Microbial Properties of Soil in Different Coverages in the Colombian Amazon

Abstract

Changes in coverage affect the activity of soil's microbial communities, affecting the carbon and nitrogen cycle. The variability of biochemical properties in different coverages (native forest, forest plantation, silvopastoral system and pasture) located in the northwest of the Colombian Amazon was evaluated. Edaphic properties were determined as: organic carbon (OC), total nitrogen (TN), microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) using the fumigation method. A significant effect was found to land use × depth interaction for the variables moisture, pH, CO and MBC/OC ratio (p < 0.05), while MBC and dCO 2 showed differences only for land use and NT, MBN and MBN/TN ratio at depth (p < 0.05). In general, when modifying the soil cover, changes were made in the chemical properties that affected the microbial activity.

Could cattle ranching and soybean cultivation be sustainable? A systematic review and a meta-analysis for the Amazon

“…The improvement of soil fertility and nutrient cycling in agroforestry systems has also been observed in Europe (Torralba et al 2016). In addition to the chemical components (nitrogen, phosphorous and sodium), our results indicated that SP practices also enhanced soil microbial and macro fauna abundance and diversity, a very important though often overlooked indicator of soil fertility (Barros et al 2003, Cruz et al 2019. Additionally, SP practices also reduced the potential of nitrification, a critical process in many agricultural fields (Cubillos et al 2016).…”

“…In the silvopasture systems, the presence of trees directly improve the carbon translocation from the sub-soil, both as foliage decay and as deposition of woody material (e.g., branches). Additionally, trees increase soil humidity and protection from erosion, as well as enhance the abundance and diversity of soil organisms (fungi, bacteria, micro-arthropods), facilitate decomposition and, consequently, carbon accumulation (Cruz et al 2019, Petter et al 2017. Crop rotation and pasture improvement also enhanced the SOC content, indicating that even in the absence of trees these practices are beneficial for soil quality (Mosquera et al 2012).…”

Impacts of land-use change on soil microbial communities and their function in the Amazon Rainforest

“…Older pastures in this study (5-12 years) did not accumulate significant soil C or MB C, but metabolic quotients did return to reduced levels similar to forests, indicating shifts in C usage by microbial communities over time as soil pools change in their quality and composition. Other studies have found that MB C typically increases at depths to 20 cm with pasture conversion and variable pasture age (Cenciani et al, 2009;Cruz et al, 2019). Overall, however, concentrations of MB C across pastures may vary eight-fold based on season (dry versus wet) and soil type, accounting for differences across studies and potentially influencing how microbial communities respond to land-use change (Cerri et al, 2006).…”

Óleos essenciais de espécies de Eugenia do Cerrado: composições químicas sazonais, modificações químicas no β-cariofileno e avaliação da atividade acaricida

“…Do ponto de vista da composição química, a característica básica de plantas da família Myrtaceae, conhecidas por serem ricas em óleos essenciais e pelo uso na medicina tradicional, 124 é a presença de taninos, flavonóides, monoterpenos, sesquiterpenos, triterpenos, cromenos, estilbenóides, dentre outros. 133 Figura 12. Perfil químico de amostras de espécies da família Myrtaceae.…”