Pb2＋／Cr3＋污染对银叶真藓、小扭口藓叶绿素含量的影响

目的]研究 Pb2＋/Cr3＋浓度对银叶真藓和小扭口藓叶绿素含量的影响。方法]以银叶真藓与小扭口藓为材料，用不同浓度的硝酸铅溶液或氯化铬溶液进行培养，研究它们在重金属铅、铬单一胁迫下光合色素含量的变化。结果]同一 Pb2＋浓度，除了在100 mg/L浓度外，其他浓度对于小扭口藓的影响均大于银叶真藓；在同一 Cr3＋浓度，除了在10 mg/L这一浓度外，对于银叶真藓的影响均大于小扭口藓。不同浓度的 Pb2＋、 Cr3＋处理均导致银叶真藓及小扭口藓的总叶绿素含量较其空白对照组降低。小扭口藓对于 Pb2＋污染的耐受力不及银叶真藓，而对于 Cr3＋污染较银叶真藓大。结论]基于对作为苔藓植物监测材料在量上及多毛分枝物点上的常规要求，可以选用小扭口藓作为郑州市区大气重金属污染监测指示物种。

Effects of Lead/Chromium Stress on Contents of Chlorophyll in Bryum argenteum and Barbula indica

Objective] This study aimed to clarify the effects of Pb2＋ and Cr3＋ stress on the contents of chlorophyl in Bryum argenteum and Barbula indica. Method] B. ar-genteum and B. indica were cultured in different concentrations of lead nitrate solu-tion or chromium chloride solution, to investigate the changes in contents of photo-synthetic pigments under lead and chromium single stress. Result] The results showed that the effects of 1, 10 and 200 mg/L Pb2＋ on B. indica were greater than those on B. argenteum; the effects of 1, 50, 100 and 200 mg/L Cr3＋ on B. argen-teum were greater than those on B. indica. Total chlorophyl content in B. argen-teum and B. indica under different concentrations of Pb2＋ and Cr3＋ was decreased compared with that in control. The tolerance of B. indica to Pb2＋ pol ution was lower than that of B. argenteum, while the tolerance of B. indica to Cr3＋ pol ution was greater than that of B. argenteum. Conclusion] Based on the conventional require-ments for monitoring materials, B. indica can be used as an indicator species to monitor heavy metal pol ution in the atmosphere of Zhengzhou.