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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Siti Sofiah
Indonesian Institute of Sciences
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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FLORA DIVERSITY, COMPOSITION AND ECOLOGY IN BESIQ BERMAI TROPICAL FOREST OF DAMAI DISTRICT, EAST KALIMANTAN Siti Sofiah; Destario Metusala; Trimanto Trimanto; Siti Nurfadilah
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 25 No. 2 (2018)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2018.25.2.724

Abstract

Besiq Bermai Forest is part of Kalimantan forests known for vast plant diversity. The present study aimed to investigate flora diversity, composition, and ecology in Besiq Bermai Forest to support the management of biodiversity and forest conservation. Thirteen plots were established with different sizes of plots (100 m x 20 m plots for trees; 40 m x 5 m plots for saplings; and 5 m x 5 m plots for understory). Data recorded included plant species name and individual number of each plant species. Data analysed were Shannon-Wiener diversity index, Relative Density, Relative Frequency, Relative Dominance and Important Value Index. The principal component analysis (PCA) was performed to determine relationship between edaphic components and flora occurrence. The results showed that there were 93 species of trees (belonging to 48 genera and 22 families), 112 species of saplings (belonging to 62 genera and 43 families), and 48 species of understory (belonging to 28 genera and 20 families). Shannon-Wiener diversity index (H’) were 6.05, 6.25 and 3.26 for tree, saplings and understory, respectively. The most common family for tree and saplings in the forest ecosystem in this area was Dipterocarpaceae (Shorea spp). Species of tree with the highest importance value index were Dillenia excelsa, Syzygium sp. and Shorea parvifolia. The highest importance value index for species of saplings were Macaranga triloba and Shorea parvifolia; and for species of understory were Phrynium jagorianum. Ecological (edaphic) factors affecting the occurence and establishment of flora in Bermai forest were total N and C/N ratio. The present study has implication for the management of biodiversity and forest conservation.
STEMFLOW, THROUGHFALL AND RAINWATER INTERCEPTION OF EIGHT INDONESIAN TREE SPECIES Siti Sofiah; Soejono Soejono
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 27 No. 1 (2020)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2020.27.1.726

Abstract

Tree architecture affects how rainwater is partitioned into canopy interception, throughfall and stemflow. The canopy shape and bark/leaf surface morphology affects the plants’ ability to intercept and redistribute the rainwater. Hence, the tree structure plays a key role in soil and water conservation, especially in erosion runoff. This research was conducted to predict the most suitable tree species for soil and water conservation, and recorded 32 rainfall events during the rainy season in January 2014-March 2015 in Purwodadi-LIPI, Indonesia. The stemflow, throughfall, individual tree architectural characteristics, and leaf morphology were measured for eight selected local tree species namely: Sterculia cordata, Aleurites moluccanus, Buchanania arborescens, Calophyllum inophyllum, Dysoxylum gaudichaudianum, Peltophorum pterocarpum, Alstonia scholaris, and Pometia pinnata. The species which held the greatest amount of interception was Aleurites moluccanus at 68.1% of rainfall. Special characteristics of the leaves (like fine hairs), globose stem and long, grooved bark, probably resulted in an  increased relative interception of the rain water that was higher than those of other trees. The throughfall and stemflow for each species were closely related to rainfall amount but not related to rainfall intensity. 
Co-Authors Destario Metusala soejono soejono Solly Aryza Trimanto Trimanto