Leaf senescence in kapur (Dryobalanops aromatica Dipterocarpaceae) under different canopy conditions

F. S. P. Ng, . Leaf senescence in kapur (Dryobalanops aromatica Dipterocarpaceae) under different canopy conditions. pp. 275-280. ISSN 0128-1283

Seedlings of kapur were grown under three different canopy conditions and found to have very different leaf spans. Leaves lasted eight to nine months in the open (100 Relative Light Intensity) 10 to 15 months under moderate canopy (38 RLI) and 25 to 34 months under dense canopy (4 RLI). The rate of leaf production was about 1.5 leaves per month at 38 and 100 RLI but only 0.5 leaves per month at 4 RLI. From 4 to 38 RLI the shortening of leaf life span was more than compensated by increase in leaf production so that plants at 38 RLI carried more leaves than those at 4 RLI. But above 38 RLI there was no additional increase in leaf production to compensate for the continued shortening of leaf life span with the result that plants at 100 RLI experienced a high turnover of leaves but carried fewer leaves than those at 38 and 4. This provides the physiological explanation for the observation that kapur grows best under moderate canopy conditions.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v4n4/275...

Abstract

Seedlings of kapur were grown under three different canopy conditions and found to have very different leaf spans. Leaves lasted eight to nine months in the open (100 Relative Light Intensity) 10 to 15 months under moderate canopy (38 RLI) and 25 to 34 months under dense canopy (4 RLI). The rate of leaf production was about 1.5 leaves per month at 38 and 100 RLI but only 0.5 leaves per month at 4 RLI. From 4 to 38 RLI the shortening of leaf life span was more than compensated by increase in leaf production so that plants at 38 RLI carried more leaves than those at 4 RLI. But above 38 RLI there was no additional increase in leaf production to compensate for the continued shortening of leaf life span with the result that plants at 100 RLI experienced a high turnover of leaves but carried fewer leaves than those at 38 and 4. This provides the physiological explanation for the observation that kapur grows best under moderate canopy conditions.

[error in script]

Item Type:	Article
AGROVOC Term:	Dryobalanops
AGROVOC Term:	Dipterocarpaceae
AGROVOC Term:	Canopy
AGROVOC Term:	Germination
AGROVOC Term:	Seedlings
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/22650

Actions (login required)

View Item