水土保持先锋植物类芦对酸铝胁迫的响应

Effects of acidity and aluminum stress on the growth of Neyraudia reynaudiana

通过营养液培养试验,研究了不同pH值和不同浓度铝(Al)对水土保持先锋植物类芦(Neyraudia reynaudiana)生长的影响。结果表明,pH为2.5的极强酸性条件或很高的Al浓度(≥3000μmol·L^(-1))条件均会显著抑制类芦的生长,在pH 3.5和4.5条件下,Al浓度≤1000μmol·L^(-1)对类芦生长无显著抑制作用。pH为4.5的条件比pH为6.15的条件更有利于类芦的生长。除pH为2.5的极强酸性环境会显著抑制类芦对氮、磷和钾的吸收外,其他试验条件对类芦吸收氮、磷和钾的影响较小或没有影响,说明类芦在酸铝胁迫下对氮、磷和钾有高效利用的能力。总之,类芦对酸铝胁迫有较强的耐受能力,在酸性土壤和酸性矿区植被恢复中具有较大的应用潜力。

A hydroponic experiment was conducted to evaluate the effects of different pH levels and aluminum(Al)concentrations on the growth of Neyraudia reynaudiana growth,which is a pioneer plant for soil and water conservation.The results indicated that the growth of Neyraudia reynaudiana was inhibited significantly under the condition of pH 2.5 and high Al concentration(≥3000μmol·L-1)(P<0.05).Under the conditions of pH 3.5 and 4.5,an Al concentration of 1000μmol·L-1 or below did not inhibit Neyraudia reynaudiana growth.Neyraudia reynaudiana grew better under the condition of pH 4.5 than that of pH 6.5.The ability of Neyraudia reynaudiana to absorb nitro gen,phosphorus,and potassium was significantly inhibited under the condition of pH 2.5.However,under other experimental conditions,the absorptions of N,P,and K were unaffected by pH level and Al concentration.The results implied that Neyraudia reynaudiana had high use efficiencies for N,P,and K under stresses of acidity and Al.Therefore,it can be concluded that Neyraudia reynaudiana have strong re sistance to the stresses of acidity and Al and is a good species for revegetation in acidic soil regions or mine areas.