<i>Eucalyptus</i> Leaf Area Index Estimated by Vegetation Indices Using Landsat-5 TM Images

Almeida, André Quintão de; Ribeiro, Aristides; Delgado, Rafael Coll; Rody, Yhasmin Paiva; Oliveira, Aline Santana de; Leite, Fernando Palha

doi:10.1590/2179-8087.103414

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Artigos Originais • Floresta Ambient. 22 (3) • Jul-Sep 2015 • https://doi.org/10.1590/2179-8087.103414 copy

Eucalyptus Leaf Area Index Estimated by Vegetation Indices Using Landsat-5 TM Images

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of the present study was to fit regression models to the measured leaf area in eucalyptus forests and vegetation indices derived from Landsat-5 TM images. The study was carried out in commercial plantations located in the basin of the Doce River, Minas Gerais state, between 2008 and 2011. Leaf area was measured in the field, non-destructively, with the LAI-2000 device. The following indices were used: Normalized Difference Vegetation Index (NDVI), Soil Adjusted Vegetation Index (SAVI), and Simple Ratio (SR). The best model was adjusted from the NDVI, with a correlation coefficient of 0.73 and root mean square error of 0.37 m² m^–2 (19%). We conclude that the leaf area index can be estimated by the regression models fit to the vegetation indices derived from the Landsat - 5 TM images.

Keywords:
remote sensing; statistics; planted forest

Data IAF	Data imagem	Elevação (°)	Azimute do sol (°)
20/8/2008	5/9/2008	49,0	54,5
4/11/2009	27/11/2009	63,2	99,8
16/12/2009	13/12/2009	61,6	104,1
10/5/2010	6/5/2010	43,6	42,5
16/8/2010	26/8/2010	46,8	49,9
10/3/2011	25/5/2011	40,0	39,0

Idade plantio (anos)	IAF (m² m^–²)	NDVI	SAVI	SR
0,5	0,48	0,33	0,20	2,00
1	2,17	0,78	0,50	7,74
1,3	2,43	0,66	0,41	4,80
1,4	2,51	0,76	0,66	7,71
2	3,14	0,79	0,51	8,20
4	2,09	0,71	0,42	5,82
4	1,99	0,75	0,51	7,11
4	2,35	0,75	0,50	7,09
4	2,63	0,73	0,50	6,45
4	2,38	0,76	0,50	7,56
4	2,45	0,74	0,47	6,95
4	2,25	0,70	0,46	5,61
4	2,02	0,76	0,51	7,32
4	2,14	0,76	0,50	7,22
5	1,83	0,72	0,42	6,29
5	2,37	0,71	0,41	5,97
5	1,76	0,58	0,32	3,85
5	1,44	0,72	0,42	6,26
5	2,33	0,66	0,36	4,86
6	2,34	0,72	0,47	6,13
6	2,90	0,75	0,46	6,85
7	2,85	0,74	0,46	6,70
7	2,52	0,75	0,46	7,10
7	1,61	0,72	0,32	6,05
7	1,06	0,53	0,29	3,22
7	1,88	0,71	0,36	5,95

Modelo (Log IAF)	r²	EQMR (m² m^–2)	CBI	Valor p
3,6 (NDVI) - 1,9	0,73	0,37 (19%)	-30	< 0,01
3,93 (SAVI) - 1,02	0,68	0,42 (22%)	-25	< 0,01
0,23 (SR) - 0,73	0,62	0,40 (21%)	-20	< 0,01
3,06 (NDVI) + 0,72 (SAVI) -1,8	0,73	0,37 (19%)	-27	< 0,01

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] *André Quintão de AlmeidaDepartamento de Engenharia Agrícola – DEAGRI, Universidade Federal de Sergipe - UFS, São Cristóvão, SE, Brasil e-mail: andreqa@gmail.com