The Community Structure and Diversity of Sungai Bersejarah Mangrove in Sungai Apit District, Siak Regency

Mangroves are plants that live in the intertidal zone of the tropics and some sub-tropics. Mangrove ecosystems have many functions, which can be grouped into ecological and economic functions. The Sungai Bersejarah mangrove area is an educational tourism location managed by the conservation group Laskar Mandiri. The objective of the study was to analyze the structure and diversity of the mangrove community in the Sungai Bersejarah Mangrove area, which includes species, density, frequency, coverage, and importance value index. The environmental parameters measured were temperature, salinity and pH. The research was carried out from June to August 2021 using the quadrant line transect method. A total of five line transects were established in the mangrove area, each of which was placed in three plots measuring 10 m x 10 m (tree group) and 5 m x 5 m (sapling group). The study result indicate that there are 11 species of mangrove for the tree group and 9 species for the sapling group. Species Rhizophora apiculata was found to have the highest density, frequency, cover and important value index values, both for tree groups and sapling groups. The index values obtained are diversity (H′) 2.8626 and 2.1821, dominance index (C) 0.1835 and 0.3416 and eveness index (E) 0.8275 and 0.6884 for trees and saplings, respectively.