塔克拉玛干沙漠边缘典型固沙植物对多重逆境的适应性OA

The environment at the edge of the Taklamakan Desert is harsh,and the construction of windbreak and sand-fixing forests is in urgent need of scientific allocation of plants with strong stress resistance.Taking 29 typical sand-fixing plant species in this region as research objects,10 physiological indices including leaf water potential,leaf water saturation defi-cit,and superoxide dismutase(SOD)activity were determined.Key stress-resistant indices were screened via principal component analysis,and the membership function method was adopted to comprehensively evaluate the stress resistance of plants with different life forms.The results showed that leaf water potential,leaf water saturation deficit,and superoxide dismutase activity were the key indices for evaluating plant adaptability to adverse environments.Among arbor species,Populus euphratica,Populus pruinosa,Elaeagnus moorcroftii,and Xanthoceras sorbifolium exhibited the strongest stress re-sistance,with the mean membership function values ranging from 0.52 to 0.60.Among shrub species,Haloxylon ammoden-dron,Halostachys caspica,Calligonum mongolicum,Nitraria roborowskii,and Atriplex canescens had the optimal stress re-sistance,with the mean membership function values between 0.51 and 0.60.Among herbaceous species,Phragmites aust-ralis,Zygophyllum fabago,and Pennisetum giganteum showed the best stress resistance,with the mean membership func-tion values of 0.67-0.76.