Abstract: Through the selection of the indicators highly frequently used in published literatures and by using pressure-state-response (P-S-R) model, an index system based on gridding for assessing the ecological security in Dongjiang River Basin was established. The selected indicators were weighted by entropy method, and then, integrated into the index system for the assessment. The results showed that the ecological security of Dongjiang River Basin was deteriorated from the relativelysecure level in 2000 to the less-secure level in 2004, and then, improved to the rather-secure level in 2008. The selected indicators that were applied to determine the index for assessing ecological security could largely overcome the lack of uniform standard in index system. The ecological security assessment based on gridding could remediate the impact of the changes in administrative boundary, and reflect the spatial differences within the region so as to improve the reliability of the assessment.

Key words: Gleditsia microphylla, NaCl stress, salt injured index, salt tolerance ability.