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Tillage-induced microtopography alters time-dependent intrinsic correlation of runoff and sediment yield
Soil and Tillage Research ( IF 6.5 ) Pub Date : 2022-05-04 , DOI: 10.1016/j.still.2022.105423
Jian Luo , Nana Wang , Zicheng Zheng , Tingxuan Li , Shuqin He , Paolo Tarolli

Tillage practices change microtopography and hydrological process, which significantly affects soil erosion. The objective of this study is understanding storm-driven microtopography development under different tillage practices and its effects on runoff and soil erosion. A series of simulated rainfall experiments with an intensity of 2.0 mm min−1 were implemented on three 4 m by 0.8 m soil boxes on a 15° slope with different tillage-induced microreliefs including smooth slope (SS), artificial digging (AD), and ridge tillage (RT). The Hilbert-Huang transform (HHT) was used to detect the change trends of runoff and sediment yield, and the time-dependent intrinsic correlation (TDIC) was used to depict intrinsic runoff-sediment relations. The results showed the soil roughness were SS < AD < RT during different rill erosive stages. AD and RT slopes reduced runoff by 11.5–64.5% compared with the SS slope during water erosion. AD and RT slopes also reduced sediment yield by 13.3–83.4% during interrill erosion process, but the sediment yield increased by 59.2–132.1% during rill erosion. Runoff and sediment yield had multi-scale temporal variation characteristics. Ensemble empirical mode decomposition (EEMD) was adapted to decompose the runoff and sediment yield data into different intrinsic mode functions (IMFs). For the high-frequency components (IMF1-IMF3), rougher microrelief led to increase in the periods of runoff and sediment yield, while the trend of the low-frequency components (IMF4-IMF5) was opposite to that of the high-frequency components. This phenomenon was mainly related to the spatial structure of microtopography. Tillage-induced microtopography altered the associations of runoff with sediment yield in different time scales. This study provided new insights into revealing the mechanism of tillage erosion in sloping farmland.



中文翻译:

耕作引起的微地形改变了径流和产沙量的时间依赖性内在相关性

耕作方式改变了微观地形和水文过程,显着影响了土壤侵蚀。本研究的目的是了解不同耕作方式下风暴驱动的微地形发展及其对径流和土壤侵蚀的影响。一系列强度为 2.0 mm min -1的模拟降雨实验在 15° 坡度上的三个 4 m x 0.8 m 土壤箱上实施了不同的耕作引起的微起伏,包括平滑坡度 (SS)、人工挖掘 (AD) 和垄作 (RT)。采用希尔伯特-黄变换(HHT)检测径流量和产沙量的变化趋势,采用时变内在相关性(TDIC)刻画内在的径沙关系。结果表明,不同细沟侵蚀阶段的土壤粗糙度为SS < AD < RT。与 SS 斜坡相比,AD 和 RT 斜坡在水蚀期间减少了 11.5-64.5% 的径流。AD和RT斜坡在细沟侵蚀过程中也减少了13.3-83.4%的产沙量,但在细沟侵蚀过程中产沙量增加了59.2-132.1%。产流产沙具有多尺度时间变化特征。集合经验模态分解 (EEMD) 适用于将径流和产沙量数据分解为不同的固有模态函数 (IMF)。对于高频分量(IMF1-IMF3),较粗的微起伏导致产流产沙周期增加,而低频分量(IMF4-IMF5)的趋势与高频分量相反. 这种现象主要与微地形的空间结构有关。耕作引起的微地形改变了径流与不同时间尺度下产沙量的关联。该研究为揭示坡耕地耕作侵蚀机制提供了新的见解。对于高频分量(IMF1-IMF3),较粗的微起伏导致产流产沙周期增加,而低频分量(IMF4-IMF5)的趋势与高频分量相反. 这种现象主要与微地形的空间结构有关。耕作引起的微地形改变了径流与不同时间尺度下产沙量的关联。该研究为揭示坡耕地耕作侵蚀机制提供了新的见解。对于高频分量(IMF1-IMF3),较粗的微起伏导致产流产沙周期增加,而低频分量(IMF4-IMF5)的趋势与高频分量相反. 这种现象主要与微地形的空间结构有关。耕作引起的微地形改变了径流与不同时间尺度下产沙量的关联。该研究为揭示坡耕地耕作侵蚀机制提供了新的见解。耕作引起的微地形改变了径流与不同时间尺度下产沙量的关联。该研究为揭示坡耕地耕作侵蚀机制提供了新的见解。耕作引起的微地形改变了径流与不同时间尺度下产沙量的关联。该研究为揭示坡耕地耕作侵蚀机制提供了新的见解。

更新日期:2022-05-06
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