Characteristics of Runoff and Sediment Yield in a Simulated Hedgerow–Grass Ditch System in Sloping Lands with Regosols

Lan Song, Yunfei Bi, Qingsong Bo, Tianyang Li, Yonghao Li, Binghui He () and Xinmei Zhao
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Lan Song: College of Resources and Environment, Southwest University, Tiansheng Road, Beibei District, Chongqing 400715, China
Yunfei Bi: College of Resources and Environment, Southwest University, Tiansheng Road, Beibei District, Chongqing 400715, China
Qingsong Bo: College of Resources and Environment, Southwest University, Tiansheng Road, Beibei District, Chongqing 400715, China
Tianyang Li: College of Resources and Environment, Southwest University, Tiansheng Road, Beibei District, Chongqing 400715, China
Yonghao Li: College of Resources and Environment, Southwest University, Tiansheng Road, Beibei District, Chongqing 400715, China
Binghui He: College of Resources and Environment, Southwest University, Tiansheng Road, Beibei District, Chongqing 400715, China
Xinmei Zhao: College of Resources and Environment, Southwest University, Tiansheng Road, Beibei District, Chongqing 400715, China

Land, 2024, vol. 13, issue 8, 1-14

Abstract: The independent effects of hedgerow or grass ditches on the migration of runoff, sediment and nutrients are well known; however, the effects of combined hedgerow–grass ditch systems have rarely been assessed. Vegetation stem diameter (VSD) is an essential variable that changes the effectiveness of a hedgerow–grass ditch system in reducing runoff and sediment yield on sloping lands. A hedgerow–grass ditch system was simulated to interpret the effects of varied VSDs [i.e., 0 (control), 0.1, 0.2, 0.4 and 0.8 cm] in hedgerow on runoff and sediment yield by laboratory rainfall simulation. Compared to the control, the time to runoff initiation presented a 43.3% delay in 0.8 cm VSD ( p < 0.05), and the runoff rate was significantly reduced by 16.6% in the 0.2 cm VSD and by 17.0% in the 0.8 cm VSD, respectively ( p < 0.05). The sediment yield rate decreased by 74.2% and 85.8% relative to that of the control, respectively ( p < 0.05). The reduction was 5.3–17.0% for the runoff rate and 3.5–85.8% for the sediment yield rate with varied VSDs relative to the control. The sediment yield rate decreased remarkably as an exponential function with increased stem diameter ( p < 0.05). Our results have great significance for creating strategies for soil and water conservation on sloping lands.

Keywords: ecological restoration; soil erosion; hedgerow–grass ditch system; rainfall simulation (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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