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通过重金属 Cu2 +、Zn2 +递进胁迫高羊茅初期生长效应及生态阈限的研究 ,结果表明 :在 Cu2 +与 Zn2 +递进胁迫作用下 ,高羊茅生长在各处理浓度均不同程度上受到抑制作用 ,其抑制效应随重金属浓度的增加而增强 ,各项测定指标与胁迫浓度呈极显著负线性关系 ,并各相关系数均达到极显著水平 ( r>-0 .90 0 0 * * ) ;生长综合效应分析比较 ,Cu2 +比 Zn2 +的负向效应为明显。根与茎叶对 Cu2 +与 Zn2 +的富集状况分析采用 ICP-AES法 ,分析结果表明 ,随着重金属 Cu2 +与 Zn2 +胁迫浓度的增加 ,高羊茅根系和茎叶的重金属含量均随之增加 ,根系对 Cu2 +与 Zn2 +的富集系数均明显大于茎叶。从绿度分析看 ,本实验条件下的 Cu2 +与 Zn2 +胁迫 ,均未出现草坪草绿度的明显变化。
The results showed that under the progressive stress of Cu2 + and Zn2 +, the growth of tall fescue at different treatment concentrations were all affected by Cu2 +, Zn2 + The inhibitory effect was enhanced with the increase of heavy metal concentration, and all the measured indicators showed extremely significant negative linear relationship with the stress concentration, and all the correlation coefficients reached the extremely significant level (r> -0.90 0 0 * *) The negative effect of Cu2 + over Zn2 + was obvious when compared with the comprehensive effect analysis. The analysis of the enrichment of Cu2 + and Zn2 + by roots and stems and leaves was carried out by ICP-AES. The results showed that with the increase of Cu2 + and Zn2 + concentrations, the content of heavy metals in roots and stems and leaves The root enrichment coefficients of Cu2 + and Zn2 + were significantly higher than those of stems and leaves. From the analysis of greenness, there was no obvious change of greenness of turfgrass under Cu2 + and Zn2 + stress under the experimental conditions.