基于叶片特征的18种盐生植物耐盐性综合评价OA

Soil salinization is a critical barrier to ecological restoration and sustainable development in the arid re-gions of Northwest China.To screen for plant resources suitable for greening saline-alkali lands in this area and then evaluate their efficacy,this study focused on 18 halophyte species from the Karamay Halophyte Botanic Gar-den,and considered Xanthoceras sorbifolium as a control.Twenty physiological and biochemical indicators were systematically measured under salt stress,including leaf water content,leaf thickness,chlorophyll content,antiox-idant enzyme activities,and chlorophyll fluorescence parameters.A comprehensive salt tolerance evaluation sys-tem based on leaf traits was constructed using principal component analysis(PCA)and the membership function method.The results showed significant differences in salt tolerance among the 19 species,with comprehensive evaluation values(D-values)ranging from 0.20 to 0.67.Among the plants tested,Caragana sinica and Suaeda salsa demonstrated the strongest salt tolerance(D=0.67),whereas Xanthoceras sorbifolium was the most sensi-tive(D=0.20).PCA revealed that photosynthetic fluorescence parameters and the antioxidant enzyme system are core indicators that reflect plant salt tolerance.This evaluation system is objective and accurate;the identified su-perior halophytes provide important germplasm resources and have a scientific basis for vegetation restoration,ecological rehabilitation,and landscaping in saline-alkali land of the arid regions of Northwest China.