Effect of soil and water conservation forests on soil erodibility in typical black soil region of China

摘要

Black soil area is one of six water erosion areas in China, where ecological environment is more fragile (Luo et al., 1995). The reasons causing soil erosion were not only the natural factors, but also long -term unreasonable land use and destruction of vegetation ( Li et al., 2006 ). Soil and water conservation forest is an effective biological practice for erosion control. This has been demonstrated in regulating precipitation power distribution to reduce soil erosion, thereby reducing soil loss ( Xu et al., 2006), and in reducing soil erodibility through the formation of litter and soil organic matter to improve soil structure ( Shen et al., 2000). Most of research on soil erodibility was focused on the composition of the soil particles, infiltration characteristics, organic matter content, and soil structure (Zhang et al., 2001), and on micro -aggregate content expressed by the indicators based on dispersion coefficient, dispersion rate, aggregate state (Guo et al., 1992) in Loess Plateau (Jiang,1964; Li et al., 1990). No investigation was reported in Black soil areas (Liao et al., 2008).