Turnover Bahan Organik Tanah pada Berbagai Tipe Vegetasi di Ekosistem Mangrove Desa Blanakan, Kecamatan Blanakan Kabupaten Subang

Abstract

Soils on mangrove ecosystem generally contain higher C-org than mineral soils on terrestrial ecosystem. The organic matter remained in soil as carbon deposit should be protected for its existence. This research aims to determine litter production, soil organic matter (SOM) content and how long SOM persists on mangrove ecosystem under various main vegetations. Materials used in this research include litters of various main vegetation on mangrove ecosystem i.e. Rhizophora, Avicennia, Sonneratia, and Bruguiera, and also disturbed soil samples from each mangrove vegetation. Those materials were analysed in laboratory, especially for measuring C-org content. The results showed that the average of litter production on mangrove ecosystem at Desa Blanakan, Kecamatan Blanakan, Kabupaten Subang is 10.02 ton/ha/year. The highest litter production was found for Sonneratia i.e. 18.38 ton/ha/year, followed by Bruguiera i.e. 10.14 ton/ha/year, Avicennia i.e. 6.96 ton/ha/year, and Rhizosphora i.e. 4.61 ton/ha/year. Soil C-org under Bruguiera vegetation in each soil depth was higher than soil Corg under Rhizophora, Avicennia, and Sonneratia vegetations. Soil C-org per hectare within 0-50 cm ranges between 59.38-67.25 ton in each main vegetation area. Average litter productions contribute 1.29-4.75 ton/ha organic carbon every year. Soil organic matter turnover under Sonneratia was faster than other main vegetations on mangrove ecosystem. Organic matter turnover on Sonneratia was 13 years, followed by Bruguiera, Avicennia, and Rhizospora i.e. 24, 27, and 48 years, respectively