Isotope signatures to trace the origin and fate of nitrate in the Soyang lake watershed First Field Work Season in South Korea
2 University of Bayreuth, Department of Soil Ecology
O 1.1 in From Cradle to Reality: Research Ideas at the Beginning
10.10.2013, 08:45-09:00, H6, GEO
Abstract: The Soyang lake watershed is composed of sub-catchments dominated by intensive agricultural management, and by pristine (semi-) natural broadleaf and coniferous forests. Therefore nitrate leaching into surface waters may have different origins. Heavy nitrogen fertilization in the agriculture-dominated Haean basin is expected to be the major contributor to the nitrate output into the Mandae River and nitrate input into the Soyang Lake. Whether nitrate from atmospheric nitrogen deposition or from a surplus of microbial nitrification in the forest-dominated sub-catchments also contributes to nitrate output is an open question. Within a sampling along the rivers and in the land around them, with a frequency ranging from one time after each rain event to every two hours, the sampling design was made to determinate the influence of the precipitation regimen and the land use in the nitrate discharge into the Soyang Lake Watershed. River water samples, soil water samples and rain samples were taken before and during the monsoon season to analyse the nitrate concentration and 15N abundance in each phase of the nitrogen cycle. Data from amount of rain and river discharge were taken to quantify the total export of nitrate from these sub-catchments in this period. This data base within the climate information shows us already how the monsoon season behaves in the Haean Valley and in the forest around it.
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