Abstract: By using 500 m × 500 m gridding insertion value, the regional distribution of climatic factors in Hunan Province during tobacco growth period was calculated, and, in reference with the Third National Tobacco Regionalization indices and the characteristics of climatic resources and meteorological disasters during tobacco growth period, four climatic factors including precipitation during tobacco growth, sunlight hours during tobacco growth, precipitation at tobacco maturing stage, and ≥ 35 ℃ high temperature damage in 5 consecutive days at tobacco maturing stage were chosen as the indices of tobacco-planting regionalization. By using grading method and GIS-gridding technology, the regionalization of the ecological suitability of climate conditions in tobaccoplanting in this Province was conducted. After superposed land resources information on the climatic regionalization, the tobacco-planting areas which could both satisfy climatic demand and satisfy practically suitable farmland were determined. The results showed that Dongting Lake was not suitable for planting tobacco, while most parts of west, central and south Hunan Province would be the suitable regions. The most suitable regions were concentrated in west Hunan, and the central-south Huaihua and southwest Shaoyang had the greatest potential for tobacco-planting.

Key words: Climbing plants, Vertical virescence, Hedera helix, Parthenocissus quinuefolia, Wisteria sinensis