Abstract: Ecological red line refers to the boundary line of the key ecological protection area that has important strategic significance for ecological security and sustainable development. It also is an inevitable choice to achieve national or regional ecological security. According to the importance of ecosystem services and ecological sensitivity evaluation, and in combination with the existing ecological protection areas, the ecological red line in Jiangxi Province was designated. The results showed that the area of ecological red line in Jiangxi Province was 59608.16 km², accounting for 35.71% of the total area of the province. Then we selected the red line regions as sources of ecological security patterns and utilized the minimum cumulative resistance model to build comprehensive ecological security patterns. Therefore, a number of ecological security pattern portions and positions were identified, including ecological corridors among sources, radiating routes, ecologically strategic points and three-level ecological function zones, which corresponded to ecological protection area and proposed construction countermeasures. The low-level ecological land area is 78285.47 km², accounting for 46.89% of the total area of the province. The areas of moderate-level and high-level ecological lands are 49405.89 and 23104.93 km², accounting for 29.59% and 13.84% of the total area of the province, respectively.

Key words: chrysanthemum, Alternaria alternate, cell membrane permeability, toxin, proline.