In the second year, activities were carried out to measure: 1) the decomposition rate of litter from rehabilitated mangroves, 2) the dynamics of nutrient release from mangrove litter, 3) the diversity of crabs in rehabilitated mangrove ecosystems, and 4) the fertility analysis of rehabilitated mangrove substrates. All four research targets for the second year were fully implemented in the field. Productivity and decomposition rate analyses have been completed, while the second, third, and fourth targets are still under laboratory analysis. The dynamics of nutrient release from mangrove litter is a continuation of productivity and decomposition measurements, to be analyzed descriptively to provide justification for nutrient dynamics conditions occurring in rehabilitated mangrove ecosystems.

The activities included data analysis based on observations in the restored mangrove ecosystem of Lubuk Kertang. Crab diversity analysis at the research site is currently undergoing morphological justification. The observation stations represent mangrove ecosystems with different restoration periods: Station 1 (S1) Restoration Forest 2013 (Rhizophora apiculata), Station 2 (S2) Restoration Forest 2011 (Rhizophora apiculata), Station 3 (S3) Restoration Forest 2009 (Rhizophora apiculata), and Station 4 (S4) Natural Mangrove Forest (Rhizophora apiculata). Observations were conducted from day 14 up to day 168.

At the beginning of the observation, the dry weight of litter from the 2013 and 2011 restoration forests was equal and higher compared to the 2009 restoration forest and natural mangroves. At Stations 3 and 4, the dry weight approached zero on day 140 and reached zero on day 154. This differed from Stations 1 and 2, where litter was fully degraded and reached zero weight on day 168. These results indicate that organic matter from mangrove litter at Stations 1 and 2 degraded completely into inorganic compounds by microorganisms on day 168, while at Stations 3 and 4 the process occurred faster, by day 154.