Judul: Identification and Economic Analysis of Plant Biodiversity Sowang (Endemic Plants in Mountain Cycloops Jayapura Regency Papua)
Abstrak: Plant Sowang (Xanthosthemon Novaguineense Valet) is a plant endemic to the island of New Guinea. Population growth is increasing rapidly, causing pressure on the local economic development, resulting in the need for agricultural / farming increase, illegal logging by the company to take advantage of communities, settlements and infrastructure. Of the phenomenon resulted in the conversion of land to nature reserve Mountains region Cycloops be an option that can not be avoided and cause damage to areas including nature reserves have been damaged Sowang Plant species biodiversity. Total economic value (TEV) of plant Sowang IDR 19.284.348.053.906 ($ 2,142,705,339) per year, consists of the use of plants directly Sowang IDR 179.326.000, Willingness to Pay (WTP) Values of IDR 84.462.106, bequest value of IDR 34.182.274.440 and Existence value of IDR 19.249.901.991.360. The role of indigenous peoples is very important in preserving plant Sowang have rules that are used, because the forest is a "natural mother" of indigenous peoples.
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Judul: Vegetation Analysis And Utilization By Ethnic Wondama Which Is living In The Wondiboy Mountains Natural Reserve , Land Papua
Abstrak: Pegunungan Wondiboy - CAPW) still keep their custom and traditional wisdom (ecological wisdom) to use all natural resources around them, including plants. The objective of this research is to know about the plant diversity at species level in the forest community of the Wondiboy Mountains Natural Reserve and the level of plant utilization by the locals in that area. A descriptive method was used in this research by combining interview and field survey techniques. The standard procedure of vegetation analysis and the useful value analysis were applied to analyse the data. Results of the research show that the highest index (Importance Value) of trees at 0-500 m asl. in Eastern side dominated by Pometia pinnata (17.3%) and Myristica lepidota Bl. (17.3%) in Western side. Poles dominated by Dalbergia sp.1 (37.1) in Eastern side and Spondias cytherea Sonnerat (35.2%) in Western. Saplings dominated by Carallia brachiata (Lour.) Merr. (15.8%) in Eastern side and Semecarpus aruensis Engl. (15.9%) in Western. Seedlings dominated by Phanera lingua (DC.) Miq. (22.3%) in Eastern side and Clerodenrum sp.1 (19.3%) in Western side. While, trees at 500- 1000 m asl. dominated by Agathis sp. (29.3%) in Eastern side and Intsia bijuga (19.5%) in Western side. Poles also dominated by Pometia sp. (43.3%) in Eastern side and Haplolobus moluccanus (Leenh.) H. J. Lam (31.2%) in Western. Samplings dominated by Gnetum gnemon (23%) in Eastern side and Gnetum gnemon (15.2%) in Western. Seedlings dominated by Nephrolepis falcate (Cav.) C. Chr. (28.6%) in Eastern side and Zysygium sp.7 (14.4) in Western. Furthermore, the average of species richness (R’) of trees is 3.996; poles 2.076, saplings 2.281; and seedlings 1.327. The average of species abundance (H’) of trees is 2.361; poles 1.513; saplings 2.017; and seedlings 1.533. And also the average of the species evenness (E) of trees is 0.989; poles 0.962; samplings 0.946; and seedlings 0.959. Furthermore, from the vegetation structure had been reported from that area, trees is vegetation with the highest number in utilization by the locals (1622), and subsequently followed by poles (923.5), saplings (1134), seedlings (241), and liana (84. 12). And the fuel wood (firewood) is the main plant utilization of locals in this area. In addition, the several species were found in plots of vegetation profile; however we separated between vertical and horizontal projection. In vertical view, Pometia pinnata (27 m) is species dominant in plot I, Ficus benjamina Bl. (34 m) in plot II, and Planchonia papuana Knuth. (31 m) in plot III, and Erioglossum rubiginosum (Roxb.) Bl. (29 m) in plot IV. While in horizontal, Dalbergia sp.1 12.2% (from total 99%) in plot I, Pometia pinnata 15.5% (from total 97.8%) in plot II, Aistopetalum viticoides Schltr. 13.5% (from total 98.4%) in plot III, and Teijsmanniodendron sp 16.3% (from total 96.7%) in plot IV.
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Judul: Sintesis layered double  hydroxide (LDH) dan aplikasinya sebagai adsorben kromium heksavalen (Cr(VI))
Abstrak: Layered double hydroxide (LDH) merupakan material hidrotalsit yang dapat berperan sebagai adsorben ion Cr(VI) melalui mekanisme tukar anion, adsorpsi-reduksi, dan interaksi elektrostatik. LDH MgAl dan MgAlFe disintesis menggunakan metode kopresipitasi dengan rasio molar M2+:M3+ sebesar 9:4,5. Hasil difraktogram XRD LDH MgAlFe menunjukkan terbentuknya fase hidrotalsit dengan puncak basal d003 mengalami pergeseran ke daerah 2θ yang lebih besar dibandingkan LDH MgAl, hal ini menandakan berkurangnya ukuran spesi basal dari LDH MgAlFe. Studi skala laboratorium dilakukan dalam mengkaji dosis dan profil isoterm adsorpsi dari LDH sebagai adsorben Cr(VI) yang dilakukan pada pH 4. Aplikasi LDH sebagai adsorben ion Cr(VI) menggunakan dosis optimum 12,5 mg/mL. Profil adsorpsi LDH MgAl mengikuti model isoterm Langmuir dan memiliki nilai kapasitas adsorpsi maksimum (Qm) sebesar 45,95 mg.g-1, sedangkan profil adsorpsi LDH MgAlFe mengikuti model isoterm Freundlich dan memiliki nilai kapasitas adsorpsi maksimum (Qm) sebesar 37,54 mg.g-1. Hasil adsorpsi menunjukkan bahwa LDH MgAl dan MgAlFe dapat berfungsi sebagai adsorben potensial dalam penanganan limbah ion Cr(VI)., Layered double hydroxide (LDH) is a hydrotalcite material that can serve as a Cr(VI) adsorbent through anion exchange, adsorption-reduction, and electrostatic interaction mechanisms. LDH of MgAl and MgAlFe materials were synthesized using the coprecipitation method with a M2+:M3+ molar ratio of 9:4,5. The results of the XRD diffractogram of LDH MgAlFe showed the formation of a hydrotalcite phase with a basal peak of d003 shifting to an area 2θ larger than that of LDH MgAl, which indicated a reduction in the basal spacing of LDH MgAlFe. A laboratory study was conducted to examine the dose and profile of the adsorption isotherm of LDH as Cr(VI) adsorbent at pH 4.The LDH can adsorb Cr(VI) at the optimum dose of 12.5 mg/mL. The LDH MgAl adsorption profile followed the Langmuir model has a maximum adsorption capacity (Qm) value of 45.95 mg.g-1. The MgAlFe LDH adsorption profile followed the Freundlich model has a maximum adsorption capacity (Qm) value of 37.54 mg.g-1. The adsorption results show that LDH MgAl and MgAlFe can function as promising adsorbents for treating Cr(VI) waste.
Keyword: isoterm adsorpsi, kromium heksavalen, layered double hydroxide, limbah ion logam