<正>阐述了江苏省森林资源一环境一经济复合系统（FEES）可持续发展的原理，分析了江苏省FEES的基本结构及各要素之间的关联。应用改进的解释结构建模方法（ISM）建立江苏省FEES的结构模型，使得FEES各要素之间的层次更为分明。

The effects of silicon on ion micro-distribution status of root tips in Ziziphus jujuba cv. Jinsixiaozao under salt stress were studied with X-ray electron probe mieroanalysis. The results showed that the peak of Na+and C1-in the cells of the epidermis, cortex and stele under 0.3% NaC1 stress was higher while that of K+was lower. However, after the addition of silicon (0.4 g/kg) to the stressed plants, the contents of Na+and C1-in those cells decreased remarkably while that of K+increased significantly. Moreover, Na+and C1-were distributed uniformly in all tissues of roots. It indicated that the addition of silicon under salt stress ameliorated the ion imbibtion and the ion micro-distribution status, therefore, it alleviated the toxic effects from salt ions.