Mangrove is a plant type influenced by tides action along the tropical coastlines. The tidal type will affect the soil properties, growth of soil microorganisms, and mangrove distribution. The purposes of the study were to analyzing the characteristics of mangrove soil in different habitat type including physical and chemical properties. The research was conducted in mangrove rehabilitation as site 1 and non-rehabilitation as site 2. This research was conducted from April 2020 to September 2020. Analysis of soil properties were consisted of substrate texture, pH, salinity, Organic Carbon, N-total, and P-available. These analyses carried out in Soil Laboratory, Faculty of Agriculture, Universitas Syiah Kuala. The determining of sampling location was done by using random stratified sampling method. Data were collected at 6 stations divided into 3 stations each site. The criteria for each station was based on tidal inundation. Each station was sampled randomly at three depths, namely 0-15 cm (top layer), 15-30 (sub layer) cm, and 30-45 cm (bottom). Soil textures in study areas were loamy sand, sandy loam, dusty loam, and clay in site 1, while in site 2 the soil textures were sandy loam, sandy clay loam, loamy sand, and dusty loam. The high sand and low clay percentage produce the average of organic carbon in the medium, low and very low categories, the organic carbon ranged from 0.25% to 2.18% in site 1 and 0.62% to 1.73% in site 2. The N and P content in site 1 and site 2 were ranged from 0.02% to 0.13%; 25.30% to 68.15% and from 0.04% to 0.11%; 2.60% to 37.85%, respectively. The pH average of mangrove soils indicated that the pH category was neutral, slightly alkaline, slightly acidic in site 1. In site 2 the pH categories were slighly alkaline, neutral, slightly acidic, and acidic. The soil salinity values at different sites indicated high and very high salinity.

Cellulolytic bacteria is one of the beneficial bacteria that can found in mangrove ecosystem. The purposes of study were to analyse the cellulolytic index, and to analyse the cellulase activity of bacteria isolated from soil mangrove. Qualitatively, assessment of cellulase activity were carried out at the Microbiology laboratory of Fish Quarantine Station, Quality Control and Safety of Fishery Products (SKIPM) Aceh, while quantitatively was observed in microbiology laboratory, Biology Department, IPB. Assessment of qualitative cellulase activity is performed by growing the selected pure isolate on 1% CMC medium then spilled 1% congo red to test its cellulolytic potential. Cellulolytic potential was determined by clear zone performed around the colony after congo red flooded. The quantitative cellulase enzyme activity test carried out by DNS method tested on one selective isolate. There were 21 from 39 isolates showed a clear zone isolated from mangrove soil. The cellulolytic index (CI) obtained ranged from 0.07 to 0.80 classified as low cellulolytic index criteria. The cellulolytic index was higher in bacteria isolated from mangrove rehabilitated than mangrove unrehabilitated. The highest cellulase activity and specific cellulase activity of BTMD32 was at 48 hours with the value were 0.0012 U/ml, 0.077 U/mg, respectively. The result concluded that the bacteria cellulolytic isolated from mangrove soil had low cellulolytic index, low cellulase activity, and low specific cellulase activity.