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| Erosion characteristics of sloping croplands in typical black soil region and its effects on nitrogen migration |
| Received:July 14, 2024 |
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| KeyWord:mollisol;soil erosion;nitrogen loss;slope position;extreme precipitation |
| Author Name | Affiliation | E-mail | | WANG Jianxi | Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | | | GAO Lei | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | lgao@issas.ac.cn | | QIAN Rui | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LIU Xia | Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China | | | PENG Xinhua | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China
1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China | |
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| Abstract: |
| To clarify the erosion and deposition characteristics at different positions on sloped farmland in a typical black soil region and the nitrogen migration driven by these processes. Through in-situ dynamic monitoring in 2023, the erosion and deposition rates at different slope positions were quantified, and the impact of erosion on nitrogen migration was elucidated. The result shows that：during the study period, the sloped farmland experienced moderate erosion, with erosion rate of 2 530.7 t·km-2·a-1, the soil loss rate was 1 085.5 t·km-2·a-1 and an annual soil loss thickness of 0.99 mm. The erosion and deposition characteristics varied significantly across different erosion sites, altering the spatial pattern of black soil layer thickness on the slope. The middle slope was identified as a "hotspot" for black soil loss, with 3.5 mm of soil erosion in 2023, while the upper slope lost 1.8 mm, and the lower slope saw an increase in black soil layer thickness by 6.8 mm. Soil erosion had a significant impact on nitrogen migration, with an annual total nitrogen（TN）loss intensity of 18.9 kg·hm-2 on the sloped farmland. The nitrogen loss intensities were 37.2 kg·hm-2 on the upper slope and 57.9 kg·hm-2 on the middle slope, whereas 113.3 kg · hm-2 was deposited at the lower slope. Extreme rainfall events played a crucial role in black soil erosion and nitrogen migration. Asingle extreme rainfall event, accounting for 22% of the annual precipitation, contributed 34% of the runoff, 49% of the sediment yield, and 44% of the nitrogen loss. The erosion and deposition of soil on slop farmland in typical black soil regions exhibit distinct temporal and spatial characteristics, significantly influencing soil nitrogen loss. The middle slope area is a "hotspot" for erosion and nitrogen loss, while extreme rainfall events are the "hot moments" for these processes. |
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