Cu^(2+)与Zn^(2+)递进胁迫下高羊茅的初期生长效应及生态阈限研究(英文)

Initial Growth Effect and Ecological Threshold of Festuca arundinacea L.Under Progressive Stress of Cu^(2+) and Zn^(2+)

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。

Initial growth effect and ecological threshold of F.arundinacea under progressive stress of heavy metal Cu 2+ and Zn 2+ were investigated. The results showed that under progressive stress of Cu 2+ and Zn 2+ , the growth of F.arundinacea was inhibited by different degrees in each treated concentration, and the inhibiting effect increased as increase of heavy metal concentration. The most significantly negative linear correlation was run between each index determined and stress concentration( C ), and all coefficients reached the most significant level( r >-0.9000 ** ). For Cu 2+ stress, the correlated coefficients of RIH and C,SLP and C,URP and C, PNP and C were -0.9162 ** , -0.9724 ** ,-0.9597 ** and -0.9582 ** respectively. With Zn 2+ stress, coefficients of RIH and C,SLP and C,URP and C, PNP and C were -0.9680 ** , -0.9543 ** ,-0.8876 ** and -0.8967 ** respectively. Through analyzing synthetical effect of growth, the negative effect of Cu 2+ was greater than that of Zn 2+ . Analysis on enrichment situation used ICP-AES method. The results showed that along with increase of Cu 2+ and Zn 2+ stress concentration, their contents in roots and stem-leaf all increased. The enrichment coefficients of roots to Cu 2+ and Zn 2+ were all obviously larger than that of stem-leaf. Seen from analysis on green degree of turfgrass, under Cu 2+ and Zn 2+ stress of the experimental conditions, obvious change of green degree didn't appear.