Nutrient Cycling in <i>Corymbia citriodora</i> in the State of Rio de Janeiro, Brazil

Cunha, Gláucio Mello; Gama-Rodrigues, Antonio Carlos; Gama-Rodrigues, Emanuela Forestieri; Moreira, Gisele Rodrigues

doi:10.1590/2179-8087.020417

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Original Article, Silviculture • Floresta Ambient. 26 (2) • 2019 • https://doi.org/10.1590/2179-8087.020417 copy

Nutrient Cycling in Corymbia citriodora in the State of Rio de Janeiro, Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The quantification and transfer of nutrient stock among compartments in the forest environment is the key to understanding the nutrient cycling process. The aim of this study was to quantify the nutrient stock and dynamics by litter deposition in a Corymbia citriodora settlement in the Mountainous region of the State of Rio de Janeiro. Different plant parts, deciduous material and litter were chemically analyzed for nutrients. The biomass of trees was 127.23 Mg ha^-1, making up about 85.8% of the nutrient stock. On average, the nutrient flux represented 13.6% of nutrients stored in the biomass above the soil. The nutrient cycling process involving N, P, K Ca, and Mg in the long-rotation Corymbia citriodora crop represents an important strategy for maintaining productivity of the forest site.

Keywords:
litter; eucalyptus; nutrient stock; forest sustainability

Depth	pH	C	P		Ca
cm	pH	g kg^-1	Mg kg^-1		^________ cmol_c kg^{-1 _____________}
0-5	4.50	20.9	5.7	174	1.82	1.59	0.27	6.61
5-10	4.31	17.5 b	5.1	122	1.10	1.33	0.46	5.80

Fraction	N	P	K	Ca	Mg	C
Fraction	^{___________________________} kg ha^{-1 _______ __________________________}
Leaf	64 (37.6)	2.7 (1.6)	35.0 (20.6)	26 (15.0)	7 (3.9)	1,336 (786)
Branch	64 (33.0)	2,5 (1.3)	65 (33.2)	103 (53.1)	17 (8.8)	5,883 (3,005)
Bark	56 (12.1)	5.1 (1.6)	78 (18.7)	317 (43.6)	33 (7.7)	10,990 (1,154)
Wood	134 (8.1)	8.6 (1.1)	88 (4.9)	231 (5.6)	51 (9.7)	39,513 (3,371)

Fraction
Year	Leaf	Branch	Bark	Flower and fruits	Residue	Total
Year	Mg ha^-1
2000	3.22	1.17	2.09	0.43	0.13	7.04
2001	3.31	1.42	0.72	0.57	0.10	6.12

Leaf	N	P	K
Leaf	g kg^-1
canopy	21.30 (±1.06)	0.90 (±0.07)	11.66 (±0.98)	8.67 (±0.69)	2.33 (±0.25)
leaf fall litter	12.04 (±2.62)	0.43 (±0.08)	7.28 (±0.67)	8.10 (±0.82)	1.84 (±0.28)
forest floor	9.80 (± 1.96)	0.32 (±0.06)	2.51 (±0.43)	10.34 (±1.09)	1.60 (±0.20)
ll x cl ¹ 1 {([ll] - [cl]) / [cl]}x 100;	-43.5	-52.2	-37.5	-6.6	-8.5
lf x ll ² 2 {([lf] - [ll]) / [ll]}x 100.	-18.6	-25.5	-65.5	+27.6	-13.0

Year	Leaf	Total
	t ha^-1		N	P	K	Ca	Mg
	t ha^-1				kg ha ^-1
2000	5.88	12.01	103.0	3.49	21.4	111.0	18.0
2001	5.43	10.20	87.0	2.96	18.1	94.2	15.3

Fraction	N		P		K		Ca		Mg
	-------------------------------- kg ha^-1 ano^-1 -------------------------
	2000	2001	2000	2001	2000	2001	2000	2001	2000	2001
Leaf	38.8	41.8	1.4	1.4	23.5	24.1	26.1	26.8	5.9	6.1
Branch	14.5	17.5	0.2	0.2	3.7	4.5	11.8	14.3	1.4	1.7
Bark	8.4	2.9	0.8	0.3	3.7	1.1	27.7	9.0	4.2	2.0
Flower and Fruits	6.7	8.6	0.4	1.3	1.0	1.2	3.2	4.3	1.0	1.4
Residues	1.7	1.2	0.1	0.1	0.6	0.4	1.0	0.9	0.1	0.1

Year	K_L	K_E
Year	K_L	N	P	K	Ca	Mg
2000	0.55	0.67	0.85	1.59	0.43	0.63
2001	0.61	0.79	0.81	1.77	0.48	0.70

	N	P		Ca	Mg
	^{_________________________________} kg ha^{-1 _______ __________________________}
Tree	318 (77%) ¹ 1 Percentage in relation to the stock in vegetation plus litter;	19 (86%)	266 (93%)	677 (87%)	108 (86%)	57,772 (92%)
Stored in litter forest floor	95 (23%)	3 (14%)	20 (7%)	102 (13%)	17 (14%)	5,111 (8%)
Leaf fall litter	71 (22%) ² 2 Percentage of annual production in relation to stock in vegetation;	3 (16%)	32 (12%)	63 (9%)	12 (9%)	-
Soil (80 cm)	6,998(94%) ³ 3 Percentage in relation to the total nutrient stock in the system.	30 (55%)	491(61%)	1,087 (56%)	283 (67%)	95,020

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] Gláucio Mello CunhaDepartamento de Biologia, Universidade Federal do Espirito Santo – UFES, Alto Universitário, CEP 29500-000, Alegre, ES, Brasil e-mail: gláucio.cunha@ufes.br