Abstract: In Tonghua region, 4 climatic and 2 natural geographical factors closely related to poplargrowth, typically representative, and having a distinct temporal and spatial distribution wereselected as statistic indexes. The whole region was divided into 4 climatic sub-regions by clustering analysis, and the cold-resistance grade of poplar was classified on the basis of the investigation on the growth status of 26 poplar strains intreduced in the region. The ecological regionalization of poplar cultivation was dctcrmined by the rclationship of ecological adaptation between poplar strains and natural environment. In addition, the special cases of poplar cultivation in each climatic sub-region were analyzed.

Key words: Tonghua region, Poplar, Cultivating, Ecological regionalization, iron deficiency, sodium nitroprusside, nutrients uptake, antioxidant enzyme, NO₃^- stress, tomato seedlings