ASSESSMENT OF SEEDLING ABUNDANCE, SURVIVAL AND GROWTH OF TWO DIPTEROCARP SPECIES IN PEAT SWAMP FORESTS OF BRUNEI DARUSSALAM

Authors

  • Hazimah Haji Mohd Din Universiti Brunei Darussalam (UBD)
  • Nor Basirah Bakiri Universiti Brunei Darussalam (UBD)
  • Rahayu Sukmaria Sukri Universiti Brunei Darussalam (UBD)
  • Faizah Haji Metali Universiti Brunei Darussalam (UBD) http://orcid.org/0000-0002-2508-1535

DOI:

https://doi.org/10.11598/btb.2018.25.2.805

Keywords:

Borneo, Dipterocarpaceae, Dryobalanops rappa, relative growth rates, Shorea albida

Abstract

Dryobalanops rappa Becc. and Shorea albida Sym. are Bornean endemics of high conservation value and increasingly threatened by anthropogenic disturbances. In-situ study of seedling abundance and growth performance of these Dipterocarp species was conducted in two selected peat swamp forests of Brunei Darussalam, following a mast fruiting event in March–May 2014. Within six 6 x 6 m plots at each forest site, D. rappa seedlings at the Anduki peat swamp forest and S. albida seedlings at the Badas peat swamp forest were measured for abundance at the initial census in September 2014, as well as survival and relative growth rates (RGR) after a period of 5 months, with the final census in February 2015. We found significantly higher seedling abundance for D. rappa (1885 ± 208) than S. albida (160 ± 71). Significantly higher percentage survival was recorded for D. rappa seedlings (90.8 ± 2.2%) in comparison to S. albida seedlings (81.7 ± 2.2%). S. albida seedlings (0.24 ± 0.02 mm mm-1 month-1) showed significantly greater RGR in stem diameter than D. rappa seedlings (0.18 ± 0.02 mm mm-1 month-1), however, there were no significant differences in the RGRs based on seedling height, leaf number and biomass between D. rappa and S. albida seedlings. In terms of seedling abundance and percentage survival, D. rappa seedlings appeared to be more successful in regeneration and may potentially be used for rehabilitation of degraded tropical peat swamps and other forest types. Our results suggested that greater conservation efforts of peat swamps must be made to protect the Bornean endemic plant species, in particular S. albida.

Author Biographies

Hazimah Haji Mohd Din, Universiti Brunei Darussalam (UBD)

Environmental and Life Sciences ProgrammeFaculty of Science, UBD

Nor Basirah Bakiri, Universiti Brunei Darussalam (UBD)

Environmental and Life Sciences ProgrammeFaculty of Science, UBD

Rahayu Sukmaria Sukri, Universiti Brunei Darussalam (UBD)

Senior Assistant Professor Environmental and Life Sciences ProgrammeFaculty of Science, UBD

Faizah Haji Metali, Universiti Brunei Darussalam (UBD)

LecturerEnvironmental and Life Sciences ProgrammeFaculty of Science, UBD

Downloads

Published

2018-09-26

Issue

Section

Short Communication