Na2CO3短期胁迫对3种冷季型草坪草幼苗生长及生理特性的影响

Effects of short-term Na2CO3 stress on growthand physiological characteristics ofthree cool season turfgrasses

摘要:

以3种冷季型草坪草多年生黑麦草(Lolium perenne)、高羊茅(Festuca arundinacea)和草地早熟禾(Poa pratensis)为试验材料,采用盆栽法研究了不同浓度Na₂CO₃胁迫(0.0%、0.2%、0.4%、0.6%、0.8%、1.0%)对3种冷季型草坪草生长及生理特性的影响。结果表明:不同浓度Na₂CO₃胁迫下,3种冷季型草坪草草坪外观质量、叶片萎蔫系数、叶片相对含水量、叶绿素含量含量和K⁺含量随着Na₂CO₃浓度的增加而逐渐降低,且浓度越高下降越明显;不同浓度Na₂CO₃胁迫下,3种冷季型草坪草叶片相对电导率、脯氨酸含量、Na⁺含量和丙二醛含量随着Na₂CO₃胁迫浓度的升高呈上升趋势,且浓度越高上升越明显;0.4%~1.0% Na₂CO₃胁迫,降低了3种冷季型草坪草的地上部分、根系干重和根冠比,且随着Na₂CO₃浓度的增加,生长受到胁迫的抑制程度显著增大,根系部分的受抑制程度比地上部分更明显;3种草不适宜生长在Na₂CO₃浓度超过0.4%的生境内,Na₂CO₃浓度大于0.4%时,3种冷季型草坪草已受到明显伤害;多年生黑麦草、高羊茅和草地早熟禾在不同浓度Na₂CO₃胁迫下的隶属函数平均值均表现为草地早熟禾＞高羊茅＞多年生黑麦草,说明草地早熟禾对Na₂CO₃胁迫具有较强的耐受性。

Abstract:

The effects of Na₂CO₃ stress (0.0%,0.2%,0.4%,0.6%,0.8% and 1.0%) on the growth and physiological characteristics of 3 cold season turfgrasses,including ryegrass (Lolium perenne),tall fescue (Festuca arundinacea) and Kentucky bluegrass (Poa pratensis) 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 decreased with increase of Na₂CO₃ concentration.The leaf relative conductivity,proline content,Na⁺ content and malondialdehyde content showed an increasing trend with the increase of Na₂CO₃ concentration.aboveground biomass dry weight of root system and ratio of aboveground biomass to root dry weight of tested turfgrasses were reduced under 0.4% to 1.0% Na₂CO₃ stress,and with the increase of Na₂CO₃ concentration,the inhibition degree on growth increased significantly,especially on roots.3 turfgrasses could not tolerate the habitat where the concentration of Na₂CO₃ was over 0.4%.3 turfgrasses were injured when Na₂CO₃ concentration was greater than 0.4%.The average value of subordinate function under different concentrations of Na₂CO₃ stress was Kentucky bluegrass＞tall fescue＞ryegrass,which indicated that the tolerance of Kentucky bluegrass to Na₂CO₃ stress was stronger.