Land Use and Climatic Conditions Control the Soil Organic Carbon’s Distribution in Qufu and Laixi, North China Plain
Huafeng Liu 1, 2  
,   Huanfang Huang 3, 4  
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Shandong Institute of Geological Survey, Jinan 250013, China
Shandong Engineering Research Center of Land Quality Geochemistry and Pollution Prevention, Jinan 250014, China
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
Huanfang Huang   

Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Kehua, 510640, Guangzhou, China
Submission date: 2020-08-06
Final revision date: 2020-10-16
Acceptance date: 2020-10-31
Online publication date: 2021-02-22
Understanding the factors controlling the distribution of soil organic carbon (SOC) is crucial to estimate SOC stocks and explore the optimal soil management for carbon sequestration and migrating climate change. Herein, we quantitively evaluated the influences of land use (farmland and wasteland), soil properties (pH, eight heavy metals, and seven minerals), and climatic conditions (temperature and precipitation) on the spatiotemporal variation of SOC in surface soils (0-20 cm) and soil columns (180 cm) in Qufu and Laixi, North China Plain. SOC concentrations in surface soils and soil columns were 1.84-27.4 and 1.82-9.33 g/kg, respectively. With ca. 64% of SOC stored in 20-180 cm layers and the dramatic increase rate of >70% for SOC in soil columns, SOC in subsoil showed its more considerable significance than that in the surface soil. Land use and climatic conditions contributed avg. 45.6 and 41.5%, respectively, to SOC in surface soils and 54.3 and 26.6%, respectively, in soil columns. Our results suggest the dominant influences of land use and climatic conditions on the SOC distribution and reemphasize the considerable importance of SOC in subsoil because of the high storage and storage potential of SOC in subsoil.