Abstract
Abstract This study aimed to assess soil chemical attributes, organic matter fractions and carbon stocks of forest in three different regeneration stages in the Serra de Itabaiana National Park, Sergipe. The study was conducted in three areas: open white sands, intermediate white sands, and closed white sands, with a history of differentiated degradation. Soil samples were collected at 0-20 cm depth for chemical characterization and for fractionation of soil organic matter and C stock. The open white sands obtained the best results regarding levels of macronutrients, total organic carbon, and total soil nitrogen, as well as higher carbon/nitrogen ratio compared with intermediate white sands and closed white sands, with such effects being attributed to recent exposure to fire. Carbon concentrations in humic fractions of organic matter were little influenced by different vegetation in regeneration, except the carbon fraction of humic acid, which is more sensitive to different management and soil usage.
Highlights
AND OBJECTIVESSoil organic matter (SOM) conservation has been used as an essential indicator of soil organic matter for its relationship with numerous chemical, physical and biological properties
The open white sands obtained the best results regarding levels of macronutrients, total organic carbon, and total soil nitrogen, as well as higher carbon/nitrogen ratio compared with intermediate white sands and closed white sands, with such effects being attributed to recent exposure to fire
For the concentrations of potassium (K), magnesium (Mg), and percentage of saturation by bases (V), the significant superiority of the open white sands (OWS) and closed white sands (CWS) areas was verified in relation to the intermediate white sands (IWS) area (Table 1)
Summary
AND OBJECTIVESSoil organic matter (SOM) conservation has been used as an essential indicator of soil organic matter for its relationship with numerous chemical, physical and biological properties. The fractions belonging to the humic substances are dynamic as they reflect changes in soil management. Few studies on these substances do not confirm the influence of carbon on HS fractions regarding soil fertility (Rodrigues et al, 2017). The presence of organic matter and its humid fraction may be compromised by specific anthropic actions such as fire, influencing the soil fertility. In forest ecosystems, the occurrence of fire has a lasting effect, both in the microbial composition as well as in the soil organic matter. These changes may interfere with all soil carbon dynamics (Araya et al, 2017)
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