Dissertation : Spatial Distribution, Autecology, and Biodiversity of Sagoo (Metroxylon spp.) in Seram Island, Maluku

SAMIN BOTANRI. Spatial Distribution, Autecology, and Biodiversity of Sagoo (Metroxylon spp.) in Seram Island, Maluku. Under supervision of DEDE SETIADI, EDI GUHARDJA, IBNUL QAYIM, and LILIK BUDI PRASETYO.

Sago palm (Metroxylon spp.) is a tropical plant. Its area distribution in Indonesia is the largest in the world, covering 50-60 % of world’s Sago area. It is multifunction plant, however, it is still under utilized. Ecologicaly, sago palm well adapted on fresh water or peat swamp, riverine zone, surrounding water or swamp forests. Unfortunately, there is no any valid information on its area distribution. Moreover, regarding species diversity of Sago is also unclear. Based on the above facts, it is an urgent need to know its ecological aspect, spatial distribution and species diversity. The research was conducted in March to November 2009 at the Seram Island, Maluku. Spatial distribution was developed by Supervised classification of Landsat TM coupled with ground survey to collect Ground Control Points (GCPs) for accuracy assessment. Further field survey was done to collect autecological data. Isozyme analysis was also conducted to identify species diversity. Output supervised classification of Landsat-5TM image in 2007, showed that potential area of sago palm at the Seram Island was 18.239 ha. Characteristic of the habitat was distributed in the lowland (elevation less than 250 m asl), flat area, around river, near from beach, and on alluvium soil (sediment). Population structure of sago palm in the nature community follows young growth pattern, in wich rate seedling mortality was about 76,82 %. Regarding the species, M. rumphii Mart. species is the most dominant vegetation which cover 43,3 % of habitat. As adaptation strategy in swampy condition, sago palm form roots which was vertically directed to reach water surface. In sago palm community there was negative interspecific association indicated by Jaccard index less than 0,2. Abiotic component significant effected growth and sago fluor production. The variable that most have significantly effect to growth and sago flour production were micro temperature, micro relative humidity, bulk density, soil acidity, and salinity. The potential clump population at the Seram Island was about 3,2 million clump or approximately of about 1,5 million trunk of trees. M. rumphii Mart. and M. sylvestre Mart. species were the most potential with production capacity of about 566,04 kg starch/trunk and 560,68 kg starch/trunk, respectively. Genetic analysis by isozyme proved that initially known five species of Sago in the Seram Island was actualy only two species, namely Metroxylon rumphii (concist of M. rumphii Mart., M. sylvestre Mart., M. longispinum Mart, and M. microcanthum Mart.), and Metroxylon sagu Rottb.

Keywords : spatial distibution, habitat type, abiotic component, Metroxylon spp., and Seram Island.

Correspondence Author : Samin Botanri (saminbot@yahoo.co.id)

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