Leaf dynamics and maintenance of tree crowns in a Malaysian rain forest stand

Citation
N. Osada et al., Leaf dynamics and maintenance of tree crowns in a Malaysian rain forest stand, J ECOLOGY, 89(5), 2001, pp. 774-782
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF ECOLOGY
ISSN journal
0022-0477 → ACNP
Volume
89
Issue
5
Year of publication
2001
Pages
774 - 782
Database
ISI
SICI code
0022-0477(200110)89:5<774:LDAMOT>2.0.ZU;2-Z
Abstract
1 Leaf demography was examined for trees of various heights over a 3.7-year period in a Malaysian rain forest. We compared demography between upper an d lower parts of the crown and its relation to height. The results were ana lysed at the stand level by pooling several trees of various shade-tolerant species, as well as three species for which multiple individuals were samp led. 2 Photon flux density was generally higher in the upper than in the lower c rowns. Leaf production rate and leaf loss rate were faster, and number of l eaf cohorts and median leaf life span were therefore lower, in the upper cr owns of most trees. Faster rates of leaf loss and shorter life spans were a ssociated with increasing height, although leaf production rate was unaffec ted. 3 Leaf life span and specific leaf area were plastic traits which decreased with height within several shade-tolerant tree species, indicating functio nal convergence. 4 Vertical distribution of leaf biomass was almost even in the stand. Becau se leaf life span was shorter in the upper canopy, these leaves contributed most to litter production. The vertical structure of the forest stand was therefore maintained through dynamic processes in trees of various heights over short time-scales.