on average 57.5 g/m². The difference in root density in the soil, between the two study areas, significant (p<0.05). However, there no significant difference in root density between the dry and wet periods in each area. The monthly average of litter pool in the area of Acurizal and Sensu stricto was, respectively: 526.52 g/m² and 588.96 g/m². In both areas, the accumulated litter was significantly different between periods of drought and precipitation.

The number of studies on the importance of Cerrado soil to biogeochemical cycles is growing, with this being the focus of most research in the Cerrado biome. The objective of this research was to verify the correlation among different chemical attributes of the soil in a Cerrado fragment located in Mãe Bonifácia Park, in Cuiabá, Mato Grosso (MT), Brazil, using principal components analysis. For this study, five soil samples were collected at 0-10 cm depth monthly from August 2015 to July 2016. After the collection and identification of the soil, chemical analyses were performed to determine the following chemical characteristics of the soil: organic matter (OM), base saturation (V%), sum of bases (SB), cation exchange capacity (CTC), pH, and concentrations of H+, Al3+, Ca2+, Mg2+, K+, P, S, Cu, Mn2+, Mg2+, Zn, Fe2+ and B3+. The soil was characterized as acidic, which is typical for Cerrado soils, although some chemical elements were found in high concentrations. After the analysis of principal components, it was possible to reduce the seventeen original variables to four principal components that represented 88.86% of the total variation of the data. In which the first main component explained 41.18%, the second component explained 28.39%, the third 11.29% and the fourth explained 7.98%. Based on this analysis, it was identified that the chemical attributes such as the sum of base (SB), organic matter (OM), cation exchange capacity (CTC), calcium (Ca2+), saturation (V%) and pH represented the greater data variance.

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A preocupação com a exposição humana ao ruído ambiental de interiores é constante alvo de estudos, devido ao aumento de fontes geradoras de ruídos em meio urbano e o risco de efeitos psicofisiológicos a seus ocupantes. Neste cenário o ambiente veicular destinado ao transporte urbano de passageiros tem despertado grande interesse principalmente pelo fluxo constante de passageiros e por estarem sujeitos a eventos intrínsecos ao meio urbano como por exemplo o ruído de tráfego. Assim, este estudo avaliou a exposição humana ao ruído ambiental no interior de veículos do transporte público coletivo em Cuiabá, Mato Grosso, com o objetivo de investigar a salubridade e o conforto acústico. Foram monitoradas variações dos níveis de ruído (dB(A)) em três pontos predefinidos no interior veicular, nos horários matutino, vespertino e noturno em três dias úteis consecutivos no mês de agosto de 2018 e no mês de fevereiro de 2019. Para análise do conforto acústico utilizou-se o cálculo do Nível de ruído equivalente contínuo (Leq) e os Índices estatísticos de ruído L10 e L90, conforme Norma Técnica CETESB/L11.033 (1992), e os resultados comparados aos limites de tolerância estabelecidos pelo Ministério do Trabalho e Emprego (NR-15 e NR-17) e Organização Mundial de Saúde (OMS). Em todas as amostragens foram observados valores estimados de L10 e L90 acima de 90 dB(A), divergindo aos limites preconizados pela OMS e NR-17, caracterizando o ambiente como muito ruidoso e acusticamente desconfortável.  Isto posto, permite-se concluir  que o ambiente é potencialmente prejudicial  à saúde dos ocupantes do veículo, em particular ao posto de motorista.