Export of non-point source suspended sediment, nitrogen, and phosphorus from sloping highland agricultural fields in the East Asian monsoon region

• Published in: Environmental monitoring and assessment 2016-12, Vol.188 (12), p.692-692, Article 692
• Main Authors: Reza, Arif, Eum, Jaesung, Jung, Sungmin, Choi, Youngsoon, Owen, Jeffrey S., Kim, Bomchul
• Format: Article
• Language: English
• Subjects: Agricultural land; Agricultural runoff; Agriculture; Atmospheric Protection/Air Quality Control/Air Pollution; Downstream; Earth and Environmental Science; Ecology; Ecotoxicology; Environment; Environmental Management; Environmental Monitoring; Eutrophication; Geologic Sediments - analysis; Intensive farming; Land use; Monitoring/Environmental Analysis; Nitrogen; Nitrogen - analysis; Nonpoint source pollution; Nutrients; Phosphorus - analysis; Republic of Korea; Soil erosion; Surface runoff; Surface water; Suspended sediments; Water Movements; Water Pollutants, Chemical - analysis; Water Quality; Watersheds; Wind
• ISSN: 0167-6369; 1573-2959
• DOI: 10.1007/s10661-016-5681-9

Excess sediment and nutrient export from agricultural fields with steep slopes is a major concern linked to surface water quality in Korea. In this study, the export of suspended sediment (SS), total nitrogen (TN), and total phosphorus (TP) and their event mean concentrations (EMCs) in surface runoff from a highland mixed land use (61% forested, 30% cropped, 9% other) watershed were quantified. In 2007, the Korean Ministry of Environment (MoE) declared the study area as a priority region for non-point source (NPS) pollution management and initiated various best management practices (BMPs) in the study watershed. SS, TN, and TP concentrations in Mandae Stream were monitored for 5 years (2009–2013) to evaluate the effectiveness of BMPs. Average EMCs for SS, TN, and TP were as high as 986, 3.4 and 0.8 mg/L, respectively. The agricultural export coefficients of agricultural land in the study watershed for SS, TN, and TP were 5611, 171, and 6.83 kg/ha/year, respectively. A comparison with results from other studies shows that both EMCs and agricultural export coefficients in the study watershed were much higher than most of the results reported for watersheds in other regions. The results show that sediment and nutrient export from intensive agriculture areas with steep slopes continue to be a major concern for the downstream reservoir, Lake Soyang. Remedial strategies should be directed towards controlling sources of SS, TN, and TP to improve downstream water quality in sloping highland agricultural areas in Korea.