Simulated Soil Organic Carbon Density Changes from 1980 to 2016 in Shandong Province Dry Farmlands Using the CENTURY Model

Min Tang, Shihang Wang, Mingsong Zhao, Falyu Qin and Xiaoyu Liu
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Min Tang: School of Geomatics, Anhui University of Science and Technology, 168 Taifeng Road, Huainan 232001, China
Shihang Wang: School of Geomatics, Anhui University of Science and Technology, 168 Taifeng Road, Huainan 232001, China
Mingsong Zhao: School of Geomatics, Anhui University of Science and Technology, 168 Taifeng Road, Huainan 232001, China
Falyu Qin: School of Geography and Engineering of Land Resources, Yuxi Normal University, 134 Fenghuang Road, Yuxi 653100, China
Xiaoyu Liu: School of Information Engineering, Jiangsu Vocational College of Agriculture and Forestry, 19 E. Wenchang Road, Jurong 212400, China

Sustainability, 2020, vol. 12, issue 13, 1-17

Abstract: The changes in cultivated soil organic carbon (SOC) have significant effects on soil fertility and atmospheric carbon dioxide (CO 2 ) concentration. Shandong Province is an important agricultural and grain production area in China. Dry farmland accounts for 74.15% of the province’s area, so studies on dynamic SOC changes would be helpful to understand its contribution to the Chinese national carbon (C) inventory. Using the spatial overlay analysis of the soil layer (1:10,000,000) and the land use layer (1:10,000,000), 2329 dry farmland soil polygons were obtained to drive the CENTURY model to simulate SOC dynamics in Shandong Province from the period 1980 to 2016. The results showed that the CENTURY model can be used to simulate the dry farmland SOC in Shandong Province. From the period 1980 to 2016, the soil organic carbon storage (SOCS) and soil organic carbon density (SOCD) showed an initial increase and then decreased, especially after reaching a maximum in 2009. In 2016, the SOCS was 290.58 × 10 6 t, an increase of 26.99 × 10 6 t compared with 1980. SOCD in the dry farmland increased from 23.69 t C ha −1 in 1980 to 25.94 t C ha −1 in 2016. The dry farmland of Shandong Province was a C sink from 1980 to 2016. Among the four soil orders, inceptisols SOCD dominated, and accounted for 47.81% of the dry farmland, followed by >entisols > vertisols > alfisols. Entisols SOCD growth rate was the highest (0.23 t C ha −1 year −1 ). Compared to 1980, SOCD in 2016 showed an increasing trend in the northeast, northwest and southeast regions, while it followed a downward trend in the southwest.

Keywords: soil organic carbon density; dry farmland; CENTURY model; Shandong province (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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