Soil Organic Matter Fractions Under Eucalypt Plantation in Reform Management

Soares, Emanuelle Merces Barros; Teixeira, Rafael da Silva; Sousa, Rodrigo Nogueira de; Vasconcelos, Aline de Almeida; Silva, Ivo Ribeiro da

doi:10.1590/2179-8087.069417

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Original Article, Forest Management • Floresta Ambient. 26 (2) • 2019 • https://doi.org/10.1590/2179-8087.069417 copy

Soil Organic Matter Fractions Under Eucalypt Plantation in Reform Management

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Harvesting and reform in eucalyptus can lead to changes in soil organic matter (SOM). The objective of this work was to evaluate the changes in total organic C (TOC) and N (NT), C and N in humic acid (HA), fulvic acid (FH), light organic matter (LOM) and microbial biomass (MB), in Ultisol of eucalypt stands over one, two and four years of renovated areas in Rio Grande do Sul state. After the first year of eucalyptus reform, there were 78% of increases in TOC (0.0-1.0-m soil layer). After two years, there was an increase in TN and an average reduction of 52% in LOM-C (0.0-0.1-m soil layer). FA-C, HA-C, and HU-C presented mean reductions of 43 Mg ha^–1 (0.0-1.0-m soil layer) after four years of reform. The litter contribution of previous crop and the crop residues from the harvest resulted in increments of the SOM fractions. However, there is a negative effect in later years.

Keywords:
forest soils; reform; humic substances; microbial biomass; light organic matter

Land use	pH	Ca	Mg	Al	H+Al	P	K	CEC_{pH 7.0}
Land use	.................... cmol_c dm^–3 .......................					.... mg dm^–3 ....		cmol_c dm^–3
Native Vegetation	4.59	0.81	0.83	1.89	5.79	3.23	43.21	7.43
Euc R0	4.45	2.39	1.34	2.02	7.25	7.33	153.29	10.98
Euc R1	4.16	0.13	0.29	4.29	11.30	10.15	113.35	11.72
Euc R2	4.05	0.35	0.43	4.54	8.87	14.31	55.19	9.65
Euc R4	4.25	1.27	0.81	2.90	6.60	13.17	105.36	8.68

Land Use	Soil Layer	Sand	Silt	Clay	Ds
Land Use	........ m ........	............... g kg^–1 ...............			.... kg dm^–3 ....
Native vegetation	0.0-0.1	450.00	160.00	390.00	1.01
	0.1-0.2	450.00	150.00	400.00	0.86
	0.2-0.4	380.00	150.00	470.00	0.78
	0.4-0.6	370.00	120.00	510.00	0.76
	0.6-1.0	340.00	130.00	530.00	1.31
Euc R0	0.0-0.1	380.00	200.00	420.00	0.69
	0.1-0.2	440.00	170.00	390.00	0.72
	0.2-0.4	540.00	200.00	260.00	0.99
	0.4-0.6	590.00	160.00	250.00	1.08
	0.6-1.0	520.00	200.00	280.00	1.17
Euc R1	0.0-0.1	310.00	140.00	550.00	1.01
	0.1-0.2	300.00	120.00	580.00	1.04
	0.2-0.4	350.00	80.00	570.00	0.77
	0.4-0.6	280.00	90.00	630.00	0.79
	0.6-1.0	190.00	110.00	700.00	0.71
	0.0-0.1	490.00	180.00	330.00	0.87
Euc R2	0.1-0.2	450.00	170.00	380.00	0.84
	0.2-0.4	440.00	180.00	380.00	0.96
	0.4-0.6	420.00	160.00	420.00	0.93
	0.6-1.0	410.00	160.00	430.00	0.83
	0.0-0.1	460.00	110.00	430.00	1.07
Euc R4	0.1-0.2	440.00	90.00	470.00	1.02
	0.2-0.4	270.00	110.00	620.00	0.88
	0.4-0.6	190.00	170.00	640.00	0.77
	0.6-1.0	190.00	210.00	600.00	0.84

Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro Rodovia BR 465 Km 7, CEP 23897-000, Tel.: (21) 2682 0558 | (21) 3787-4033 - Seropédica - RJ - Brazil
E-mail: floram@ufrrj.br

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[1] Rafael da Silva TeixeiraDepartamento de Solos, Universidade Federal de Viçosa – UFV, Av. PH Rolfs, s/n, CEP 36570-000, Viçosa, MG, Brasil e-mail: teixeiramarky@yahoo.com.br