Initial Growth Effect and Ecological Threshold of Festuca arundinacea L.Under Progressive Stress of Cu2+ and Zn2+
Cu2+与Zn2+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 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.