EFFECT OF THINNING ON VOLUMES OF BIOMASS AND BARK TANNINS CONTENT OF <i>Mimosa caesalpiniifolia</i> BENTH. TREES

Paiva, Leoclécio Luís de; Azevedo, Tatiane Kelly Barbosa de; Pimenta, Alexandre Santos; Canto, Juliana Lorensi do; Souza, Maila Janaína Coêlho de; Ucella Filho, João Gilberto Meza

doi:10.1590/1806-908820230000028

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Scientific Article • Rev. Árvore 47 • 2023 • https://doi.org/10.1590/1806-908820230000028 copy

EFFECT OF THINNING ON VOLUMES OF BIOMASS AND BARK TANNINS CONTENT OF Mimosa caesalpiniifolia BENTH. TREES

EFEITO DO DESBASTE SOBRE OS VOLUMES DE BIOMASSA E O TEOR DE TANINOS CONDENSADOS DA CASCA DE Mimosa caesalpiniifolia BENTH.

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This research aimed to evaluate the effect of thinning on the wood volumes per hectare on the tannin content in the bark of Mimosa caesalpiniifolia. The planting was subdivided into two plots, one thinned at 12 and 55 months of age (T1), while the other plot was kept intact (T2). The dendrometric variables were measured, and ten trees were felled, five in each plot. Subsequently, wood and bark’s volume, mass, and moisture content were determined. Then, the total solids content (TST), the Stiasny index (I), and the condensed tannin content (TTC) were quantified. Dry wood productivity was statistically different between the two treatments, with values of 26.7 and 22.8 t ha^-1 for T1 and T2, respectively. The percentage of dry bark corresponded to 16% of the total biomass for both treatments. The only variable that showed a significant difference was I, with values with and without thinning, 59.83 and 79.31%, respectively. Therefore, it was verified that the way the thinning was used changed the I and how they were conducted, favoring the emission of boles and increasing the frequency in the lower diametric classes instead of favoring the increase in DBH. It is concluded that thinning interferes with the biomass volumes and the Stiasny index of M. caesalpiniifolia. However, it does not alter the concentration of tannins present in the species’ bark.

Keywords:
Secondary metabolites; Dry forests; Silvicultural practices

Table 1 Distribution of trunks per diametric class for M. caesalpiniifolia subjected to two types of management.

DBH class (cm)	With thinning		Without thinning
DBH class (cm)	Trunks ha^-1	%	Trunks ha^-1	%
<2	1,666.7	16.4	1,966.7	16.6
2-3	3,433.3	33.9	3,700.0	31.3
3-4	2,266.7	22.4	2,400,0	20.3
4-5	1,933.3	19.1	2,033.3	17.2
5-6	366.7	3.6	900.0	7.6
6-7	400.0	3.9	466.7	3.9
7-8	0.0	0.0	200.0	1.7
8-9	33.3	0.3	133.3	1.1
9-10	0.0	0.0	33.3	0.3
>10	33.3	0.3	0.0	0.0
Total	10,133.0	100.0	11,833.0	100.0

Table 2 Tree volume with (Vcc) and without bark (Vsc), form factor, cubed volume with (Vcc) and without bark (Vsc), bark volume (Vc), and bark percentage of M. caesalpiniifolia subjected to two types of management.

Experimental Plot	Tree Volume		Formfactor	Cubed Volume			Bark %
Experimental Plot	V_cc(m³ ha^-1)	V_sc(m³ ha^-1)	Formfactor	V_ccc (m³) ha^-1)	V_csc(m³ ha^-1)	V_c (m³ ha)	Bark %
With thinning	62.6 b	49.8 a	0.58 ± 0,28	36.3 b	28.9 a	7.4 a	20.4 a
Without thinning	84.9 a	67.7 a	0.50 ± 0,08	42.5 a	34.0 a	8.5 a	20.1 a

Table 3 Mean values of green wood mass, moisture content of green wood, dry wood mass, green bark mass, moisture content of green bark, and dry bark mass for M. caesalpiniifolia subjected to two types of management.

Experimental Plot	Green Wood (t ha^-1)	TU%	Dry Wood (t ha^-1)	Total(%)	Green Bark (t ha^-1)	TU (%)	Dry bark (t ha^-1)	Total (%)
With Thinning	38.4	40.4	22.8	83.8	18.8	76.6	4.4	16.2
Without Thinning	44.8	40.4	26.7	83.8	22.1	76.6	5.2	16.3

Sociedade de Investigações Florestais Universidade Federal de Viçosa, CEP: 36570-900 - Viçosa - Minas Gerais - Brazil, Tel: (55 31) 3612-3959 - Viçosa - MG - Brazil
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