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Effect of Soil and Water Conservation Measures on Runoff and Sediment Yield from Purple Soil Slopes Under Different Rainfall Patterns
ZHENG Yu, LI Li, DING Wen-feng
Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (6) : 87-93.
PDF(7337 KB)
PDF(7337 KB)
Effect of Soil and Water Conservation Measures on Runoff and Sediment Yield from Purple Soil Slopes Under Different Rainfall Patterns
[Objective] Previous studies in China on slope erosion characteristics under rainfall patterns have primarily focused on the loess region of Northwest China and red soil region of South China. Research on the purple soil region remains limited. Purple soil is the dominant cultivated soil in the Three Gorges Reservoir Region. Following the reservoir’s construction, substantial cultivated land was submerged, compelling local residents to reclaim more steep slopes for cultivation. This has exacerbated soil erosion issues in this region. Considering both rainfall patterns and land characteristics, this study conducted a comparative analysis of runoff and sediment reduction effects under different soil and water conservation (SWC) measures on purple soil slopes in the reservoir area. Understanding the response characteristics of runoff and sediment yield on purple soil slopes to SWC measures under different rainfall patterns could provide theoretical basis for evaluating the effectiveness of SWC measures in purple soil regions. [Methods] Using runoff and sediment yield data from 37 rainfall events across 10 runoff plots under different SWC measures in purple soil regions, rainfall patterns were classified using K-means clustering based on four indicators: average intensity (Iave), maximum 30-minute intensity (I30), duration (T), and erosivity (Rr). [Results] The results showed that the 37 rainfall events were classified into five patterns: Type I (low erosivity, long intensity, long duration), Type II (medium-low erosivity, medium-low intensity, medium-long duration), Type III (medium erosivity, medium intensity, medium duration), Type IV (medium-high erosivity, medium-high intensity, medium-short duration), and Type V (strong erosivity, high intensity, short duration).. Among these, Type III rainfall was identified as the primary rainfall pattern causing slope soil erosion, with runoff and sediment yields being 1.2-6.4 times and 2.7-19.4 times higher than the other four types. Narrow-terrace cultivation and platform planting exhibited optimal runoff reduction effects under light (Types I-II) and heavy (Types IV-V) rainfall patterns, respectively. [Conclusion] This was primarily because terraces effectively intercepted runoff sediment from low-intensity, small-volume rainfall, whereas under high-volume and high-intensity rainfall, terraces tended to become saturated, and platform fields were more effective in intercepting runoff sediment. Furthermore, the grass strips in forested areas demonstrated optimal runoff reduction effect under Type I rainfall pattern, primarily because the vegetation effectively slowed runoff velocity, enhanced infiltration, and facilitated sediment deposition. These findings provide a basis for further clarifying the relationship between rainfall and runoff sediment in purple soil regions.
purple soil / rainfall pattern / runoff and sediment yield / soil and water conservation measures / runoff plot
| [1] |
|
| [2] |
|
| [3] |
陈洋, 张海东, 于东升, 等. 南方红壤区植被结构类型与降雨模式对林下水土流失的影响[J]. 农业工程学报, 2020, 36(5): 150-157.
(
|
| [4] |
To evaluate the long-term effects of reforestation types on soil erosion on degraded land, vegetation and soil properties under conventional sloping farmland (CSF) and three different reforestation types including a Pinus massoniana secondary forest (PSF), an Eucommia ulmoides artificial economic forest (EEF) and a natural succession type forest (NST), were investigated at runoff plot scale over a six-year period in a red soil region of southern China. One hundred and thirty erosive rainfall events generating runoff in plots were grouped into four rainfall types by means of K-mean clustering method. Erosive rainfall type I is the dominant rainfall type. The amount of runoff and the soil loss under erosive rainfall type III were the most, followed by rain-fall type II, IV and I. Compared with CSF treatment, reforestation treatments decreased the average annual runoff depth and the soil loss by 25.5%-61.8% and 93.9%-96.2% during the study period respectively. Meanwhile, runoff depth at PSF and EEF treatments was significantly lower than that in NST treatment, but no significant difference existed in soil erosion modulus among the three reforestation treatments. This is mainly due to the improved vegetation properties (i.e., vegetation coverage, biomass of above- and below-ground and litter-fall mass) and soil properties (i.e., bulk density, total porosity, infiltration rate and organic carbon content) in the three reforestation treatments compared to CSF treatment. The PSF and EEF are recommended as the preferred reforestation types to control runoff and soil erosion in the red soil region of southern China, with the NST potentially being used as an important supplement.
|
| [5] |
|
| [6] |
|
| [7] |
秦伟, 左长清, 晏清洪, 等. 红壤裸露坡地次降雨土壤侵蚀规律[J]. 农业工程学报, 2015, 31(2):124-132.
(
|
| [8] |
|
| [9] |
邬铃莉, 王云琦, 王晨沣, 等. 降雨类型对北方土石山区坡面土壤侵蚀的影响[J]. 农业工程学报, 2017, 33(24):157-164.
(
|
| [10] |
张黎明, 于东升, 史学正, 等. 不同降雨类型下的南方典型土壤侵蚀量差异研究[J]. 水土保持通报, 2011, 31(4): 1-6.
(
|
| [11] |
任雨之, 郑江坤, 付滟, 等. 不同耕种模式下遂宁组紫色土坡耕地产流产沙特征[J]. 水土保持学报, 2019, 33(2):30-38.
(
|
| [12] |
马星, 郑江坤, 王文武, 等. 不同雨型下紫色土区坡耕地产流产沙特征[J]. 水土保持学报, 2017, 31(2): 17-21.
(
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
何晓群. 多元统计分析[M]. 2版. 北京: 中国人民大学出版社, 2008.
(
|
| [18] |
彭浩, 李忠武, 刘春, 等. 湘中低山丘陵区坡面产流输沙对降雨、土壤类型及水保措施的综合响应特征[J]. 水土保持学报, 2019, 33(2):60-67.
(
|
| [19] |
曹媛, 孙鹏, 姚蕊, 等. 不同雨强条件下工程措施对坡地产流产沙影响[J]. 水土保持学报, 2020, 34(6):1-7.
(
|
| [20] |
甘凤玲, 苟俊菲, 刘春红, 等. 草带宽度对紫色土坡面细沟形态及水土流失特征的影响[J]. 水土保持学报, 2022, 36(2):25-32.
(
|
/
| 〈 |
|
〉 |
