CARBON AND NITROGEN STOCKS IN THE ALFISOL SUBMITTED TO THE <i>Eucalyptus urograndis</i> MONOCULTURE AND<i> Acacia mangium </i>ROTATION
DOI:
https://doi.org/10.5902/1980509816607Keywords:
organic matter, humic substances, light fraction, microbial biomass.Abstract
http://dx.doi.org/10.5902/1980509816607
The pursuit of sustainable systems of soil management has led researchers to develop new techniques of cultivation. Among them, studies with forest species able to fix atmospheric N2 and increase C and N stocks in labile and stable soil organic matter (SOM) stand out in Brazil. The study aimed to evaluate changes in stocks of C and N in fractions of humic substances, light fraction of SOM and microbial biomass in soils of Eucalypt urograndis short rotation, long rotation plantations and stands of the Acacia mangium which succeeded eucalyptus short rotation monoculture, with reference to the soil of native forest (Atlantic Forest) adjacent. It was obtained the total organic carbon (TOC) and total nitrogen (TN) stocks, C and N stocks in the fractions of humic substances (fulvic acid fraction-AF, humic acid fraction-HA and humin fraction-H), C and N in light fraction of SOM (C-LOM and N-LOM) and C and N microbial biomass (C-MB and N-MB). The results indicated that the eucalyptus cultivation of short rotation reduced total organic carbon stocks, total nitrogen, C and N in the humic substances, and N storage in the microbial biomass compared to Acacia mangium soil. The cultivation of Acacia mangium and the increase of the eucalyptus rotation time have increased stocks of C and N of the labile (C-LOM, N-LOM and C-MB) and stable fractions (C and N in humic substances) indicating a significant recovery of their stocks to levels approaching those original (native), and higher than stocks obtained in the soil of eucalyptus short rotation.
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