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核农学报  2015 

碱性盐胁迫对3种灌木碳同位素分辨率、光合参数及矿质元素的影响

DOI: 10.11869/j.issn.100-8551.2015.03.0521, PP. 521-527

Keywords: 碱性盐胁迫,灌木,碳同位素分辨率,光合参数,矿质元素

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Abstract:

为了明确3种灌木耐盐碱能力,为盐碱地抗逆性灌木筛选提供优质植物资源。本文通过盆栽试验,比较研究了大洋洲滨藜(Atriplexnummularia)、四翅滨藜(Atriplexcanescens)和宁夏枸杞(LyciumbarbarumL.)3种灌木在不同浓度NaHCO3胁迫条件下生长、碳同位素分辨率(Δ13C)、光合参数和矿质元素含量的变化,为盐碱地优良抗逆性灌木筛选提供必要的理论依据。结果表明,3种灌木随着胁迫浓度的增加,净生长量呈先增后降的趋势,即150mmol·L-1NaHCO3胁迫时,净生长量最高。大洋洲滨藜和四翅滨藜随着胁迫浓度的增加,净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)和气孔限制值(Ls)呈先增加后降低的趋势,胞间CO2浓度(Ci)呈先降低后增加的趋势。宁夏枸杞随着胁迫浓度的升高,Pn、Gs、Tr和Ls降低;3种灌木的碳同位素分辨率△13C在低浓度胁迫时与对照相比升高;3种灌木灰分含量随胁迫浓度的升高均呈下降趋势;四翅滨藜的矿质元素K和Ca含量在低浓度胁迫时与对照相比增加,Na含量与对照相比降低;大洋洲滨藜和枸杞K和Ca含量随着胁迫浓度的升高总体呈下降趋势,Na含量呈升高趋势。3种灌木的△13C分别与WUE、灰分、K和Ca呈正相关关系,大洋洲滨藜和宁夏枸杞的△13C与矿质元素Na呈负相关。由此说明,适度的碱性盐胁迫能够促进大洋洲滨藜和四翅滨藜的的生长,增加其生物量,提高了光合效率。

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