Study On The Erosion Treatment Effectiveness And Implementation Model Of Red Soils Developed From Two Parent Materials In Hilly Region

The soil erosion has been very serious in the red soil region of South China, The large terrain area, Various types of parent material and serious contradiction between people and land, which has severely restricted the regional ecological environment construction and sustainable economic development. Slope plantation and defective forest erosion,dry slope erosion and hill collapse are the most prominent problem in red soil erosion region. Study the soil erosion control measures, which is important to the protection of regional stability and rapid development of vegetation.This study aim at serious soil erosion for the two parent material red zone, discussion the key technologies of soil erosion, through control measures and comparative analysis of configuration mode, establish an appropriate soil erosion control in local mode to optimize the regional economic and social development to provide technical support. This study selected granite and Quaternary red clay soil, choose effective engineering measures through measurement of runoff and sediment and analysis of soil properties. Field survey of the study area, combined with the experimental results and data analysis, and ultimately proposed the soil and water conservation configuration mode of two parent material red soil region.(1) runoff control factors and parent material on the impact of control measuresRunoff is the main driver of soil erosion, erosion control is to control runoff. Uncontrollable factors including runoff season, rainfall, soil parent material, etc., controllable factors Including topography and vegetation. In this paper, we analysis the different parent materials impact on soil and water conservation control measures, mainly from the engineering measures, tillage measures and plant measures. The results show that the same measures has different treatment effect between the two soil parent material. Granite red zone more than 3/4 of the hilly area with slopes greater than 25°, not suitable for the construction of terraces, fish-scale pit is suitable for granite red soil, but the quaternary red clay is not suitable for fish-scale pit measures; in the conditions of quaternary red clay in the 6°slope, vetiver hedge can reduce the amount of runoff and sediment to 66.8% and 73.4%, in the conditions of granite red zone in the 6°slope, vetiver hedge can reduce the amount of runoff and sediment to 33.9% and 95.9%.(2) soil parent material effect on the engineering measures Quaternary red clay and Granite in the red zone select flat slope, which setting the corresponding engineering measures were observed. Quaternary red clay region, the level trench has better than the foreign soil methods in water and soil conservation effect and can improve soil fertility in some extent. The foreign soil methods with soil C layer in the Compared with the control plot, the soil bulk density with fish-scale pit area reach to 1.29 g·cm-3, reduced 12.2%, organic matter and available P reach to 7.18g/kg and 39.21 mg/kg. Quaternary red clay region has a certain water storage capacity and poor capacity in soil conservation. In the red granite area, bamboo Gullies' treatment has worse effect than fish-scale pits in controlling the loss of soil nutrients and increasing soil water storage capacity, but there are obvious effects.(3) Establishment of optimal allocation model in different red soil regionSoil erosion often occurs in these area:orchard forest, farmland, wasteland, accompanied by severe erosion and damage. Combination of experimental analysis and data summary obtained governance include:Quaternary red clay, governance to erosion of sloping land and orchard understory. Granite Red Zone, governance to erosion of sloping land, orchard understory, collapse post, wasteland. These models is feasible because of combining with the local site conditions and erosion type.