Variação temporal dos atributos microbiológicos do solo sob diferentes usos

Abstract

Compreender o comportamento e a dinâmica dos microrganismos do solo ajuda a avaliar as práticas de uso do solo que mantém e/ou melhoram a qualidade deste ao longo do tempo. O objetivo deste trabalho foi avaliar a qualidade do solo de diferentes áreas com base na biomassa microbiana, respiração basal e índices derivados (quociente metabólico e quociente microbiano) em dois períodos de amostragem. Quatro amostras compostas oriundas de três subamostras de solo foram coletadas nos anos de 2012 e 2014 na camada de 0,00-0,10 m em sete áreas distintas, sendo cinco áreas em restauração ecológica, um remanescente de floresta nativa e uma área de cultivo de cana-de-açúcar. Os dados foram submetidos à análise de variância, aplicando-se fatorial, sendo as médias comparadas pelo teste de Tukey, a 5% de significância e análise multivariada, por meio da agrupamento (Cluster Analysis). Os resultados indicam que, embora o tempo de resiliência das áreas em restauração ecológica seja relativamente curto, o desenvolvimento da cobertura vegetal e o estabelecimento da comunidade microbiana foram importantes para promover a melhoria da qualidade do solo.

Soil Microbiological Attributes Under Ecological Restoration Technologies in Subtropical Forest

“…In recent years, many studies have been carried out in Brazil on microbiological attributes in soils under native forests [4,23,24,30]. When comparing them with the data from the present study, it appears that CMIC, MICq, basal respiration and qCO2 were worse in the evaluated soil under native forest (Atlantic Forest) than under Cerrado forest [23] and the Amazon forest [30].…”

“…Among the three ecological restoration technologies evaluated, only nucleation obtained two (SBR and qCO2) of the six evaluated soil microbiological attributes equal to those obtained in the soil under native forest. The higher levels of CMIC, NMIC, MICq and fungal spores found in the soil under native forest are justified by the higher OCC content and quality, MICq which indicates the quality of soil organic matter [4]. In native forest areas there is a higher volume of litter and roots, which promote increased species diversity [29], organic matter content and nutrient availability [7].…”

“…Before recovering an area, it is necessary to know how regeneration occurs in those environments that have been subjected to different disturbances, whether natural or anthropic [3], once they present different levels of intensity, duration and resilience [4]. The recovery of degraded areas is a multi-step procedure that needs to be developed simultaneously in order to restore its productive capacity [5].…”

Linear and spatial variability of eucalyptus dendrometric attributes correlated with the properties of a Typic Haplustox soil (Oxisol) in the Brazilian savannah

“…Santos et al (2018) obtained a value close to ours [5.44 mg CO 2 -C. mg C-MB -1 kg -1 h -1 ).10 3 ], which is considered low. According to Novak et al (2018), the lower the qCO 2 , the more efficient the use of C by microbial biomass, and the lower the C losses in the form of CO 2 . Hence, higher qCO 2 values indicate a greater consumption of readily mineralizable C, increasing CO 2 losses, which is undesirable (Pizzani, Schaefer, Deloss, Pelizzon, & Aleluia, 2018).…”

Hydro-Microbiological Attributes of the Soil in Edge of Seasonal Semideciduous Forest Fragment

“…The biological properties of the soil are related in different ways in different areas and periods (Novak et al, 2018), that is, the type of soil in the region, climate, vegetation and anthropic action act on the quantity, diversity, and quality of the carbon present in the soil. Thus, the assessment of the microbial biomass carbon (MBC) and basal respiration (BR) are important subsidies to better understand the dynamics of the transformation processes of organic waste in the soil (Segatto et al, 2012).…”