RESUMO -Variáveis físicas do solo foram investigadas em parcelas de floresta de terra firme submetidas à extração seletiva de madeira na Amazônia central. Foram obtidas curvas de retenção de água no solo, juntamente com medidas de água disponível no solo às plantas, densidade do solo e porosidade total. Medidas de temperatura do solo foram realizadas por mais de 13 meses, considerando seis tratamentos: controle, centro da clareira, borda da clareira, borda da floresta remanescente, floresta remanescente e trilha do trator. Medidas de condutividade hidráulica de solo saturado foram feitas na floresta e em clareiras, sem distinguir os tratamentos. O solo revelou baixa capacidade de armazenar água disponível: apenas 11 a 18% da água pode estar disponível às plantas, num perfil de 1 m de profundidade. A temperatura das camadas superiores do solo foi influenciada pela extração seletiva de madeira: nas clareiras abertas, a luz chega com mais intensidade no solo, proporcionando temperaturas mais elevadas no centro e nas bordas das clareiras do que no controle e na floresta remanescente.Palavras-chave: Curva de retenção de água, temperatura do solo, condutividade hidráulica do solo, física do solo, extração seletiva de madeira. Soil Physical Properties after Selective Logging in Central Amazônia.ABSTRACT -Soil physical variables were investigated in forest plots submitted to selective logging in Central Amazonia. After logging, soil samples were collected to obtain soil water Temperature measurements were carried out for 13 months, considering six treatments: control, center of the gaps, edge of the gaps, edge of the remaining forest, remaining forest and tractor tracks. Hydraulic conductivity measurements on saturated soil were conducted both on the available water storage capacity: only 11 to 18% can be available to the plants, up to 1 meter depth. The temperature of the soil upper layers was influenced by logging, i. e., through the opening of the gaps, light reaches the soil more intensely in the center and edge of gaps,
SUMMARYSoil water storage of Central Amazonian soil profiles in upland forest plots subjected to selective logging (in average, 8 trees or 34, 3 m 3 of timber per hectare were removed) was measured in four layers, down to a depth of 70 cm. The study lasted 27-months and was divided in two phases: measurements were carried out nearly every week during the first 15 months; in the following year, five intensive periods of measurements were performed. Five damage levels were compared: (a) control (undisturbed forest plot); (b) centre of the clearing/ gap; (c) edge of the gap; (d) edge of the remaining forest; and (e) remaining forest. The lowest values for water storage were found in the control (296 ± 19.1 mm), while the highest were observed (333 ± 25.8 mm) in the centre of the gap, during the dry period. In the older gaps (7.5-8.5 year old), soil water storage was similar to the remaining and the control forest, indicating a recovery of hydric soil properties to nearly the levels prior to selective logging. Index terms: selective logging, soil water storage, upland rain forest, Central Amazonia.( (333 ± 25,8 mm), no período seco. Nas clareiras mais antigas (7,(5)(6)(7)(8)5
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