000			02385nab a2200325 i 4500
003			BR-BrBNA
005			20260512150044.0
008			260512b2020 bl.qr|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aP32
072			_aP33
100			_aFontana, Ademir
100			_aPereira, Marcos Gervasio
100			_aBalieiro, Fabiano de Carvalho
100			_aChagas, Cesar da Silva
100			_aDonagemma, Guilherme Kangussu
100			_aOliveira, Lucienne Silva de
245			_aResistance of Soil Organic Matter in “Humic A Horizons” of the Mountainous Region in the State of Rio De Janeiro
500			_aPublicação on-line; 36 ref.; 2 tables; 3 illus.; Summary (En)
520			_a ABSTRACT Soils with high organic carbon content, such as those with “humic A horizon”, occur in different regions of Brazil. This study aimed to determine the quantitative and qualitative characteristics of organic matter regarding the humic A horizon under different land uses in Bom Jardim, in Rio de Janeiro State, Brazil. Samples from forest, pasture, Eucalyptus plantation, coffee cultivation, olericulture, and also passion fruit soils were sampled and analyzed. In October 2011, undisturbed samples from humic A horizons, were collected for soil density analysis. In addition, disturbed samples were collected for the determination of organic carbon (Corg) content, total carbon, humic substance fractions contents and natural abundance of 13Carbon (δ13C). Low Corg contents were observed in areas under olericulture, pasture and passion fruit cultivation. The fulvic acid fraction was higher than other fractions, regardless of land use. The small variability in δ13C indicated maintenance of original Corg and suggest high resistance of Soil Organic Matter in humic A horizons. Keywords: organic carbon, humic substances, isotopic composition.
650			_aSOLO
650			_aCARBONO
650			_aCOMPOSIÇÃO QUÍMICA
650			_aISÓTOPO
650			_aMATÉRIA ORGÂNICA
773	0		_02929 _9347956 _dRio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994 _o2025-0455 _tFloresta e Ambiente (Brazil) _x1415-0980 / ISSN 2179-8087 0nline _gv. 27(1) p. 1-9; (2020) _wBR2026001224
856			_uhttps://www.scielo.br/j/floram/a/vSDStL9B9cWqvmH6yvFpGRM/?format=pdf&lang=en
942			_cANA
999			_c341777 _d341777