THE ROLE OF NITRATE, PHOSPHATE AND SEDIMENT TYPE AS FACTORS CONTROLLING SEAGRASS DENSITY ON PANJANG ISLAND, CENTRAL BANGKA.
DOI:
https://doi.org/10.33019/jtms.v9i2.8062Keywords:
Phosphate, Sediment type, Seagrass density, Nitrate, Panjang IslandAbstract
Seagrass is an important ecosystem in coastal areas that plays a role in maintaining water stability, providing habitat for biota, and supporting primary productivity. Seagrass growth and density are influenced by environmental factors including the availability of nutrients in the substrate such as nitrate and phosphate, as well as the characteristics of sediment types. This study aims to analyze the relationship between nitrate and phosphate content in sediment and its types with seagrass density in Panjang Island Waters. Data collection was carried out using the quadrant transect method at three stations with nine observation substations extended 100 m towards the open sea. Substrate samples were analyzed in the laboratory to determine nitrate and phosphate content based on the applicable Indonesian National Standard (SNI). Sediment type analysis used dry sieving for the 4.75-0.038 mm fraction and wet sieving for the 0.0625-0.001 mm fraction, then classified using the Wentworth system and Shepard's triangle. Relationship analysis was carried out using Principal Component Analysis (PCA). The results showed that seagrass density ranged from 31-50 ind/m² with Cymodocea rotundata dominating. Analysis of the relationship between nitrate phosphate and sediment type to seagrass density using PCA showed that phosphate and clay sediment types clustered in the same main component and correlated with seagrass density.
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