复合重金属胁迫对高羊茅生长发育的影响

草坪植物作为重要的园林地被植物,在园林绿化中应用广泛,目前是应用面积最大的一类草本植物,同时,草本植物通常是水土保持及恢复的先锋植物。为使重金属污染区得到有效治理,选取高羊茅(Festuca arundinacea Schreb.)作为研究对象,在重金属胁迫下进行栽培试验,对地上部分的生物量以及叶片叶绿素含量进行研究。结果表明:随着处理浓度的升高镉单一胁迫和复合胁迫对高羊茅地上干重的抑制作用明显,而锌单一胁迫表现为促进作用但效果不明显;所有处理浓度中镉单一胁迫下高羊茅的地上干重都明显小于锌单一胁迫,镉对高羊茅地上干重的影响明显高于锌;复合胁迫中,因浓度的变化镉和锌对高羊茅叶绿素含量和地上干重的作用也发生变化;三种胁迫下都是浓度在50mg·L~(-1)时高羊茅叶绿素含量达到最大值;对于高羊茅叶绿素含量的影响镉、锌复合起到了协同作用。

Combined Heavy Metal Stress Effect on the Growth of Festuca arundinacea Schreb

Turf plant as an important cover plant of garden ,is widely used in landscape at present which is the largest herbaceous plant from the aspect of application area in landscaping .At the same time ,they are pioneer plants in conservation and restoration .In order to governance the heavy metal pollution areas ,taking Festuca arundinacea Schreb .as object ,the cultivation experiments on the biomass above ground was conducted and leaf chlorophyll content under the stress of heavy metal was studied .The results showed that with the increasing of the concentration of cadmium single stress and combined stress had obvious restraining effect of the dry weight on the ground ,and zinc single stress performance for promoting effect ,but the effect is not obvious ;All cad‐mium concentrations of dry weight on the ground under the single stress was smaller than the zinc single stress ,cadmium effects on dry weight on the ground was significantly higher than that of zinc ;In combined stress ,the change of the cadmium and zinc concentration affect the chlorophyll content and dry weight on the ground;Under the three kinds of stress ,concentration at 50 mg·L‐1 ,the chlorophyll of Festuca arundinacea Schreb .reached maximum ;For the effect of chlorophyll content of cadmium and zinc combined stress it had played a synergy .