Judul: Pengaruh Kerusakan Penutupan Vegetasi Rawa Gambut Terhadap Komunitas Ikan di Sungai Merang, Kabupaten Musi
Abstrak: Vegetation around Merang River is the last peat swamp forest in South Sumatera. Before the year of 2000, forest usage rights/licences (HPH) activity was the main cause destroyig peat swamp vegetation but recently illegal logging is the main factor of ecosystem and fish community damage. The aim of this reseach was to observe the effect of vegetation damage on fish community. Method used was field survey to collected basic data of vegetation, soil, water quality, animal and fisheries biology. The ecosystem of peat swamp forest in Merang River was degradated because of HPH activity, since 1989 until 2002. It made the peat swamp forest became secondary forest gaining 90% from the original ecosystem. At least 21 kinds of trees with medium diversity in this forest. The most of important value index were on manggris, punak and rengas types. The sum of type and individu of vegetation and fish in upstream area were more than borderland and below areas. The diversity of fish was medium with sum of fish type above 40 type. Linier Regression Analysis showed that vegetation cover had a positive impact to fish population. The vegetation covered channel area including seep and floodland area. Often the fish was not afford to live in the opened area, without the covering vegetation. Another factor affecting to fish population was water quality. Illegal logging activity caused oxidation of pirit to sulphate acid. Based on canonic variable, the higher alight, the lower debit and the low turbidity made the more uniform the fish. The other factor affecting fish population was electricity elusive kit to catch fish by poeple .
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Judul: Struktur Komunitas Makrozoobentos sebagai Bioindikator Kualitas Lingkungan Perairan Hilir Sungai Musi
Abstrak: One of the problems exist on this time was more decreased it water quality of Musi river especially at downstream part as consequence the increasing of various activity antropogenic and industrial activity in downstream waters of Musi river. The research was done from April to July 2007 by purposive random sampling method at 18 stations and analisys in representative laboratory. The purpose from this research can give based information about characteristics of changes structure of makrozoobenthos community was can be used as bioindicator about environmental quality in downstream waters of Musi river. Results of this research was found 25 species macrozoobenthos devided into 6 class and 3 phyllum. There is Tubifex sp, Lumbriculus sp, Haplotaxis sp, Branchiura sp, Nereis sp, Nepthys cormuta, Cossura sp, Chironomous sp, Hydropsche sp, Polycentropus sp, Palpomya sp, Gomphoides sp, Bellamya javanica, Bellamya sumatrensis, Melanoides tuberculata, Anentome sp, Pila ampullacea, Thiara sp, Corbicula javanica, Anodonta woodiana, Gammarus sp, Namalycastis sp, Cirratulus sp, and Physa sp. The highest density was dominated by class Oligochaeta that is Tubifex sp were 86.94 % in April and 87.74 % in July 2007. Based on study biology parameter showed that the environmental quality in downstream waters of the Musi river was categorized into 3 groups that is group 1 ; heavy polluted (poor water quality) the marked of existence lower diversity index, higher density and higher dominance index were dominated species Tubifex sp in April and July 2007 was found at the stations Musi Kramasan, Muara Ogan, Ampera, Wilmar, Pusri, and Hoktong, group 2 ; moderate polluted (fair water quality) was found at the stations Gandus, Pre Ogan, Sungai Kundur, Pulau Borang, PT. SAP, SST. Pulau Burung and Tanjung Buyut were the marked diversity index low to moderate, lower density and lower to moderate dominance index lower to moderate with the species marked is Hydropsche sp, group 3 ; light polluted (good water quality) was found at the stasiun Pulokerto, Upang, Pre Selat Cemara, Selat Cemara and Pulau Payung the marked with diversity index and was by moderate and lower dominance index were dominated Gammarus sp. From the results was found several tolerant species that can be used as bioindicator environmental quality in downstream waters of Musi river is Tubifex sp, Lumbriculus sp, Nereis sp and Chironomous sp was categorized as heavy pollution indicator (poor water quality), Facultative species is Hydropsche sp as indicator light to moderate pollution and Gammarus sp as indicator clean water restoration zone (self-purification).
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Judul: Struktur Kristal dan Ikatan Molekul Lithium Okisda dan Niobium Pentaoksida
Abstrak: Lithium oksida dan niobium pentaoksida merupakan material yang digunakan dalam pembuatan lithium niobat. Pendugaan struktur kristal menggunakan perbandingan jari-jari ionik menunjukkan bahwa lithium oksida dan mobium pentaoksida memiliki struktur oktahedron, sedangkan hasil karakterisasi XRD menunjukkan lithium oksida memiliki struktur kubik dengan parameter kisi 4.617 Å dan niobium pentaoksida memiliki struktur monoklinik dengan parameterkisia sebesar 18.5070 Å, b sebesar 7.7679 Å dan c sebesar 17.5994 Å. Hasil karakterisasi FTIR, lithium oksida dengan gugus Li-O memiliki kontanta pegas 641.77 Nm¹ pada bilangan gelombang serapan 864 cm-1. dan 1088 cm-1.. Sedangkan gugus Li-O-Li memiliki konstanta pegas 537.67 Nm¹ pada bilangan gelombang serapan 1003 cm-1.dan 1435 cm-1.. Niobium pentaoksida dengan gugus fungsi Nb-O memiliki konstanta pegas 1200 Nm pada bilangan gelombang serapan 1222 cm-1., gugus fungsi Nb-O memiliki konstanta pegas 522 cm¹ pada bilangan gelombang serapan 809 cm-1, dan gugus fungsi Nb-O-Nb memiliki konstanta pegas 443 Nm¹ pada bilangan gelombang serapan 509 cm-1 dan 736 cm-1…
Keyword: Crystal Structure, Lithium Oxide, Molecule Bond, Niobium Pentaoxide, Spring Constant, Daerah serapan, Sinar inframerah, Karakterisasi XRD, Kazrakterisasi FTIR