【摘要】 以百慕大‘Tifdwarf’、假俭草、海滨雀稗‘Salam’和结缕草4种暖季型草坪植物为材料,研究了不同盐(NaCl)浓度处理对草坪植物生长和生理的影响。结果表明,海滨雀稗耐盐性最好,海滨雀稗的目测质量、相对生长率、叶片相对含水量、叶绿素指数、光化学效率在600 mmol/L盐浓度处理36 d时分别下降了52.2%,76.2%,62.1%,59.4%和72.9%,相对电导率上升至71.5%,与其他3个草种相比,海滨雀稗各指标仍能维持较高的水平,膜伤害程度相对较小;结缕草耐盐性次之,600 mmol/L盐处理36 d时目测质量、相对生长率、叶片相对含水量、叶绿素指数、光化学效率分别下降了85.2%,85.3%,70.5%,73.9%和49.3%,相对电导率上升至81.8%,表现出较好的耐盐性;耐盐性表现很差的为百慕大和假俭草,在600 mmol/L盐浓度处理36 d时,2种草的各指标皆下降至0,膜伤害程度达到最大,草坪草已枯死。盐处理36 d时,将生长量与盐处理浓度建立回归方程,以生长量下降50%作为耐盐阈值的确定指标,求得4个草种的耐盐阈值分别为为:假俭草222.4 mmol/L,百慕大232.4 mmol/L,结缕草374.8 mmol/L和海滨雀稗474.0 mmol/L。更多还原

【Abstract】 Four warm-season turfgrass species [Bermudagrass ’Tifdwarf’(Cynodon dactylon×C.transadlensis),Centipedegrass(Eremochloa ophiuroides),Seashore Paspalum ’Salam’(Paspalum vaginatum),and Zoysiagrass(Zoysia matrella)] were grown in PVC pots under a series of NaCl concentrations to study the salinity stress responses of turfgrass growth and physiological parameters.Seashore Paspalum showed the best salinity tolerance.The visual quality,relative growth rate,relative water content,chlorophyll index,and Fv/Fm decreased 52.2%,76.2%,62.1%,59.4%,and 72.9%,respectively after 36 d at 600 mmol/L NaCl,but the electrolyte leakage increased to 71.5%.The cell membrane damage in Seashore Paspalum was the lowest of the three species.Zoysiagrass also showed good salinity tolerance,with decreases in visual quality,relative growth rate,relative water content,chlorophyll index,and Fv/Fm of 85.2%,85.3%,70.5%,73.9%,and 49.3%,respectively after 36 d at 600 mmol/L NaCl,and with an increase in electrolyte leakage of 81.8%.Bermudagrass and Centipedegrass showed the lowest salinity tolerance with treatment of 600 mmol/L NaCl and both species were dead after 36 d.The salinity tolerance thresholds of four turfgrass species were determined using linear regression of plant growth rate against NaCl concentration.After 36 d treatment plant growth rate was reduced to 50% of the control.The tolerance thresholds are Centipedegrass 222.4 mmol/L,Bermudagrass 232.4 mmol/L,Zoysiagrass 374.8 mmol/L,and Seashore paspalum 474.0 mmol/L.更多还原