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Pribadi, R. 1998 The ecology of mangrove vegetation in Bintuni Bay, Irian Jaya, Indonesia, PhD Dissertation, Stirling University.
    © R. Pribadi, 1998. Use of any part of this thesis for any purpose must be acknowledged.

Abstract

The ecology of mangrove forests on Potential Acid Sulphate soils at Bintuni Bay (132 55' - 134 02' E and 2 02' - 2 97' S), Irian Jaya, Indonesia was studied. The annual rainfall is 3000 mm and there is mixed semi-diurnal tide of 1 - 5.6 m amplitude. The water has a varying salinity of 0 - 27%.

Forest structure was studied in plots of 10 m x 10 m along three transects across Sikoroti Island and in three 50 m x 50 m plots in mixed Rhizophora - Bruguiera forest. All trees > 10 cm trunk diameter were enumerated, measured and identified. Of the nine tree species, Rhizophora apiculata was the most dominant, followed by Bruguiera gymnorrhiza and Ceriops decandra. There was good regeneration seven years after clear-felling in plots on Amutu Besar and Amutu Kecil Islands.

Small litterfall production, measured using ten 1 m x 1 m litter traps in each of the three 50 m x 50 m plots, was 11.09 t ha-1 y-1, and greatest during the wet season (December, 1.29 t ha-1) and least during the dry season (July, 0.61 t ha-1). The annual litterfall mineral element accession was (kg ha-1 y-1): N 240.4, P 6.1, K 43.2, Na 136.2, Ca 204.4 and Mg 48.7. Leaf decomposition of five species was studied in litterbags on the forest floor under trees of the same species. Sonneratia alba decomposed quickly with a half-life of 24 days, and Bruguiera parviflora was the slowest with a half-life of 124 days. Decomposition rates of all species followed a single exponential decay model.

Leaf herbivory of young stands of Rhizophora apiculata and Bruguiera gymnorrhiza was significantly different among sties, species, plant height and leaf-age. Seed predation on six species was studied in three different sites. Twenty propagules of each species were secured by string in each of six 10 m x 10 m sub-plots within each of five 10 m x 60 m plots. On average 62.1 % of the seeds were dead after 36 d. Predation was higher in the lower intertidal zone, and Avicennia alba and Bruguiera parviflora were the most predated.

The results suggested that the Bintuni Bay mangroves can be sustainably managed but the best silvicultural system needs to be determined.


Ringkasan

* Terjemahan dalam Bahasa Indonesia belum tersedia.


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