Temporal and Spatial Variation of Erosion Gullies in Kebai Black Soil Region of Heilongjiang during the Past 50 Years
黑龙江克拜黑土区50多年来侵蚀沟时空变化

The black soil resource of China is famous for its fertility, high organic content, and the best applicability for cultivation. The long-term human activities of over-reclamation and irrational cultivation resulted in water and soil loss on a large scale. Especially the erosion gullies incise the land surface, nibble the field, wash out the fertile soil and degrade the efficiency of the large cultivator. Erosion gully research is one of the important parts of soil erosion subject. In this paper, based on the Remote Sensing and Geographical Information System, taking Kebai area as a case study, using density of erosion gully as the main indicator, the authors analyzed the dynamic change of the erosion gully density, the variation of the erosion gully on different altitudes, slopes and aspects, as well as the variation in different morphogenetic regions, and finally revealed the rule of temporal and spatial variations of erosion gullies in recent 50 years in typical black soil area of Northeast China.