제주 연안 용천수의 용존유기물 및 영양염의 분포 특성
Distributions of Dissolved Organic Matter and Nutrients in Spring Waters along Jeju Island’s coast
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This study systematically investigated the nutrients and optical characteristics of dissolved organic matter (DOM) in 16 coastal spring waters distributed around Jeju Island. Significant spatial differences in water quality were observed, primarily reflecting regional geological settings, groundwater residence time, and anthropogenic activities such as fertilizer application. Notably high concentrations of nitrate were found in western sites, indicating strong influences from agricultural nitrogen loading. An optical analyses of both chromophoric (CDOM) and fluorescent DOM (FDOM), including optical indices, revealed that humic-like terrestrially derived DOM dominated most springs, while microbially-derived and protein-like DOM were also prominent in some locations. Principal component analysis (PCA) indicated that the variation in DOM and nutrient composition was governed by a combination of natural and anthropogenic factors. The findings highlight marked spatial heterogeneity in chemical and optical DOM properties and nitrogen pollution status among Jeju’s spring waters. This research provides an important scientific basis for the conservation of coastal water quality and a biogeochemical understanding of groundwater-coastal system interactions in a volcanic island context.
Abstract
This study systematically investigated the nutrients and optical characteristics of dissolved organic matter (DOM) in 16 coastal spring waters distributed around Jeju Island. Significant spatial differences in water quality were observed, primarily reflecting regional geological settings, groundwater residence time, and anthropogenic activities such as fertilizer application. Notably high concentrations of nitrate were found in western sites, indicating strong influences from agricultural nitrogen loading. An optical analyses of both chromophoric (CDOM) and fluorescent DOM (FDOM), including optical indices, revealed that humic-like terrestrially derived DOM dominated most springs, while microbially-derived and protein-like DOM were also prominent in some locations. Principal component analysis (PCA) indicated that the variation in DOM and nutrient composition was governed by a combination of natural and anthropogenic factors. The findings highlight marked spatial heterogeneity in chemical and optical DOM properties and nitrogen pollution status among Jeju’s spring waters. This research provides an important scientific basis for the conservation of coastal water quality and a biogeochemical understanding of groundwater-coastal system interactions in a volcanic island context.