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Performance of Mangrove Species Planted Inside Sonneratia Apetala Buch-ham, Plantatios in the Coastal Belt of Bangladesh.

Sk. Ahiul Islam
Divisional Officer
Plantation Trial Unit Division, Bangladesh Forest Research Institute, Rupatali, Barisal

Md. Ahsan habib
Field Investigator
Plantation Trial Unit Division, Bangladesh Forest Research Institute, Rupatali, Barisal

Md. Abdul Quddus Miah
Field Investigator
Plantation Trial Unit Division, Bangladesh Forest Research Institute, Rupatali, Barisal

Abstract/ Executive Summary:

An elimintation trial with eleven mangrove species was conducted inside Sonneratia apetala Buch.-ham. plantation at Rangabali island of Patuakhali district and char Kukri_mukri island of Bhola district, Bangladesh to observe the site -suitability and growth performance of the species. The data on survival, height and diameter growth were recorded from 21 years old matured experimental stands. Some mangrove species showed promisinggrowth performance in the coastal belt. The highest survival was found in Aegiceras corniculatum followed by Phoenix paludosa, Excoecaria agaloccha , Heritiera fomes and Xylocarpus mekongensis at Rangabali island. In the Char Kukr-Mukri island, the highest survival was recorded for E. agallocha followed by P. paludosa, A. corniculatum, H. fomes and X.mekongensis. Considering the height and diameter growth, the most promising species was E.agallocha and then X.mekongensis, A. corniculatum, H. fomes and P. paludosa in both the islands. Therefore, these mangrove species can be planted S. apetala plantations for sustainability of coastal forest in Bangladesh.

Keywords: Coast line, Mangrove plantation, Underplanting, Survival and growth

Location: Rangabali under Patuakhali and Char kukri-mukri under Bhola Districts.

Start Date:

End Date:

Program Area: Conservation and Biodiversity

Commodity: Tree

Objectives:

Coastal afforestation mainly with keora tree. After harvesting of matured S. apetala trees, there will be no second rotation forest for sustainability of coastal forest. Therefore, under planting trial in the existing S. apetala plantations with different mangrove species were laid out since 1990. The objective of this study was to find out suitable species for coastal plantation under the canopy of S.apetala forests for the establishment of long term permanent forest cover.This paper describes sustainability ( i.e. long term mangrove forest for climate mitigation and green shelter belt) and growth performance of 21 years old under planted mangrove species inside S. apetala plantations in Rangabali island of Patuakhali district and Char Kukri-Mukri island of Bhola district, Bangladesh.

Methodology:

Bangladesh Forest Research Institute carried out an elimination trial ( i.e. choice of suitable species on the basis of their fast growth rates) along the coastline in two offshore islands, Rangabali under Patuakhali district and Char Kukri-Mukri under Bhola district, Bangladesh. The commercially important 11 mangrove species namely Heritiera fomes (sundri), Excoecaria agaloccha (gewa), Xylocarpus mekongensis (passur), Xylocarpus granatum (dhundul), Bruguiera sexangulla (kankra), Aegiceras corniculatum (khalshi), Cynometra ramiflora (shingra), Ceriops decandra (goran), Lumnitzera racemosa (kipra), Phoenix paludosa (hantal) and Nypa fruticans (golpata) were included in the underplanting trial. in this study, underplanting means, some of the species were planted under the canopy of an established plantation. Among these planted species, 5 are tree, 4 are shurb and 2 are palm species. The seeds or propagules of these mangrove species were collected from the Sundarban. Seedlings of all mangrove species except N. fruticans were raised in polybags of size 25 cm x 15 cm or 15 cm x 10 cm. Only N. fruticans seedlings were raised in muddy soil along the canal side or in the marshy land. Seedlings in the nursery were maintained in the nursery for about 10 months.The plots were laid out in several sites such as Char Kashem under Rangabali island; and Char Zamir, Char Shafi and Zylar khal under Char Kukri-Mukri island. The experiment was laid out in Randomized Complete Block Design with three replications. Each plot was planted with 100-121 seedlings at a spacing of 1.2m x 1.2m. The plot were fenced to prevent grazing animal interference up to five years of the plantations. Ten month old seedlings of the species were planted under under 9-12 years old S. apetala plantations, except for N. fruticaans seedlings, which were planted when three month old. Regular weeding was made up to five years after planting. The data in relation to survival, height and diameter growth were collected from the experimental plantations when the stand was 21 years. recorded data were computed and analyzed using Excel and Minitab statistical packages.

Source of Information: Journal Of Bio science & Agriculture Research.Vol.03(01) : 38-44

Article Link (Online Journal):

Funding Source:

1. World Bank

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Bangladesh is a pioneer country in raising successful plantation with S. apetala along the shoreline and offshore islands. But these plantations are under tremendous pressure due to geo morphological changes in the plantation sites and human interference. After harvesting this pioneer species, there will be no forests in absence of natural regeneration. Therefore, before harvesting a second rotation forest should be created. The promising species like E. agallocha, A. corniculatum, H. fomes, X. mekongensis and P. paludosa can be recommended for afforestation under the canopy of S. apetala plantation for sustainability of coastal forests. This coastal forest could be a green shelterbelt against all extreme weather events due to climate change in Bangladesh.

Knowledge Management: Journal