Malays. Appl. Biol. (December 2002) 31(2): 63-70
ABOVE GROUND BIOMASS ESTIMATION AND DISTRIBUTION OF ANNONACEAE IN A 50 HECTARE PLOT AT PASOH FOREST RESERVE, NEGERI SEMBILAN, MALAYSIA
NIZAM, M.S.*, NUJHAN, A. and MAT-SALLEH, K.
School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.
ABSTRACT
Data on Annonaceae in a 50-ha permanent plot at Pasoh Forest Reserve, Negeri Sembilan, obtained from the Forest Research Institute of Malaysia (FRIM) were used to assess primary productivity and distribution of the family. The data were based on three censuses conducted in 1985, 1990 and 1995. From the 1995 data, 19 genera and 42 species of Annonaceae were recorded in the plot. A total of 23,597 Annonaceae trees were enumerated of which the most abundant species was of Anaxagorea javanica (7,598 trees). Total above ground biomass of the family was estimated at 8.45 t ha"1, and the highest above ground biomass was represented by Monocarpia marginalis, estimated at 1.84 t ha"1. The biomass estimation for 15 years increased significantly (ANOVA, p< 0.001) between the three censuses. Distribution wise, soil type is shown as an influential factor as well as the topographies.
ABSTRAK
Data Annonaceae di dalam plot 50-ha di Hutan Simpan Pasoh, Negeri Sembilan telah diperolehi daripada Institut Penyelidikan Perhutanan Malaysia (FRIM) untuk kajian analisis produktiviti primer dan taburan famili ini. Data adalah berdasarkan bancian pada tahun 1985, 1990 dan 1995. Data tahun 1995 merekodkan sebanyak 19 genus dan 42 spesies Annonaceae dalam plot kekal tersebut. Daripada 23,597 pokok Annonaceae yang telah dikira, Anaxagorea javanica menunjukkan kelimpahan yang tertinggi (7,958 pokok). Secara keseluruhan, biojisim atas tanah bagi Annonaceae adalah dianggarkan berjumlah 8.45 tan ha'1, dan Monocarpia marginalis merupakan spesies yang paling tinggi anggaran nilai biojisim atas tanah iaitu berjumlah 1.84 t ha"1. Peningkatan biojisim Annonaceae selama 15 tahun adalah signifikan (ANOVA, p< 0.001) berbanding dengan setiap pengukuran yang dilakukan. Jenis tanah dan topografi didapati mempengaruhi taburan spesies Annonaceae di dalam plot ini.
Key words: Annonaceae, above ground biomass, Pasoh.
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