Sobrevivência e crescimento inicial de plântulas de Euterpe edulis Mart. transplantadas para clareiras e sub-bosque em uma Floresta Estacional Semidecidual, em Viçosa, MG
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Abstract
Este estudo teve como objetivos avaliar a sobrevivência e crescimento inicial de plântulas de Euterpe edulis Mart. transplantadas para duas condições de luz: clareira e sub-bosque, além de discutir seu comportamento ecofisiológico. Foram transplantadas 90 plântulas com altura entre 5 e 25 cm em seis parcelas: três em sub-bosque e três em clareiras, no espaçamento 2 x 2 m em três linhas de plantio, com cinco plântulas cada. A porcentagem de sobrevivência (geral) no período do estudo foi de 36,7%, enquanto nas clareiras foi de 53,3% e no sub-bosque, 20%. Uma regressão não linear mostrou relação positiva entre abertura de dossel e sobrevivência de plântulas de E. edulis. A maior taxa de sobrevivência das plântulas no ambiente de clareira em relação ao sub-bosque pode ser explicada pelo excesso de sombreamento no último, causada pela baixa porcentagem de abertura do dossel (4,78%). A abertura do dossel não influenciou significativamente no crescimento das plântulas.
The objective of this study was to evaluate the survival and initial growth of Euterpe edulis seedlings transplanted to two light conditions: gaps (clearing area) and understory. Moreover it discusses their ecophysiologycal behavior on these two micro-sites. Ninety seedlings of Euterpe edulis with height about 5 and 25 cm were transplanted in six plots: three on understory and three 3 on gaps (clearing area) in a 2x2m spacing with three rows of plants containing five plants each one. The survival percentage during the period of the study was 36.7% whereas on gaps (clearing area) it was 53.3% and on understory it was 20%. A non-linear regression showed a positive relationship between canopy openness and seedling of E. edulis. The higher survival rate of seedlings on gaps (clearing area) than on understory can be explained by the excess of shade on the latter, caused by the low canopy openness percentage (4.78% on average). There was no influence of canopy openness on seedling height growth.
The objective of this study was to evaluate the survival and initial growth of Euterpe edulis seedlings transplanted to two light conditions: gaps (clearing area) and understory. Moreover it discusses their ecophysiologycal behavior on these two micro-sites. Ninety seedlings of Euterpe edulis with height about 5 and 25 cm were transplanted in six plots: three on understory and three 3 on gaps (clearing area) in a 2x2m spacing with three rows of plants containing five plants each one. The survival percentage during the period of the study was 36.7% whereas on gaps (clearing area) it was 53.3% and on understory it was 20%. A non-linear regression showed a positive relationship between canopy openness and seedling of E. edulis. The higher survival rate of seedlings on gaps (clearing area) than on understory can be explained by the excess of shade on the latter, caused by the low canopy openness percentage (4.78% on average). There was no influence of canopy openness on seedling height growth.