Relationship between gully erosion and underlying layers

Soil erosion is an important environment disaster in black soil region due to the reclamation in past 50 years. Gullies in black soil region destroy farmland and it is a huge threatens of grain productivity security. This paper adopted Spot5 image to interpret gully distribution of study area in northern Nemoer Basin. Basic topography factors were extracted from SRTM elevation data set. The soil data and stratum data was digitized from papery map. Using spatial overlay analysis module in GIS software, this paper analyzed the relationship between property of underlying layers and gully density distribution. The result shows that soil with high porosity is easily suffered by gully erosion, but the surface property is not the decisive factor of distribution of gully density. In gentle slope region, gully density has significant relationship with K factor. Along with the increment of slope, the correlation coefficient is decreased. Gully density in different stratum layers shows that there are two patters in gully density distribution due to stratum property. One leads to gullies with shallow depth and wide width; the other one leads to deep gullies with narrow width. Single factor of gully erosion can hardly correlate with gully density very well, there is a demand of study of relationship between component factor and gully density.