Physical fractions of organic matter and mineralizable carbon of the soil in forest fragments of the Cerrado biome
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.007.0005Keywords:
C-CO2 emission, Carbon index, Organic matter labilityAbstract
The objective of the study was to quantify the physical-granulometric fractions of organic matter and the mineralizable carbon of the soil from forest fragments of the Cerrado biome in the municipalities of Aquidauana and Anastácio, MS. Soil samples were collected in two forest fragments and areas of permanent pasture (PP) around. For fragments, samples were collected at 3 internal points: fragment edge (FE), half radius (HR) and fragment center (FC), plus a point around the fragments, in areas of permanent pasture (PP). The levels of total organic carbon (TOC), carbon of particulate organic matter (C-POM) and mineral (C-MOM) were determined, with subsequent calculations of their respective stocks, in addition to the carbon stock index (CSI), lability (L), lability index (LI) and carbon management index (CMI), and analysis of mineralizable carbon (C-CO2). The highest levels of TOC were presented at point HR 23.77 g kg-1 in fragment 1, and at points FE 16.41 g kg-1 and FC 16.18 g kg-1 in fragment 2. The highest levels of C-POM were observed in the superficial layer, with an increase in C-MOM due to an increase in depth, reaching 86% of representativeness. The total emission of C-CO2 indicates as greater amounts at points FE on fragment 1 and FE and HR on fragment 2. The conversion of native areas into PP did not influence TOC. There was a greater representativeness of C-MOM in relation to C-POM, however the conversion of native areas to PP compromised the microbial activity of the soil.
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