PROGRESS IN GEOGRAPHY ›› 2009, Vol. 28 ›› Issue (2): 161-166.doi: 10.11820/dlkxjz.2009.02.001

• Original Articles •     Next Articles

Spatial Similarity between Soil Erosion and Its Influencing Factors Based on Information Entropy Theory

LI Xiuxia, NI Jinren   

  1. Department of Environmental Engineering, Peking University, Beijing 100871, China, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
  • Received:2008-06-01 Revised:2008-12-01 Online:2009-03-25 Published:2009-03-25


Soil erosion, affected by climate, landforms, soil, vegetation and human activities, is an important element influencing the environment. In order to find out the main influencing factors of soil erosion, the related data of the Yellow River Basin is collected, and the spatial similarity between soil erosion and the influencing factors is analyzed based on information entropy theory. It is indicated that, at a scale of 1∶100 000, the order of the factors' importance to soil erosion in the Yellow River Basin is as follows: (1) in the water eroded area weighted precipitation > topographic relief > vegetation coverage > soil type > gully density; (2) in the wind eroded area topographic relief > wind erosion climatic factor > vegetation coverage > soil type > gully density; and (3) in the freezing -thawing eroded area gully density > topographic relief > temperature difference > vegetation coverage > soil type. A quantitative spatial similarity analysis method between the qualitative and quantitative variables is constructed. The main influencing factors for the water eroded area, wind eroded area and freezing-thawing eroded area in the Yellow River Basin are presented. The research result is of great significance to the soil erosion process study and soil conservation in the basin.

Key words: influencing factor, information entropy, soil erosion, spatial similarity, Yellow River Basin