Estimation of Soil Organic Carbon (SOC) Stock in South Korea Using Digital Soil Mapping Technique

Seong-Jin Park; Soon-Ik Kwon; Seong-Heon Kim; Jaehong Shim; Yun-Hae Lee; Taek-Keun Oh

doi:10.7745/KJSSF.2021.54.2.247

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2021 Vol.54, Issue 2 Preview Page Next Page

Short communication

Estimation of Soil Organic Carbon (SOC) Stock in South Korea Using Digital Soil Mapping Technique

31 May 2021. pp. 247-256

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Abstract

Estimation of soil organic carbon (SOC) stocks is highly relevant considering that SOCs is the central driver in soil fertility and climate change mitigation. This study aims to (i) evaluate the SOC stock in the first 0 - 30 cm and 0 - 100 cm soil layer on a national scale from spatially explicit explanatory environmental variables and a legacy soil database and (ii) the spatial distribution of SOCs at national scale through digital mapping technique. A spatial model was established using Cubist, a decision tree algorithm and based on soil data (s factor), climatic (c factor), topographic (r factor). Results showed that soil texture, soil parent, mean annual precipitatio and elevation were the most important predictors of SOCs. The Cubist prediction model had a Root Mean Squared Error (RMSE) equal to 19.5 at 0 - 30 cm, 68.7 at 0 - 100 cm. The predicted mean SOC stock from fitted models was 35 ton C ha^-1 for 0 - 30 cm depth, 87 ton C ha^-1 for 0 - 100 cm soil depth. In total, soil stored approximately 330 Mt C for 0 - 30 cm depth and 842 Mt C for 0 - 100 cm depth.

Uncertainty (95%) and spatial distribution map of predicted SOC stocks (ton C ha^-1, 0 - 30 cm soil depth) in South Korea.

Keywords

Carbon stock

Digital soil mapping

Soil organic carbon

South Korea

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Information

Publisher :Korean Society of Soil Science and Fertilizer
Publisher(Ko) :한국토양비료학회
Journal Title :Korean Journal of Soil Science and Fertilizer
Journal Title(Ko) :한국토양비료학회 학회지
Volume : 54
No :2
Pages :247-256
Received Date : 2021-03-26
Revised Date : 2021-03-31
Accepted Date : 2021-05-10
DOI :https://doi.org/10.7745/KJSSF.2021.54.2.247

Korean Journal of Soil Science and Fertilizer ISSN:0367-6315(Print) 2288-2162(Online) 한국토양비료학회 학회지

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