ALLOMETRIC MODELS FOR ESTIMATING ABOVEGROUND BIOMASS AND BIOMASS ALLOCATION OF CAPIXINGUI TREES (<i>Croton floribundus</i> Spreng.) IN AN AGRISILVICULTURAL SYSTEM

Nicodemo, Maria Luiza Franceschi; Muller, Marcelo Dias; Carpanezzi, Antônio Aparecido; Porfírio-da-Silva, Vanderley

doi:10.1590/0100-67622016000200010

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Articles • Rev. Árvore 40 (2) • Mar-Apr 2016 • https://doi.org/10.1590/0100-67622016000200010 copy

ALLOMETRIC MODELS FOR ESTIMATING ABOVEGROUND BIOMASS AND BIOMASS ALLOCATION OF CAPIXINGUI TREES (Croton floribundus Spreng.) IN AN AGRISILVICULTURAL SYSTEM

MODELOS ALOMÉTRICOS PARA ESTIMAÇÃO DE BIOMASSA AÉREA E ALOCAÇÃO DE BIOMASSA DE CAPIXINGUI (Croton floribundus Spreng.) EM UM SISTEMA SILVIAGRÍCOLA

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this study was to select allometric models to estimate total and pooled aboveground biomass of 4.5-year-old capixingui trees established in an agrisilvicultural system. Aboveground biomass distribution of capixingui was also evaluated. Single- (diameter at breast height [DBH] or crown diameter or stem diameter as the independent variable) and double-entry (DBH or crown diameter or stem diameter and total height as independent variables) models were studied. The estimated total biomass was 17.3 t.ha-1, corresponding to 86.6 kg per tree. All models showed a good fit to the data (R²_ad > 0.85) for bole, branches, and total biomass. DBH-based models presented the best residual distribution. Model lnW = b0 + b1* lnDBH can be recommended for aboveground biomass estimation. Lower coefficients were obtained for leaves (R²_ad > 82%). Biomass distribution followed the order: bole>branches>leaves. Bole biomass percentage decreased with increasing DBH of the trees, whereas branch biomass increased.

Keywords:
Agroforestry systems; Integrated production systems; Modeling

Table 1 Statistical parameters of the allometric models used for estimating biomass of 4.5-year-old capixingui established in an agrisilvicultural system as a function of diameter at breast height (DBH, cm), stem diameter (Ds, cm), crown diameter (Dc, cm), and total height (H, m)

Equation	Coefficients			R²_ad	S_xy
Equation	β₀	β₁	β₂	R²_ad	S_xy
Predictor variables: DBH and H
1	-2.7218	2.6172	-0.2518	0.9850	0.2098
2	-2.7652	2.3953	0.0076	0.9850	0.2099
3	-3.3561	0.9666		0.9801	0.2187
4	-2.8564	2.4771		0.9834	0.1999
Predictor variables: Ds and H
1	-4.8627	1.2419	2.5268	0.9587	0.3484
2	-6.7739	4.4830	-0.1142	0.9507	0.3805
3	-4.6437	1.0933		0.9423	0.3724
4	-4.3460	2.8617		0.9168	0.4473
Predictor variables: Dc and H
1	-2.6662	1.6199	2.0887	0.9800	0.2427
2	-0.3648	4.5547	-0.4781	0.9710	0.2921
3	-1.5995	1.1298		0.9706	0.2658
4	-0.2697	2.9606		0.9436	0.3685

Table 2 Statistical parameters of the allometric models used for estimating biomass of tree components of 4.5-year-old capixingui established in an agrisilvicultural system

Equation	Coefficients			R²ad	Sxy
Equation	β₀	β₁	β₂	R²ad	Sxy
Bole
1	-15.0651	0.6805	2.4295	98.79	0.1732
2	- 2.7771	2.2878	-0.0394	95.96	0.3162
3	- 5.5287	0.6790		95.85	0.3041
4	- 1.7473	1.5941		93.16	0.3906
Branches
1	-20.1640	0.7204	3.1347	92.48	0.5340
2	- 4.4605	2.8962	-0.0566	90.15	0.6115
3	- 7.4997	0.8100		88.01	0.6101
4	- 2.9805	1.8992		85.00	0.6825
Leaves
1	-16.9614	0.7911	2.3654	85.87	0.6664
2	- 4.8686	2.2690	-0.0334	83.25	0.7255
3	- 7.9701	0.7149		82.19	0.6767
4	- 3.9952	1.6806		81.66	0.7202

Sociedade de Investigações Florestais Universidade Federal de Viçosa, CEP: 36570-900 - Viçosa - Minas Gerais - Brazil, Tel: (55 31) 3612-3959 - Viçosa - MG - Brazil
E-mail: rarvore@sif.org.br

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