Fertilization and Irrigation Affect Soil Carbon under Eucalyptus Plantation in the Cerrado

Fialho, Ricardo Cardoso; Teixeira, Rafael da Silva; Teixeira, Ana Paula Mendes; Reis, Thalles Guimarães; Silva, Ivo Ribeiro da

doi:10.1590/2179-8087.067917

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Original Article, Silviculture • Floresta Ambient. 26 (4) • 2019 • https://doi.org/10.1590/2179-8087.067917 copy

Fertilization and Irrigation Affect Soil Carbon under Eucalyptus Plantation in the Cerrado

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This study aimed: i) to evaluate the influence of fertilization and irrigation management on eucalyptus plantations for soil carbon (C) dynamics; ii) to evaluate the impact of fertilization and irrigation management on eucalyptus plantations in the C allocation in depth compared to the Cerrado biome. This study was carried out in an eucalyptus plantation at the end of the third rotation (7 years), which received different fertilizations and irrigations, and a Cerrado area was used as reference. Soil samples were collected in trenches and the gases (CO₂ and CH₄) on the surface. The total organic carbon (TOC) is more influenced by the availability of water than nutrients. Soils under eucalyptus stands are more efficient at C stocks in depth than the Cerrado and act as a liquid drain of CO₂ and CH₄ from the atmosphere.

Keywords:
CO₂; CH₄; carbon management index; planted forests

Depth	Cerrado	CN		FN		CI		FI
Depth	Cerrado	R	IR	R	IR	R	IR	R	IR
0-10	1.05	0.89	0.86	0.78	0.81	0.79	0.82	0.81	0.83
10-20	1.07	0.80	0.86	0.80	0.81	0.80	0.83	0.88	0.79
20-40	1.01	0.84	0.89	0.82	0.83	0.85	0.87	0.87	0.84
40-60	1.11	0.82	0.84	0.78	0.78	0.88	0.87	0.87	0.87
60-100	0.96	0.84	0.87	0.85	0.84	0.82	0.80	0.84	0.84

TOC
Soil layers	Cerrado	CN	FN	CI	FI
cm	Mg ha^-1
0-10	47.08 a	48.66 a	55.75 a	39.94 a	43.51 a
10-20	31.89 a	45.87 a	46.77 a	44.15 a	38.07 a
20-40	40.88 b	65.72 ab	73.33 a	63.41 ab	55.55 ab
40-60	34.52 c	56.81 ab	64.14 a	57.03 ab	50.81 b
60-100	39.06 b	79.74 a	85.32 a	80.12 a	80.23 a
TN
Soil layers	Cerrado	CN	FN	CI	FI
cm	Mg ha^-1
0-10	3.49 a	1.94 a	2.63 a	1.52 a	1.85 a
10-20	2.98 a	1.91 a	2.44 a	1.79 a	2.06 a
20-40	2.26 a	3.05 a	3.32 a	2.25 a	3.20 a
40-60	1.61 a	2.87 a	2.16 a	2.23 a	2.74 a
60-100	2.50 a	4.07 a	3.54 a	2.54 a	5.66 a
C:N ratio
Soil layers	Cerrado	CN	FN	CI	FI
cm	Mg ha^-1
0-10	14.12 b	24.96 ab	23.09 ab	33.49 a	23.83 ab
10-20	11.92 a	26.73 a	21.28 a	25.85 a	19.34 a
20-40	18.91 a	22.52 a	25.78 a	28.64 a	19.04 a
40-60	24.82 a	20.06 a	30.73 a	28.26 a	21.57 a
60-100	15.51 a	28.70 a	27.01 a	37.50 a	17.41 a
Labile-C
Soil layers	Cerrado	CN	FN	CI	FI
cm	Mg ha^-1
0-10	16.30 a	9.83 b	13.40 ab	9.84 b	11.23 ab
10-20	8.11 a	8.98 a	10.20 a	11.08 a	9.59 a
20-40	8.66 a	18.20 a	15.23 a	15.53 a	15.47 a
40-60	7.04 a	10.25 a	11.91 a	11.52 a	12.71 a
60-100	12.02 a	11.15 a	15.99 a	16.85 a	17.05 a

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] CORRESPONDENCE TO Ricardo Fialho Universidade Federal de Viçosa (UFV) Av. Peter Henry Rolfs, s/n, CEP 36570-000, Viçosa, MG, Brasil e-mail: ricardocfialho@gmail.com