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http://dx.doi.org/10.9715/KILA.2020.48.1.025

A Structural Relationship of Topography, Developed Areas, and Riparian Vegetation on the Concentration of Total Nitrogen in Streams  

Lee, Sang-Woo (Dept. of Forestry and Landscape Architecture, Konkuk University)
Lee, Jong-Won (Dept. of Forestry and Landscape Architecture, Graduate School, Konkuk University)
Park, Se-Rin (Dept. of Forestry and Landscape Architecture, Graduate School, Konkuk University)
Publication Information
Journal of the Korean Institute of Landscape Architecture / v.48, no.1, 2020 , pp. 25-34 More about this Journal
Abstract
Land use in watersheds has been shown to be a major driving factor in determining the status of the water quality of streams. In this light, scientists have been investigating the roles of riparian vegetation on the relationships between land use in watersheds and the associated stream water quality. Numerous studies reported that riparian vegetation could alleviate the adverse effects caused by land use in watersheds and on stream water quality through various hydrological, biochemical and ecological mechanisms. However, this concept has been criticized as the true effects of riparian vegetation must be assessed by comprehensive models that mimic real environmental settings. This study aimed to estimate a comprehensive structural equation model integrating topography, land use, and characteristics of riparian vegetation. We used water quality data from the Nakdong River system monitored under the National Aquatic Ecosystem Monitoring Program (NAEMP) of the Korean Ministry of Environment (MOE). Also, riparian vegetation data and land use data were extracted from the Land Use/Land Cover map (LULC) produced by the MOE. The number of structural equation models (SEMs) were estimated in Amos of IBM SPSS. Study results revealed that land use was determined by elevation, and developed areas within a watershed significantly increased the concentration of Total Nitrogen (TN) in streams and LDI in riparian vegetation. On the contrary, developed areas significantly reduced LPI and PLAND. At the same time, PLAND and LDI significantly reduced the concentration of TN in streams. Thus, it was clear that developed areas in watersheds had both a direct and an indirect impact on the concentration of TN in streams, and spatial pattern and the amount of vegetation of riparian vegetation could significantly alleviate the negative impacts of developed areas on TN concentration in streams. To enhance stream water quality, reducing developed areas in a watershed is critical for long-term watershed management plans, restoration patterns for riparian vegetation could be immediately implemented since riparian areas were less developed than most other watersheds.
Keywords
Structural Equation Model; Water Quality; Land Use; Spatial Pattern; Riparian Vegetation;
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Times Cited By KSCI : 3  (Citation Analysis)
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