Multianalysis Between Chlorophyll-a and Environmental Factors in Sanmen Bay

Sanmen Bay is a bay with a large degree of twists and turns and complex topography. With a large area of beaches and rich marine resources such as biological, it has important economic and ecological significance in the coastal area of the East China Sea. Based on a three-year monthly survey of chlorophyll a in the water body of Sanmen Bay from January 2020 to December 2022, a multiple stepwise regression analysis was conducted on chlorophyll a and related environmental factors such as water temperature (T), total organic carbon (TOC), chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), and dissolved oxygen (DO). Significant environmental factors related to chlorophyll a were found, and a multiple regression equation was established. In addition, the temporal and spatial distribution of chlorophyll a content was also analyzed. The results showed that the spatial and temporal differences of chlorophyll-a content in Sanmen Bay were large, ranging from 0.1 to 100 μ g / L. Chlorophyll a concentration was positively correlated with water temperature, COD and TP, negatively correlated with do, TN and TN / TP, but not with pH.