Publication Details

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Title (Primary) Environmental drivers of spatial patterns of topsoil nitrogen and phosphorus under monsoon conditions in a complex terrain of South Korea
Author Jeong, G.; Choi, K.; Spohn, M.; Park, S.J.; Huwe, B.; Ließ, M.;
Journal PLOS ONE
Year 2017
Department BOPHY; BOSYS;
Volume 12
Issue 8
Language englisch;
POF III (all) T31;
Supplements https://doi.org/10.1371/journal.pone.0183205.s001
https://doi.org/10.1371/journal.pone.0183205.s002
https://doi.org/10.1371/journal.pone.0183205.s003
https://doi.org/10.1371/journal.pone.0183205.s004
UFZ wide themes RU1;
Abstract Nitrogen (N) and phosphorus (P) in topsoils are critical for plant nutrition. Relatively little is known about the spatial patterns of N and P in the organic layer of mountainous landscapes. Therefore, the spatial distributions of N and P in both the organic layer and the A horizon were analyzed using a light detection and ranging (LiDAR) digital elevation model and vegetation metrics. The objective of the study was to analyze the effect of vegetation and topography on the spatial patterns of N and P in a small watershed covered by forest in South Korea. Soil samples were collected using the conditioned latin hypercube method. LiDAR vegetation metrics, the normalized difference vegetation index (NDVI), and terrain parameters were derived as predictors. Spatial explicit predictions of N/P ratios were obtained using a random forest with uncertainty analysis. We tested different strategies of model validation (repeated 2-fold to 20-fold and leave-one-out cross validation). Repeated 10-fold cross validation was selected for model validation due to the comparatively high accuracy and low variance of prediction. Surface curvature was the best predictor of P contents in the organic layer and in the A horizon, while LiDAR vegetation metrics and NDVI were important predictors of N in the organic layer. N/P ratios increased with surface curvature and were higher on the convex upper slope than on the concave lower slope. This was due to P enrichment of the soil on the lower slope and a more even spatial distribution of N. Our digital soil maps showed that the topsoils on the upper slopes contained relatively little P. These findings are critical for understanding N and P dynamics in mountainous ecosystems.
ID 19158
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=19158
Jeong, G., Choi, K., Spohn, M., Park, S.J., Huwe, B., Ließ, M. (2017):
Environmental drivers of spatial patterns of topsoil nitrogen and phosphorus under monsoon conditions in a complex terrain of South Korea
PLOS One 12 (8), e0183205