根生长法测定柳树对重金属的耐性研究

目的]探讨柳树对单一或复合重金属的耐性大小,为木本植物修复重金属污染土壤提供理论依据。方法]采用根生长法研究重金属Cu^2＋、Pb^2＋、Zn^2＋及3者混合液对柳树枝条不定根生长的影响。结果]不同浓度的重金属溶液对柳树枝条不定根的生长存在显著影响。当Cu^2＋浓度高于15 mg/L、混合溶液浓度高于20 mg/L、Zn^2＋浓度高于30 mg/L时,柳树枝条均无不定根生成;溶液浓度达到40mg/L时,只有Pb^2＋处理组能长出不定根;随着溶液浓度的升高,柳树枝条不定根的数目逐渐下降;浓度为5 mg/L的Zn^2＋处理组柳树枝条不定根数目最多。其他浓度中,Pb^2＋处理组不定根数目最多、根长及平均根长最长、生根率最高。结论]柳树枝条对Pb2＋的耐受性最强,对Cu^2＋的耐受性最弱。柳树对3种重金属及3者混合液的耐受性大小依次为：Pb^2＋〉Zn^2＋〉Cu^2＋＋Pb^2＋＋Zn^2＋〉Cu^2＋。

Studies on the Tolerance of Salix matsudana to Heavy Metals Determined by Root Elongation Method

Objective] The research aimed to discuss the tolerance of Salix matsudana to single or compound heavy metals and provide theoretical basis for renovating polluted soil by heavy metals with woody plants.Method] Using root elongation method,the effects of heavy metal Cu2+,Pb2+,Zn2+ and their mixed solution on the adventitious roots' growth of S.matsudana cuttings were studied.Result] The adventitious roots' growth of S.matsudana cuttings was obviously affected by different concentrations of heavy metals so...