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Growth and Harvesting of Common Rattans in Bangladesh

N. A. Siddiqi,
Divisional Officer
Bangladesh Forest Research Institute

Rowshon Ara
Senior Research Officer
Bangladesh Forest Research Institute

S. R. Merry
Research Officer
Bangladesh Forest Research Institute

Abstract/ Executive Summary:

This paper presents information about growth, harvesting ages and yields for Jali-bet (Calamus tenuis), kerak-bet (C. viminalis) and golla-bet (Daemonorops jenkinsiana) raised in semi-evergreen/ deciduous forests of Bangladesh. Clump expansion with increasing age was highest for C. tenuis and C. viminalis in Chittagong and for D. jenkinsiana in Sylhet. Mean annual height increments of main shoot of a clump of C. tenuis, C. viminalis and D. jenkinsiana were 0.94+ 0.08, 1.11+ 0.09 and 1.45+ 0.11 m respectively. Highest number of shoots per clump was noticed for C. tenuis in Sylhet followed by C. viminalis and D. jenkinsiana in Chittagong. Mean diameters of the main shoot of these species were 1.6+0.1, 2.14+0.1 and 3.01+ 0.13 cm respectively. Wildings were found under the clumps with varying numbers. The exploitable ages for C. tenuis, C. viminalis and D. jenkinsiana appeared to be 6-8, 9-11 and 10-12 years respectively. Further information and studies are needed to determine the harvesting cycle and suggest a management plan for rattans.

Keywords: Calamus tenuis, C. viminalis, Clump expansion, Daemonorops jenkinsiana, Exploitable age, Rattan

Location: Sylhet, Chittagong, Tangail and Dhaka.

Start Date: 00-07-1997

End Date: 00-06-2000

Program Area: Conservation and Biodiversity

Commodity: Cane

Objectives:

a) To determine the growth performance and harvesting schedule of common rattan species of Bangladesh

Methodology:

In order determine the growth performance and harvesting schedule, data were collected from Dhaka, Chittagong, Tangail and Sylhet forest Division during the period from 1997-2000. Data were collected on width of clump, shoot number, height and diameter of main shoot for each clump. The diameter of main shoot was measured by slide caliper, height with bamboo gauze and the area occupying the clump by measuring tape. The clumps for measurement were selected randomly. Usually 10% of the clump was measured in a locality. However, in an area with poor survival and less number of clumps 100% enumeration was made. Collected data from different localities were summarized to assess the increment rate, harvesting age and yield for C. tenuis, C. viminalis and D. jenkinsiana. Probable yearly exploitable stems from a clump have been determined from visual observations, experience and discussion with the local people. The maturity of stems was ascertained from brownish color of leaves and separation of leaf sheath from the stem.

Source of Information: Bangladesh Journal of Forest Science Vol. 29 (2): 97-105, 2000

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Calamus tenuis, C. viminalis and Daemonorops jenkinsiana have marked promising performance for their inclusion as non-timber plantation species under the canopy of deciduous and semi-evergreen forests. Although survival and growth of these species are satisfactory, adequate information is not yet available on appropriate harvesting age and cycle. On good locations C. tenuis can be harvested from the age of 6-8 years, C. viminalis from 9-11 years and D. jenkinsiana from 10-12 years. However, more information is needed to suggest a management plan of different rattan species.

Knowledge Management: Journal