Soil mesofauna is one group of soil biodiversity, which take main role of decomposition processes of organic matter. The objective of this research was to investigate the composition and diversity of soil mesofauna at Jobolarangan forest. Soil samples were collected from 8 sampling points which different vegetation types. Soil mesofaunas extracted by modified Barless-Tullgren extractor apparatus for 4 days. The results showed that in the north side of Jobolarangan forest were identified 6 groups of microarthropods, i.e.: Mesostigma and Astigma (Ordo: Acarina), Isotomidae (Ordo: Collembola), Rhinotermitidae (Ordo: Hymenoptera), Staphyllinidae and Carabidae (Ordo: Coleoptera). The group with highest density and wide distribution was Astigma. There were high diversities of soil mesofauna community structure at Jobolarangan forest.
Araceae merupakan herba dengan berbagai macam manfaat etnobotani yg dikenali dengan bunganya yang berbentuk tongkol dan tumbuh subur di kawasan hutan tropis. Hutan Air Terjun Berambai merupakan salah satu kawasan hutan sekunder dataran rendah yang sangat baik untuk pertumbuhan dan perkembangan familia Araceae. Tujuan dari penelitian ini adalah untuk mengetahui jenis dan karakteristik tumbuhan familia Araceae yang hidup di kawasan lantai hutan Air Terjun Berambai, Samarinda, Kalimantan Timur. Penelitian ini dilakukan dengan metode eksplorasi yaitu dengan menjelajahi kawasan Hutan Air Terjun Berambai. Hasil pengamatan menunjukan terdapat delapan jenis Araceae yang yaitu Pichinia disticha S.Y. Wong & P.C. Boice, Rhaphidophora australasica F.M. Bailey, Alocasia princeps W. Bull., Schismatoglottis calyptrata (Roxb.) Zoll. & Moritzi, Colocasia esculenta (L.) Schott, Aridarum sp., Amorphophalus paeoniifolius (Dennst.) Nicolson, dan Philodendron crassinervium Lindl. dengan karakter sintesis berupa berbatang basah, bunga berbentuk tongkol, dan berseludang. Tumbuhan familia Araceae yang ditemukan di Hutan Air Terjun Berambai tumbuh secara epifit maupun terestrial. Penelitian ini menjadi landasan data inventarisasi tumbuhan famili Araceae yang ada di lantai hutan Air Terjun Berambai, Samarinda, Kalimantan Timur yang belum ada sebelumnya.
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