Comprehensive evaluation of heat tolerance of four groundcovering plants by subordinate function values analysis

The hightemperature tolerance index of four ground covering plants under different heat stress was studied. Through measuring physiological hightemperature tolerance characteristics such as relative permeability of plasma membrane, content of MDA ,SOD and POD activity, proline, chlorophyll, soluble sugar and soluble protein content; and a comprehensive evaluation on hightemperature tolerance of different species of four ground covering plants was given based on subordinate function values analysis. The results indicated that the order of hightemperature resistance from high to low was : Lyaimachia alfredii and L.christinae var. huayeL.congestiflora and L.nummularia Aurea, this accorded with their practical performance. Fuzzy subordination method could be used to analyze the hightemperature tolerance completely and avoid the shortage of single index.