Abstract:Soil salinization is a serious threat to the sustainable development of turfgrass, and breeding and planting salt-tolerant turfgrass can improve and utilize large area of saline soil. The effects of NaHCO3 stress at different concentrations (0, 0.2%, 0.4%, 0.6%, 0.8% and 1.0%) on the physiological and ecological characteristics of three types of cold-season turfgrass, including ryegrass (Lolium perenne L.), tall fescue (Festuca arundinacea L.) and kentucky bluegrass (Poa pratensis L.) were studied by pot experiment. The results showed that the turf quality, leaf wilting score, leaf relative water content, leaf chlorophyll content and K+ content of the three types of cold-season turfgrass decreased with the increasing of NaHCO3 concentration, and the higher the concentration, the more obvious the decrease. Dry weight of aboveground and roots of the three types of cold-season turfgrass reduced under 0.4%~1.0% NaHCO3 stress, and with the increasing of NaHCO3 concentration, the inhibition degree of growth increased significantly, and the inhibition degree of root system was more obvious than that of aboveground parts. The leaf relative conductivity, proline content, malondialdehyde content and Na+ content showed an increasing trend with the increasing of NaHCO3 stress concentration, and the higher the concentration, the more obvious the increase. When NaHCO3 concentration was greater than 0.4%, three types of cold-season turfgrass were damaged. The average value of subordinate function under different concentrations of NaHCO3 stress followed the order of kentucky bluegrass > ryegrass > tall fescue, indicating that the resistance of kentucky bluegrass to NaHCO3 stress was stronger than that of ryegrass and tall fescue.