Judul: Pengaruh Lama Pengeringan terhadapViabilitas Propanggul Rhizophora mucronata
Abstrak: Potensi mangrove yang sangat besar di Indonesia senantiasa mendapat ancaman yang terus meningkat sejalan dengan pertambahan penduduk yang semakin tingi. Luasan mangrove dikhawatirkan akan terus mengalami penurunan apabila tidak dilakukan usaha-usalia untuk merehabilitasinya Rhizophora mucronata merupakan salah satu jenis yang di jadikan prioritas dalam kegiatan rehabilitasi daerah pantai. walaupun demikian permasalahan seringkali timbul berhubungan dengan keterbatasan persediaan propanggul di lapangan. Oleh karena itu untuk menjaga kontinuitas persediaan propagul yang bermutu diperlukan suatu teknik penyimpanan propagul. Lamanya penyimpanan propagul sangat dipengaruhi oleh kadar air propanggul. Propagul dengan kadar air yang terlalu tinggi atau terlalu rendah tidak dapat di simpan dengan aman karena akan berpengaruh negatif terhadap viabilitasnya Mengingat besarnya pengaruh kadar air terhadap viabilitas dan pertumbuhan tanaman, maka diperlukan suatu teknik pengeringan dalam ha1 ini pengaturan kadar air yang tepat sehinga kabilitas propagul dapat terbga dengan baik dan dapat di simpan dengan aman untuk jangka waktu sepanjang mungkin.
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Judul: Pengaruh media simpan, ruang simpan dan lama penyimpanan terhadap viabilitas Propagul Rhizophora mucronata
Abstrak: The potention of mangrove forests in Indonesia has been decreasing. Therefore, rehabilitation is necessary in order to maintain sustainability of forest ecosystems. One of the efforts is the replanting of mangrove forest. The success of planting depends on the availability of seed. Seeds can not be obtained any time if needed so that storage seed is necessary for seed viability can be maintained within a certain time period until the time of planting arrives. The problem has been arise because of Rhizophora mucronata is a recalcitrant seed, which is at certain moisture content that relatively high, the propagule tend to be easy to germinate and if the moisture content is low, the propagule will be die or loss of their viability. This study aims to investigate the influence of storage media, storage room and time of storage on propagules viability of Rhizophora mucronata and to compare the germination from the rapid test (cutting test) with the germination from the direct test. This study used a factorial experiment with completely randomized design (CRD) factorial 5x2x2 with 3 replicates. The details of the factors are: factor A (time of storage) consists of A0 (0 weeks), A1 (1 week), A2 (2 weeks), A3 (3 weeks), and A4 (4 weeks); factor B (storage room) consists of B1 (AC room) and B2 (living room); and factor C (storage media) consists of C1 (sawdust) and C2 (coconut husk). Working procedures of this study consist of the preparation phase (the container store, room storage, storage media and germination media), collecting of propagule, propagule selection, storage of propagule, propagule cutting test, seeding propagule, maintenance and retrieval of data. The data collected is the result of cutting test from propagule, the percentage of rooted propagule (PB), moisture content (MC), germination (DB), germination value (NP), the growth rates (KT), shoot and root ratio (NPA). Based on these results, the influence of interaction between storage time, storage room and storage media caused significant differences on germination propagule R. mucronata. The influence of interaction between storage time and storage room caused significant differences to the percent of rooted from propagule R. mucronata. The influence of storage time and storage media caused significant differences in seedling roots to shoot ratio of R. mucronata. In this study, coconut husk media storage that is placed in the air conditioner room capable to maintaining the viability of propagule R. mucronata until the time of storage for 4 weeks. The result of estimation methods viability propagule R. mucronata with cutting test is relatively similar with the directly propagul germination test results.
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Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology