Judul: Pengaruh Sifat-sifat Tanah terhadap Zonasi Hutan Mangrove Banyuweclang, Kabupaten Buleleng, Bali
Abstrak: Peneli tian ini bertu,juan mempelaj ari sifat-sifat tanah clan sifat-sifat vegetasinya. Selanjutnya clilakukan pengujian statistik untuk menetapkan sifat-sifat tanah mana yang berbecla nyata antara keempat lahan mangrove clan sifatsifat tanah yang menyebabkan terbentuknya zonasi hutan mangrove tersebut. Disamping itu dipelajari pula sifatsifat tanah yang berpengaruh terhadap kanclungan unsur dalam daun mangrove dan perkembangan akarnya. Sifat-sifat tanah lapisan atas ,,ang menjadi pembecla antara lahan Rhizophora dengan lahan Ceriops, lahan Avicennia clan lahan Lumnitzera adalah: pH H20, pH KCl, Corganik, N-total, t1g-dd, Na-dd, total basa, KTK, Al-dd, Hdd, Fe, S, FeS2, S03 dan persen debu. Pada lapisan bawah pembeda tersebut masih ditambah dengan P-tersedia, K-clcl dan persen pasir. Pembecla lahan Rhizophora dengan lahan Ceriops masih ditambah dengan P-tersedia pacla tanah lapisan atas. Pembecla lahan Rhizophora clengan Avicennia clan lahan Lumnitzera ditambah clengan persen pasir pacla tanah lapisan atas clan Ca-dd pada tanah lapisan bawah. Sifat tanah yang mempengaruhi terbentuknya zona Rhizophora adalah pH-CaC12 dan persen liat pada tanah lapisan atas dan H-dd pada tanah lapisan bawah_ Sifat-sifat tanah yang menjadi pembed.a antara lahan Ceriops dengan lahan Avicennia adalah: C-org.smik, N-total, K-dd dan KTK pada tanah lapisan atas serta C-organik, Ntotal, K-dd, KTK dan persen pasir pada tanah lapisan bawah_ Pembeda antar·a lahan Ceriops dengan lahan Lumnitzera adalah: C-organik, N-total, Na-dd dan persen liat pada tanah lapisan atas serta C-organik, N-total, Mg-dd, Na.-dd, persen debu, persen liat dan total basa pada tanah lapisan ba.wah_ Terbentuknya · zona Ceriops dipeng.aruhi oleh: basa-basa pada tanah lapisan atas serta C-organik dan per-sen debu pada tanah lapisan b.awah _ Sifat-sifat tanah yang menjadi pembeda antara lahan Avicennia dengan lahan Lumnitzera adalah: Mg-dd, K-dd, Na-dd, total basa dan KTK pada tanah lapisan atas serta Mg-dd, K-dd, Na-dd, H-dd dan total basa pada tanah lapisan bawah. dst ...
Keyword: Zonasi Hutan Mangrove, Banyuweclang

Judul: Hubungan Sifat Tanah dan Tipe Vegetasi Mangrove di Desa Blanakan, Kabupaten Subang.
Abstrak: Mangrove ecosystem is a typical marine tropics and subtropics with a very important role for the balance of nature. However, currently the target of exploitation of mangrove forests due to the demands of development which focuses on economic interests. More than a half of the mangrove forest area in Indonesia in a bad damaged state, around the North Coast of Java, has long been eroded by the needs of its population to the land. Mangrove forests that relatively in good condition on the north coast of Java is in the village Blanakan, so the mangroves in the area need to be in the preserve. This study aims to determine the nature and characteristics of soil that affect the growth of mangrove land the village and to know the relationship of the soil properties with different types of mangrove vegetation that grows in the village Blanakan. There are 4 zones studied based on the type of vegetation growing in these locations. Zone 1 (BSR1) with vegetation Avicennia marina, zone 2 (BSR2) with Rhizophora mucronata vegetation, zone 3 (BSR3) with vegetation Jeruju, and zone 4 (BSR4) with vegetation Sonneratia acida. The sample of soil that have been researched are morphological and chemical properties. All of soil conditions are not significantly different by morphology. Those all zones are type Hydraquent soil. Chemical properties which have an influence on mangrove vegetation difference are the Electrical Conductivity (DHL/EC), water content at field condition, percentage saturation of the cations, the percentage of ESP, and SAR values, and value of soil. The DHL/EC, the percentage of ESP, and SAR values show the influence of sea water. Zone 1 had the soil more ripe than zone 2, 3, and 4. Cation saturation of each zone has its own characteristics. A base saturation zone was dominated by sodium saturation and followed by increasing the depth of soil. Zone 1 showed many salt-free and the salt free content increased from the upper to the lower layer. Base saturation in zone 2, between the top layer of soil is different from the middle layer and bottom layer. The top layer of soil in zone 2 was dominated by the saturation of magnesium, but in the middle layer and bottom layer was dominated by sodium saturation. Sodium saturation in zone 2 further decreased, this suggest that salt-free in this zone was diminishing compared to zone 1. In zone 3 and zone 4, there are no free salts and base saturation was dominated by magnesium, and also increased of addition calcium.
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Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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