The purpose of this study was to analyze the level of mangrove density, the level of production and decomposition of mangrove litter in Jang River Estuary, Bukit Bestari District, Tanjungpinang City. Determination of the research location using purposive sampling method based on development activities around the Muara Jang River mangrove area, including the area of community settlement development (station 1), landfill area for the construction of shop houses and housing (station 2) and the area without development activities (station 3). To measure the density of mangroves using a plot of 10 x 10 m2 with 3 plots, to measure the production of mangrove litter using litter and to measure the decomposition of mangroves using litter with a 0.5 cm mesh size placed under mangrove trees that are still affected by tides. The results showed the level of mangrove density at station 1 was 1033 ± 51 trees/ha with good criteria and moderate density, station 2 was 933 ± 115 trees/ha with rare damage and density criteria, and station 3 was 1367 ± 208 trees/ha with good criteria and moderate density. The level of mangrove litter production at Station 1 is 5.14 grams dry weight / m2, Station 2 is 2.80 grams dry weight / m2, and Station 3 is 6.67 grams dry weight / m2. The mangrove decomposition rate at station 1 was 63.33%, station 2 was 62.05% and station 3 was 67.73%.
The potential for CO2 uptake in oil palm which is supported by the presence of solar radiation reception space can support the photosynthesis process to take place properly. This study aims to show the correlation between the results of identifying the distribution of oil palm through aerial photographs, namely drones, and the potential for CO2 uptake. The potential for CO2 uptake in oil palms for five samples of planting years is viewed from the aspect of canopy projection space density, cropping patterns, and spacing which is clarified by the allometric multiplied results of the potential CO2-eq uptake. In general, the five samples of oil palm planting years apply a triangular cropping pattern with a spacing of 9 m × 9 m. The canopy projection for the 2017 planting year, shows that oil palm plants are still at a distance from one another because the canopy is still short, in the 2011 planting year shows the canopy projection that has touched each other but there is still room for receiving solar radiation that can occur evenly so that between the two planting years Oil palms in the planting years 2005, 2003, and 1997 showed a mutually contrasting canopy projection between the oil palms so that even though the space for receiving solar radiation is small. The potential for CO2 uptake was greater because apart from being obtained from the atmosphere, it can also be obtained from understorey plants and organs decomposed plants. It concluded that the higher the density of the distribution of palm oil makes large the potential uptake of CO2 emissions. It is hoped that the identification of the potential for CO2 absorption in oil palm can use a multi-spectral drone as an aerial photo facility.
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