Seedling growth dynamics of a deeply rooting liana in a secondary forest in eastern Amazonia

8 de março de 2004

mar 8, 2004

Teresa G. Restom, Daniel C. Nepstad

Root penetration rate was estimated for the liana Davilla kunthii St. Hill (Dilleniaceae) in a secondary forest in eastern Amazonia by relating aboveground growth with root depth measurements. Basal diameter, height, number of leaves and number of scars of approximately 100 individuals were monitored between 1991 and 1996. These measurements were used to estimate the age of 28 seedlings (up to 137 cm of height) that were excavated for root depth measurements, and a model was derived for estimating root penetration rate for D. kunthii at this site. The deepest individual excavated had roots as deep as 10 m and had a mean estimated age of 15 years. Root penetration rate was higher below 3 m depth than in more superficial soil, perhaps due to a decrease in soil resistance with depth. Some individuals made use of less resistant soil, such as leaf-cutter ants’ nests or the channels of dead roots, to increase their root depth. Pre-dawn leaf water potential, measured in 28 other individuals, was uniformly high in plants with a diameter greater than 12 mm, but highly variable in plants with a smaller diameter, indicating lower water deficit in more deeply rooting plants. Deep rooting was shown to be a priority in the development of D. kunthii and may contribute to its success in establishing in regenerating seasonal forests. Soil heterogeneity plays an important role in allowing for deeper root penetration, which may result in a reduction in the water deficit during the dry season.

Full article.

Baixar (sujeito à disponibilidade)

Download (subject to availability)

Veja também

See also

Leafcutter Ant Nests Inhibit Low-Intensity Fire Spread in the Understory of Transitional Forests at the Amazon's Forest-Savanna Boundary

Leafcutter Ant Nests Inhibit Low-Intensity Fire Spread in the Understory of Transitional Forests at the Amazon's Forest-Savanna Boundary

Leaf-cutter ants (Atta spp.) remove leaf litter and woody debris—potential fuels—in and around their nests and foraging trails. We conducted single and three annual experimental fires to determine the effects of this leaf-cutter ant activity on the behavior of...

Boletim "Tanguro em Pauta" – 2

Boletim "Tanguro em Pauta" – 2

O Projeto Tanguro realiza pesquisas de queima controlada na Fazenda Tanguro desde 2004 e tem como objetivo entender os impactos do fogo na degradação de florestas tropicais. Confira a segunda edição do “Tanguro em Pauta” e saiba mais sobre o maior e mais longo experimento com fogo controlado em florestas tropicais.