SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Effect of national-scale afforestation on forest water supply and soil loss in South Korea, 1971–2010 
Authors:Kim, G.S., C.-H. Lim, S.J. Kim, J. Lee, Y. Son and W.-K. Lee 
Article ID:1017 
URL (non-DOI journals): 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:climate change and land use change 
Secondary Application Category:sediment loss and transport 
Watershed Description:99,720 km^2 country of South Korea with particular focus on the 64,081 km^2 portion that is forested. 
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Abstract:Afforestation of forests in South Korea may provide an example of the benefit of afforestation on precipitation storage and erosion control. In this study, we presented the effects of afforestation on water supply and soil loss prevention. A spatio-temporal simulation of forest water yield and soil loss was performed from 1971–2010 using InVEST water yield and SWAT models. A forest stock change map was produced by combining land cover data and National Forest Inventory data. The forest water yield increased about twice with changes in forest stock and climate from 1971–2010 and showed a spatially homogeneous water supply capacity. In the same period, the soil loss decreased more than three times, and the volatility of soil loss, in the 2010s, was smaller than before. The analysis of the change in forest stock without considering climate change showed an increase of 43% in forest water yield and a decrease of 87% in soil loss. An increase in precipitation increased the water yield, but also increased the soil loss volume. A change in forest stock led to positive changes in both. This study presents functional positive effects of the afforestation program in South Korea that can be useful in various afforestation programs in other countries. 
Keywords:afforestation; forest water yield; soil loss; forest stock change; InVEST; SWAT