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- Title
ESTOQUES DE CARBONO E NITROGÉNIO EM ARGISSOLO SUBMETIDO AO MONOCULTIVO DE Eucalyptus urograndis E EM ROTAÇÃO COM Acacia mangium.
- Authors
Facco Pegoraro, Rodinei; Ribeiro da Silva, Ivo; Ferreira de Novais, Roberto; de Barros, Nairam Felix; Bertola Cantarutti, Reinaldo; Fonseca, Sebastião
- Abstract
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 N, 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 short-rotation Eucalyptus "urograndis", long rotation plantations and stands of Acacia mangium which succeeded short rotation eucalyptus monoculture, in comparison to the soil of native forest (Atlantic Forest). 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 short rotation eucalyptus cultivation 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 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 short r otation eucalypt.
- Subjects
HUMUS; SOIL management; BIOMASS; NITROGEN; HUMIC acid
- Publication
Ciência Florestal (01039954), 2014, Vol 24, Issue 4, p935
- ISSN
0103-9954
- Publication type
Article
- DOI
10.5902/1980509816607