Pedosphere (2): 603--613, 2026
ISSN 1002-0160/CN 32-1315/P
©2026 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of soil erosion-deposition rate and mollic epipedon thickness on sloping farmland soil nutrients in the Mollisol region of Northeast China |
Chang LIU1, Gang LIU1,2 , Qiong ZHANG1,2, Chenxi DAN1, Yuqian HAN1, Enshuai SHEN1, Zhen GUO3 |
1 State Key Laboratory of Soil and Water Conservation and Desertification Control, College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation), Northwest A&F University, Yangling 712100 (China);
2 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100 (China);
3 Sichuan Huabiaoce Testing Technology Co., Ltd., Chengdu 610097 (China) |
| ABSTRACT |
| Severe soil erosion in Northeast China has led to significant declines in the mollic epipedon thickness (MET) and soil nutrient contents (SNs), thereby reducing soil productivity. However, the correlations among MET, soil erosion-deposition rate (SED), and SNs remain uncertain. This study aimed to explore the combined effects of SED and MET on SNs. Three sloping farmlands in Keshan, Binxian, and Hailun, Heilongjiang in the Mollisol region of Northeast China were selected to investigate the distribution characteristics of MET, SED, and SNs. The slope lengths and gradients were 200-276 m and 1.3°-1.9°, respectively. An inverse correlation was observed between SED and MET. The SNs were lower in the middle section of the slope, whereas they increased in the foot section. The changes in SED, MET, and SNs exhibited a wave-like trend. According to correlation analysis, SED was negatively correlated to SNs, while MET was positively correlated with SNs. However, when MET exceeded 40 cm, the inverse relationship between SED and SNs diminished. Consequently, MET cannot be disregarded in the prevention and control of soil erosion. A regression equation was fitted to model the relationship between MET (less than 40 cm) and SNs and SED. Comprehensive consideration of SED, MET, and SNs at different positions on the slopes is particularly crucial when designing effective soil and water conservation measures. This study provides a scientific basis for the control of soil erosion and the protection of Mollisol resources. |
| Key Words: black soil,crop yield,137Cs-tracing technology,ground penetrating radar,quantitative relationship,soil fertility |
| Citation: Liu C, Liu G, Zhang Q, Dan C X, Han Y Q, Shen E S, Guo Z. 2026. Effects of soil erosion-deposition rate and mollic epipedon thickness on sloping farmland soil nutrients in the Mollisol region of Northeast China. Pedosphere. 36(2): 603-613. |
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