EVALUATION OF GROWTH STRESS IN <i>Eucalyptus</i> CLONES

Trugilho, Paulo Fernando; Lima, José Tarcísio; Rosado, Sebastião Carlos da Silva; Mendes, Lourival Marin; Mori, Fábio Akira; Souza, Marcos Aurélio Mathias de

Artigo Original • Floresta Ambient. 9 (1) • Jan-Dec 2002 •

EVALUATION OF GROWTH STRESS IN Eucalyptus CLONES

Authorship SCIMAGO INSTITUTIONS RANKINGS

The objectives this research were: a) to evaluate the magnitude of the strain of longitudinal traction in trees of eleven clones of Eucalyptus; b) to verify the existent variability between clones and; c) to verify the variation in two longitudinal positions (1.3 and to 3 m of height). The results showed that the clone effect was highly significant, while the effects of longitudinal position and the interaction (clone x longitudinal position) was not significant. The average tension was of 288 kgf/cm², varying from 279 and 296 kgf/cm² to 1.30 and 3 meters of height, respectively. The variation of the strain among the clones was from 139 to 448 kgf/cm².

Key words
Growth stress; Eucalyptus, clones

Tabela 1 Valores médios da deformação residual longitudinal (DRL), módulo de elasticidade (MOE) e estimativa da tensão de crescimento longitudinal (TCL).

Clone	DRL (mm)			MOE (kgf/cm²)			TCL (kgf/cm²)
Clone	P₁	P₂	Média	P₁	P₂	Média	P₁	P₂	Média
1	0,069	0,078	0,073	145606	135629	140618	224	234	229
2	0,053	0,064	0,059	95621	114865	105243	112	165	139
3	0,120	0,121	0,120	161005	148371	154688	433	402	417
4	0,112	0,105	0,109	140443	123492	131968	354	290	309
5	0,082	0,079	0,080	155176	168830	162003	283	296	290
6	0,063	0,074	0,069	127502	140338	133920	180	225	203
7	0,070	0,076	0,073	111564	138313	124939	173	234	204
8	0,086	0,088	0,087	145735	144454	145095	280	282	281
9	0,087	0,096	0,096	157936	169253	163595	307	390	349
10	0,146	0,144	0,145	133121	145623	139372	431	464	448
11	0,077	0,078	0,078	171595	168140	169868	292	303	298
Média	0,088	0,092	0,090	140482	145210	142846	279	299	288

Tabela 2 Resumo da análise de variância para o delineamento experimental adotado para a DRL e TCL.

		DRL (mm)		TCL (kgf/cm²)
FV	GL.	QM	Significância	QM	Significância
Clone (C)	10	0,003903	0,0001	51985,369697	0,0001
Erro a	22	0,000160		5014,606061
Posição (P)	1	0,000301	0,1553	4940,015152	0,2188
P x C	10	0,000082	0,8071	3393,915152	0,4035
Erro b	22	0,000139		3082,787879
Total	65

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