盐胁迫对草坪草金属离子吸收及分配的影响

研究了3种暖季型草坪草在土壤盐分胁迫时,根、茎、叶中5种金属离子含量的变化。结果表明:3种暖季型草坪草根、茎、叶的Na 含量均随盐分胁迫的加重而上升。同一处理,假俭草中的Na 含量高于结缕草和沟叶结缕草;2~6 g/kg NaCl浓度处理下,结缕草与沟叶结缕草的Na 含量差异不明显;8 g/kg NaCl处理时,结缕草的Na 含量高于沟叶结缕草。结缕草和沟叶结缕草受到盐分胁迫时,能维持较高的K 含量,这可能是耐盐性较强的原因之一,而假俭草在盐分胁迫下K 浓度下降,抗盐能力较差。因此,可以K 含量、Na 含量、Fe3 含量、K 与Na 含量比、RS(K ,Na )等指标的变化趋势来衡量草坪草的耐盐性能。此次试验中,抗盐性最强的是沟叶结缕草,其次是结缕草,假俭草抗盐能力最弱。

Effects of Soil Salt Stress on the Metal Ions Absorption and Distribution in Three Warm-season Turfgrasses

The contents of 5 metal ions in root,shoot and leaf of three warm-season turfgrasses in soil salt stress were studied.The results showed that with salt stress aggrevating,content of Na~ increased in root,leaf and shoot,and the proportion of Na~ in shoot and leaf increased remarkably.Under the same concentration of salt stress,the content of Na~ of Centipedegrass was higher than those of Zoysiagrass and Manilagrass.The difference of Na~ concentration between Zoysiagrass and Manilagrass was unremarkable with low concentration of salt treatment,but under 0.8% salt treatment,the content of Na~ in Zoysiagrass was higher than that in Manilagrass.Keeping high K~ concentration could be one way to get high salt tolerance of Zoysiagrass and Manilagrass,while Centipedegrass declined in its salt tolerance with the K~ concentration decreased under salt stress,and its salt tolerance was poor.Fe~(3 ) concentration and RS_((K~ ,Na~ )) changed trend could be used to estimate the turfgrass salt tolerance.