Data/hora: 19/06/2024 01:12:07

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 11/09/2008
Data da última atualização: | 11/09/2008
Autoria: | KAHLE, H. P.; GÜNTHER, J.; SPIECKER, H.; MARQUES, R.; BRÜSKE, J.
Título: | Continuous monitoring of tree radial growth and stem hydrology with electronic point dendrometers - An example from the Atlantic Rain Forest, Paraná, Brazil
Ano de publicação: | 2008
Fonte/Imprenta: | In: SEMINÁRIO NACIONAL SOBRE DINÂMICAS DE FLORESTAS, 1., 2008, Curitiba. Anais. Colombo: Embrapa Florestas, 2008.
Descrição Física: | 1 CD-ROM.
ISBN: | 978-85-89281-22-5
Idioma: | Inglês
Notas: | Resumo 64.

Conteúdo:

Monitoring of forest ecosystems is a means to assess the state of the ecosystems by providing information on its present conditions. Information from long-term monitoring is needed to judge whether a given state is close to or far from a reference state. In systems with long developmental cycles trends only become visible when looking on long-term dynamics. Conditions of forest ecosystems refer to different spatial and temporal scales as well as different hierarchical levels. Dendrometer data provide information on the short-term and seasonal dynamics of tree radial growth as well as on stem hydrology. Combining dendrometer data with data on environmental conditions, e.g. meteorological and soil conditions, gives insight into ecophysiological processes and biogeochemical cycles in the forest ecosystems. We show data and descriptive analysis results from the ecological field measurement station at Reserva Natural do Cachoeira, Antonina,
Paraná, which demonstrate the substantial contribution dendrometer measurements can provide to the monitoring of forest ecosystems. Data for the period October 2006 and December 2007 are presented. Sample trees of four tree species were equipped with electronic point dendrometers: Pera glabrata (PG); Vochysia bifalcata (VB); Tapiria guianensis (TG), Andira anthelmintica (AA). In addition air temperature (TP), relative air humidity (RF) and soil moisture tension at 30 cm (Tens30) and 60 cm (Tens60) soil depth were measured inside the forest. The measurement interval was 5 minutes. The average daily stem radial increment (1/100 mm*day-1) was 0.26 for PG, 1.03 for VB, 0.27 for TG, and 0.06 for AA. Stem radial growth mainly took place on cloudy days, whereas on sunny days average daily stem radial increment was either negative or small as compared to that on cloudy days. The daily cycle in stem radial changes is affected by stem hydrological changes and consists of a contraction and expansion phase. The average daily
amplitude in stem radial dimension (1/100 mm*day-1) was 4.14 for PG, 4.26 for VB, 7.04 for TG, and 3.42 for AA. Cross-correlation analysis reveals for all species a close relation between daily changes in tree radial displacement and the daily courses of RF, TP, Tens30 and Tens60. The response times of the tree stems? reactions, i.e. the lead and lag-times, differ among species, indicating species specific environmental controls of physiological processes.

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43539-1) - UPE - PL - -- - CD0311 -  -  - DIS