东北黑土坡面降雨和汇流对土壤团聚体流失和颗粒迁移的影响

doi:10.16843/j.sswc.2023.01.001

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Abstract [Background] Soil loss area on the slope croplands of the Chines Mollisol reached 214 100 km², accounting for 19.7% of the totle land area. Soil aggregates loss and particle transport is often identified as the main mechanism that leads to nutrient loss. This reduces soil fertility and affects the utilization of Mollisol resources. Thus, to study the effects of rainfall and inflow on soil aggregate loss and particle transport may deepen the understandings of soil degradation processes driven by soil erosion and provide scientific basic for soil resource sustainability.[Methods] This study applied simulated rainfall and inflow experiments to investigate effects of rainfall and inflow on soil aggregate loss and particle transport in a 10° sloping landscape of Mollisol region of Northeast China. The experimental treatment included two rainfall intensities of 50 and 100 mm/h (R₅₀ and R₁₀₀), one inflow rate of 100 mm/h (I₁₀₀), and the combinations of rainfall intensity and inflow rate (50 mm/h rainfall intensity + 50 mm/h inflow rate (R₅₀I₅₀), 50 mm/h rainfall intensity + 100 mm/h inflow rate (R₅₀I₁₀₀), 100 mm/h rainfall intensity + 50 mm/h inflow rate (R₁₀₀I₅₀)).[Results] 1) Under the same amount of water supply, the sloping soil erosion rate under the R₁₀₀ treatment was 1.9 and 2.4 times compared with the R₅₀I₅₀ and I₁₀₀ treatments, respectively; and the soil erosion rate under the R₁₀₀I₅₀ treatment was 1.3 times compared with R₅₀I₁₀₀ treatment, which indicated that the effect of rainfall on sloping soil erosion was greater than that of inflow. 2) When rainfall played a dominant role in the process of sloping water erosion, such as the R₅₀, R₁₀₀, R₅₀I₅₀ and R₁₀₀I₅₀ treatments, the loss of<0.25 mm aggregates increased by 20.6%, 16.7%, 17.9% and 21.8% respectively, compared with the tested soil. When inflow took a dominant role in the process of sloping water erosion, such as the I₁₀₀ and R₅₀I₁₀₀ treatments, the loss of ≥ 0.25 mm accounted for 61.9% and 65.2%, respectively, which demonstrated that the dispersion effect of inflow water on Mollisol aggregates was less than that of rainfall. Moreover, MWD (mean weigh diameter) value could better reflect the characteristics of soil aggregate loss. 3) The total loss of sand and clay particles under the R₁₀₀, I₁₀₀ and R₅₀I₅₀ treatments increased by 1.4%-9.5%, compared with the R₅₀ treatment; the proportion of sand particle loss under the R₅₀I₁₀₀ and R₁₀₀I₅₀ treatments increased by 0.8%-4.0%, compared with the R₁₀₀, I₁₀₀ and R₅₀I₅₀ treatments; and it increased by 3.7%-6.0% compared with the R₅₀ treatment; while the total proportion of silt and clay particles decreased accordingly, indicating that the loss of coarse particles increased with an increase of inflow rates.[Conclusions] The dispersion action of rainfall on Mollisol aggregates was larger than that of inflow and the sorting action of sediment particles in the depended on the action degree of rainfall and inflow in sloping water erosion process.

Key words： rainfall inflow aggregate loss particle transport Chinese Mollisol region

Received: 08 October 2022

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S157.1

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	QIN Qishan
	ZHENG Fenli
	SHI Hongqiang
	WANG Xuesong
	WANG Bin
	LI Zhi
	ZHANG Jiaqiong

Cite this article:

QIN Qishan,ZHENG Fenli,SHI Hongqiang, et al. Impacts of slope rainfall and inflow in Mollisol region of Northeast China on the soil aggregate loss and particle transport[J]. SSWC, 2023, 21(1): 1-9.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2023.01.001 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2023/V21/I1/1

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