STUDY ON THE ABUNDANCE OF HETEROTROF BACTERIA ON LEAF LITTER MANGROVE IN COAST AREA SEDATI-SIDOARJO OF EAST JAVA

Abstract

Heterotrophic bacteria are responsible for degrading and recycling important elements such as carbon, nitrogen and phosphorus. Decomposers bacteria in mangroves litter, its existence has not been so much studied. Paper presents the results of study of the amount or abundance of rotting bacteria in the Avicennia marina, Sonneratia sp. and Rizopora apiculata on the coast of Sedati-Sidoarjo of East Java. Research method is experimental with field scale using Randomized Block Design or Randomized Complete Block Design by dividing the research for three blocks area, and statistics analysis with ANOVA. These results show that nearly 70% of mangroves in this area have been exposed or damaged. This is caused by human activities such as logging, opening of ponds and exposure of waves. The result of measurement of water quality parameter in this research ranged for pH 5.5-7.3, salinity 28-35, brightness 25-50 cm. Soil quality parameters are nitrite 0.143 mg/L, phosphate 0.160 mg/L, ammonia 2.05 mg/L, COD 80 mg/L and BOD 34 mg/L. Litter weight are 230.97 g/m2/year or 2.3 ton/ha/year in which leaf litter is the largest component of other organic waste. Waste production in this area is low compared to the result of Nurhasanah (1998) which reported 2.75 ton/ha/year. Statistics analysis with ANOVA showed significant difference between mangroves (p=0,000).

Keywords

• Hetrotrof bacteria
• mangrove
• Avicennia maria
• Sonneratia sp.
• Rhizopora apiculata