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HUMAN-INDUCED SUCCESSION OF VEGETATION ON NEW ACCRETIONS IN THE COASTAL AREAS OF BANGLADESH

N. A. Siddiqi and M. A. S. Khan
Journal of Tropical Forest Science
Vol. 16, No. 2 (April 2004), pp. 187-198
Stable URL: http://www.jstor.org/stable/23616512
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
HUMAN-INDUCED SUCCESSION OF VEGETATION ON NEW ACCRETIONS IN THE COASTAL AREAS OF BANGLADESH
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Abstract

Coastal afforestation in Bangladesh was initiated in 1996 with pioneer species Sonneratia apetala and Avicennia officinalis. Tree species, Excoecaria agallocha, Heritiera fomes and Xylocarpus mekongensis; shrub species, Cynometra ramiflora and Lumnitzera racemosa; and palm species, Phoenix paludosa and Nypa fruticans were suitable for second rotation crops. A survival of 90.3% for E. agallocha, 84.7% for H. fomes and 58.3% for X. mekongensis was recorded. Mean annual height increments of these species were 1.03, 0.59 and 0.14 m and diameter increments 0.92, 0.39 and 0.15 cm respectively. Survivals for C. ramiflora, L. racemosa, P. paludosa and N. fruticans were 59.0, 51.3, 84.7 and 97.3% respectively. On relatively raised lands, non-mangrove species, namely Acacia nilotica, Casuarina equisetifolia, Pithecellobium dulce, Samanea saman, Albizia lebbeck and A. procera were promising. After eight years, these species had a survival of 69, 65, 85, 61, 60 and 19% respectively with good height and diameter increments. Thus, a sustainable forest cover in the coastal areas of Bangladesh can be ensured. Perhutanan pantai di Bangladesh dimulakan pada tahun 1996 menggunakan spesies primer Sonneratia apetala dan Avicennia officinalis. Spesies pokok iaitu Excoecaria agallocha, Heritiera fomes dan Xylocarpus mekongensis; spesies pokok renek iaitu Cynometra ramiflora dan Lumnitzera racemosa serta species palma iaitu Phoenix paludosa dan Nypa fruticans sesuai sebagai tanaman giliran kedua. Excoecaria agallocha, H. fomes dan X. mekongensis masing-masing merekodkan kemandirian 90.3%, 84.7% dan 58.3%. Purata pertambahan tinggi tahunan untuk ketiga-tiga spesies tersebut masing-masing 1.03 m, 0.59 m dan 0.14 m manakala pertambahan diameter masing-masing 0.92 cm, 0.39 cm dan 0.15 cm. Kemandirian untuk C. ramiflora, L. racemosa, P. paludosa dan N. fruticans masing-masing 59.0%, 51.3%, 84.7% dan 97.3%. Penanaman spesies bukan bakau seperti Acacia nilotica, Casuarina equisetifolia, Pithecellobium dulce, Samanea saman, Albizia lebbeck dan A. procera di tanah yang lebih tinggi adalah menggalakkan. Selepas lapan tahun, spesies tersebut masing-masing merekodkan kemandirian 69%, 65%, 85%, 61%, 60% dan 19% serta mempunyai pertambahan ketinggian dan pertambahan diameter yang baik. Justeru, litupan hutan yang mapan di kawasan pantai Bangladesh boleh dijamin.

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