| Summary: | Since the 1990s, the Semarang-Demak coastal area experienced abrasion. To protect abrasion, there have been many attempts such as planting mangroves, in which its development has shown success. The purpose of this study was to analyze environmental factors that play a role in the growth of mangroves ecosystem in the Semarang-Demak coastal area. Mangrove data were obtained by field studies using the transect method in three coastal areas. Each station is determined by the next station with five plots of size 20 m x 20 m. Data on supporting environmental factors are measured in each area including temperature, salinity, pH, light intensity, nutrients, and rainfall. Based on the results of analysis and calculations, the order of important values from large to small is A. marina, A. alba, R. mucronata, S. casseolaris, and R. stylosa, while environmental factors still fulfill mangrove growth. However, it needs to be aware of the increase in waves and temperatures that could threaten the survival of mangroves.
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