Studies on Tree Rings, Growth Rates and Age-Size Relationships of Tropical Tree Species in Misiones, Argentina

1989

S. 161-169

2 Abb., 1 Tab., 21 Lit. Ang.

Unselbständiges Werk

200040224

Wood samples of 13 tree species from three sites in the selva Misionera (Misiones Province, Argentina) were analysed macro- and microscopically for occurrence and formation of growth rings. Well-defined annual tree rings were found in Cedrela fissilis Vell., Parapiptadenia rigida Benth., Cordia trichotoma Vell. and Chorisia speciosa St. Hil. In 15 trees of Cedrela fissilis Vell., the growth rate, the current and the mean annual increment (CAI and MAI) and the diameter/age relationship were estimated using increment borer samples. The estimated mean culmination age of the basal MIA was 152 years, while the same paremeter measured on individual trees shows a wide range from 61 to 180 years, probably representing different social positions of the trees. The method proposed is discussed as a way to obtain a quick, reliable, and inexpensive estimation of parameters which are useful in forest management.