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Chairul Mahmud
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Dinamika Populasi Anakan Pohon Klimaks Calophyllum soulattri Burm dan Swintonia schwenkii T.&B Di Hutan Bukit Pinang-Pinang Sari Fatul Husna; Erizal Mukhtar; Chairul Mahmud
Jurnal Biologi Universitas Andalas Vol 4, No 1 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.1.%p.2015

Abstract

A study on population dynamics of Calophyllum soulattri Burm and Swintonia schwenkii T.&B in Pinang-Pinang rain forest have been carried out from September 2012 to Februari 2013 by using descriptive method. Data were collected after 23 years of demographic data available. We found that the highest seedling mortality of Calophyllum soulattri was at the height class of 11-30 cm (9.4 %) and the lowest was at the height class of 71- 80 cm (3.4 %). The heighest seedling mortality of Swintonia schwenkii was  at the height class of 11-20 cm (10.3 %) and the lowest was at height class 51-60 cm (2.9 %). Relative height growth rate of Calophyllum soulattri seedling was at the height class of 21-30 cm (0.38 cm/cm/yr). Whereas relative height growth rate of Swintonia schwenkii seedling was at the height class of 31-40 cm (0.21 cm/cm/yr). Keywords: dynamics population, Calophyllum soulattri, Swintonia schwenkii,mortality, relative high growth rate.
Analisis Vegetasi Gulma pada Kebun Kopi Arabika (Coffea arabica L.) di Balingka, Agam, Sumatera Barat Indah Prafitri Yussa; Chairul Mahmud; Zuhri Syam
Jurnal Biologi Universitas Andalas Vol 4, No 1 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.1.%p.2015

Abstract

The vegetation analysis of weed from Coffee Arabica (Coffea arabica L.) traditional farm in Balingka, Agam has been conducted from February to May 2014. The purpose of this study was to determine the composition and structure of weed on the farm. Vegetation was sampled systematically using square plot (1x1 m2) with a total 32 plots. The results found that composition of the weed in the farm were 11 families, 21 genera and 25 species. A total number of individuals were 3114. Borreria laevis dominated at the coffee farm with the highest SDR (Summed Dominance Ratio) (22.809%). Diversity index (H') of the weed in coffee farm was 2.04. Keywords: weed, Coffea arabica L., composition, structure
Co-Authors Erizal Mukhtar Indah Prafitri Yussa Sari Fatul Husna Zuhri Syam