Study On The Influence Of Furrow On The Slope Farmland Runoff Of Luan River

Slope farmland is one of the important agricultural land resources in China.The uneven time and space distribution of water resources brought by the monsoon climate in China makes the water and soil resources on the sloping lands unmatched,and it is also compatible with the soil erosion,drought and water shortage on the sloping lands These and other issues jointly restrict the development speed of China's agricultural production.Ridge furrow farming on slope farmland is one of the main measures to achieve efficient use of water resources in slope farmland.Ridge furrow farming can also alleviate environmental problems such as soil erosion and non-point source pollution on slope farmland.It is an important measure to achieve the balance of water and soil resources on slope farmland.As a key link of water and soil loss and non-point source pollution,it is of practical significance to clarify the law and mechanism of water and soil loss and non-point source pollution on sloping farmland.This paper takes the upper Luan River as the research area,adopts the method of slope hydrological prototype test,selects a representative location in the research area and lays out the test field,starting from the ditch layout parameters(ditch direction,ridge spacing),different combinations of ditch layout parameters are laid out 10 fields,monitoring rainfall process,runoff process,soil moisture content,crop physiological parameters on the field.Identify the influence of the ditch layout specifications on the soil moisture content and rainfall runoff of the field,and comprehensively optimize the ditch layout specifications based on the rainfall runoff process combined with soil moisture,crop yield,crop physiological characteristics and other factors.The main results are as follows:(1)The effect of ditch layout on soil moisture content of slope farmland.The soil moisture content of slope farmland in the upper reaches of Luan River increases first and then decreases with depth,and reaches the maximum at 40-60 cm soil layer depth.And as the depth increases,the fluctuation of soil moisture content is smaller.Under the condition of horizontal ridge cultivation,it can effectively increase the soil moisture content of the soil layer at a depth of 40-60 cm,and increase the soil moisture content of the cultivated layer of the main crops in the Luan River Basin.(2)The impact of furrow layout on slope runoff under different rainfall scenarios.Horizontal ridge farming can obviously weaken the rainfall runoff phenomenon below the rainstorm level,and the runoff flow increases with the increase of the ridge spacing.However,under different ridge and furrow trends,the effect of ridge spacing on the runoff flow is different.(3)Optimize the layout specifications of furrows for the efficient use of water resources.According to the analysis results of experimental data,based on the comprehensive analysis of rainfall runoff process combined with soil moisture,crop yield,crop physiological characteristics and other factors to optimize the layout specifications of the ditch,the most suitable ditch layout specification for the slope farmland in the Luan River basin is the horizontal Tilling 40 cm ditch spacing.This research can further enrich the theoretical system of rainfall and runoff processes on slope farmland,and provide theoretical support for the optimization and adjustment of slope farmland farming modes in the upper reaches of Luan River,which has important theoretical significance and practical application value.