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http://dx.doi.org/10.5338/KJEA.2009.28.1.032

Assessing Effects of Farming Activities on the Water Quality in a Small Agricultural Watershed  

Kim, Min-Kyeong (Climate Change & Agroecology Division, National Academy of Agricultural Science, RDA)
Roh, Kee-An (Climate Change & Agroecology Division, National Academy of Agricultural Science, RDA)
Park, Seong-Jin (Climate Change & Agroecology Division, National Academy of Agricultural Science, RDA)
Choi, Chul-Mann (Climate Change & Agroecology Division, National Academy of Agricultural Science, RDA)
Ko, Byong-Gu (Climate Change & Agroecology Division, National Academy of Agricultural Science, RDA)
Yun, Sun-Gang (Planning & Cordination Division, National Academy of Agricultural Science, RDA)
Lee, Jong-Sik (High-Tech Agriculture Division, Rural Development Administration)
Publication Information
Korean Journal of Environmental Agriculture / v.28, no.1, 2009 , pp. 32-37 More about this Journal
Abstract
This study was conducted to assess the impact of agricultural land use on the water quality in mountain village farmlands. Two soil types, paddy and upland soil were analysed for their chemical properties. Although, pH and organic matter contents were not significantly different to each other, concentrations of available P and exchangeable K and Ca were much higher in upland soil compared with those in paddy soil. The results of water quality analysis indicated that, in Goseong-cheon watershed, the nutrients contents were much higher in downstream area than in upstream area. Particularly, the elevation of $COD_{Mn}$ and T-P were significant during rainy season. When paddy fields coexist with upland fields, SS, T-N, and T-P concentrations in paddy fields were lower than those of upland fields. This may indicate that paddy fields possess an water-purifying ability by absorbing nutrients. This effect may reduce excessive nutrients discharged into the neighboring streams which may cause eutrophication problem. The difference between inflow and outflow of nitrogen and phosphorus during the cultivation period were measured as -98.9 kg $ha^{-1}$ and -29.7 kg $ha^{-1}$, which means that nutrient outflow was higher than inflow. This may suggest that much nutrient was discharged during the crop harvest period.
Keywords
Water quality; Assessment; Nutrient balance; Farming activities; Agricultural watershed;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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