Biological and chemical attributes of soils under forest species in Northeast Brazil

Abstract

Timber forests contribute to the sustainable development of the biomes in tropical regions. The aim of this study was to evaluate the biological and chemical properties of the soil as a consequence of the cover with native and non-native species in the Acaraú basin, a transition area from the coast to the Brazilian semi-arid region. Areas planted with four native species (Anadenanthera colubrina, Astronium fraxinifolium, Handroanthus impetiginosus, Colubrina glandulosa) and three exotic species (Acacia mangium, Casuarina equisetifolia, Eucalyptus urophylla) plus a non-forested agricultural area were evaluated for organic carbon contents, and microbial and chemical soil properties. The levels of soil organic carbon were highest in A. colubrina and C. equisetifolia plantations. Low basal soil respiration was observed but the microbial biomass was particularly low in the non-forested area. In the C. equisetifolia, E. urophylla, and H. impetiginosus plantations, elevated soil metabolic quotients were found. The A. colubrina and H. impetiginosus plantations had the highest levels of easily extracted-glomalin related soil protein. Tree species affect concentrations of essential nutrients and the biological quality of the soil in different ways. They can also improve the biological and chemical properties of the soil in the coastal plains of tropical regions. Keywords Soil quality Á Brazilian timber species Á Eucalyptus Á Acacia Á Casuarina Project funding: Selection of species and definition of technical parameters for plantations of forest species in the State of Ceará, Brazil (Embrapa).

Effects of different legume green manures on tropical soil microbiology after corn harvest

“…Here, the soil basal respiration after corn harvest is relatively similar when compared to other treatments with inputs (Chen et al 2020) and elevated in soils of tropical native forest (Weber et al 2020). This high activity also led to increased metabolic quotients for all treatments after the corn harvest, which was only significant for the forage legumes calopo and stylo.…”

Assessing soil organic carbon, N and P stocks and its relation to soil properties in artificial canopy gaps in a managed oriental beech (Fagus orientalis L.) forest#

“…C, N and P are the three primary components that influence plant growth rates (M. Li et al., 2019). Chemical indexes and SOC, as well as biological markers such as microbial biomass, were applied to measure soil quality in the forest (Weber et al., 2020). Plants show changes in their own growth conditions by affecting soil properties such as soil organic matter, N and P (Shen et al., 2020).…”