Abstract:

Soil salinization has given severe damage to human beings. In order to improve the grain production and the filed management of moderate-to-low-yield farmland, to prevent the damage of soil salinization getting worse, a risk evaluation index system of soil salinization was proposed in this study.  According to the standard of natural disaster risk principle, this risk evaluation index system was constructed by grey correlation evaluation method based on entropy weight. At last, a risk index calculation model of soil salinization was successfully established. And this model was used to assess the risk of soil salinization in Songyuan irrigation district. The risk value(R) of soil salinization in these regions is between 0.10-0.36, which indicates that the risk is medium or high. The valued places are listed according the risk value from the lower to higher: Qianguo, Anzi, Youzi, Longhai, Shuizi, Dabusu, Qianzi, Taohaotai, Rongzi, Hongxing, Hongzi. The results showed that the risk value obtained by this model is in accordance with the local region's reality. It indicates that the model proposed could be used in the risk assessment of soil salinization.

Key words: disaster science connotation, soil salinization risk, risk assessment, Songyuan irrigation district, field management, grain yield