Abstract: Based on the studies on climate,geomorphology,soil and vegetation, the landscape ecological classification system for the lower Huaihe valley was established. The system included 10 landscape types and 35 landscape subtypes. The landscape type was divided by vegetation (vegetation type or cultivated vegetation type), while landscape subtype was classified according to topography and vegetation (formation group or cultivated vegetation group). Using the soil map (1:1000000) of the region as base map, landscape subtype as mapping unit and several kinds of maps related to the area (landsat images, regetation maps, landuse maps and geomorphological maps), The map of landscape ecological types of the lower Huaihe valley (1:1000000) was compiled. On the map the areas of landscape types and landscape subtypes were measured. The ecological problems of the main landscape types in the lower Huaihe valley were analysed in detail and the corresponding strategies were put forward.

Key words: nitric oxide, tomato, copper stress, ascorbate-glutathione cycle.