Omo Rusdiana

Growth performance of Bruguiera gymnorrhiza derived from cutpropagule seedling

Kusmana C, Hidayat T, Istomo, Rusdiana O. 2018. Growth performance of Bruguiera gymnorrhiza derived from cut-propagule seedling. Biodiversitas 19: 208-214. The availability and existence of Bruguiera gymnorrhiza seed sources is getting decreased. This causes the generative reproduction of this plant is limited. The present research was carried out to study the growth performance of B. gymnorrhiza derived from vegetative cut-propagule seedling by employing different type of cut-propagule, the provision of root promoting hormones, and the provision of NPK fertilizer. The research was conducted at the Greenhouse for 6 months using a completely randomized design (CRD) 3x3x2 factorial with five replications. The results showed that B. gymnorrhiza could be propagated by cut-propagule. Seedlings growth which derived from complete propagule apparently had a better performance than those derived from cut-propagule. Roots derived from complete propagule and the bottom part of cut-propagule grow faster than the top part of cut-propagule. Two types of shoot such as shoot existing before planting which was derived from complete propagule and top part of cut-propagule; and shoots existing after planting called as adventitious shoot derived from the bottom part of cut-propagule has been formed. Unfortunately, new complete shoots derived from the bottom part of cut-propagule was not formed. Furthermore, there was no significant effect of root promoting hormone and NPK fertilizer induction on the shoot and root growth of B. gymnorrhiza.

IDENTIFIKASI TINGKAT KERAWANAN DEGRADASI KAWASAN HUTAN MANGROVE DESA MUARA, TANGERANG, BANTEN

This study is intended to estimate the vulnerability of degradation of mangrove forest in Muara Village, Tangerang, Banten. There are five species of mangroves found in mangrove forest of Muara, which are: Avicennia alba, Avicennia officinnalis. Rhizophora apiculata, Rhizophora stylosa, and Rhizophora mucronata. The results showed that the mangrove forest in Muara has a high vulnerability of degradation based on the three vegetation characteristics, such as: density, domination, and biodiversity of mangrove species. The density of mangrove vegetation has only reached 739 individual/Ha. While the biodiversity of mangrove species is low and the domination level of mangrove species is high, in which the dominant species is Rhizophora mucronata. Mangrove rehabilitation activities are required by revegetation methods, and the mangrove species that are used in revegetation process are local species which available in the mangrove forest of Muara. Mangrove rehabilitation process that needs to be done is by revegetation of mangroves and mangrove species conservation. Mangrove species which is suitable for mangrove rehabilitation in Muara Village are Rhizophora mucronata and Avecinnea alba