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N fluxes in an agricultural catchment under monsoon climate: A budget approach at different scales

Title
N fluxes in an agricultural catchment under monsoon climate: A budget approach at different scales
Authors
Kettering J.Park J.H.Lindner S.Lee B.Tenhunen J.Kuzyakov Y.
Ewha Authors
박지형
SCOPUS Author ID
박지형scopus
Issue Date
2012
Journal Title
Agriculture, Ecosystems and Environment
ISSN
0167-8809JCR Link
Citation
vol. 161, pp. 101 - 111
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The purpose of this study was to develop options for a more sustainable catchment management, resulting in a reduction of agricultural non-point pollution of water resources in South Korean agricultural catchments. Therefore, an N budget analysis was conducted, which related N inputs into soil under intensive agriculture to N outputs at both field and catchment scale in a mountainous catchment in South Korea. The N budget of all investigated crops was positive, with total N inputs exceeding N outputs by 2.8 times. Radish showed the highest N uptake efficiency (43-45%), whereas rice showed the lowest with 24-30%. At the catchment scale, agriculture contributed over 90% to the maximum N surplus (473. Mg). Rice and radish, with over 100. Mg. N surplus each, contributed the largest part. Comparing these results to the N export in the catchment outlet, it was found that N leaching and surface runoff were the dominant loss pathways, leading to a seasonal inorganic N export of 329. Mg. Because fertilizer N was the major N input (>50%) for all crop types except soybean, its reduction was identified as the major scope of action for N savings at the field and catchment scale. The currently observed trend of land use change from annual to perennial crops additionally assists the reduction of N surplus but shows only a spatially limited applicability for the future. Further measures like split applications, application timing to match crop needs and cover crops during the fallow complement the attempt. © 2012 Elsevier B.V.
DOI
10.1016/j.agee.2012.07.027
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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