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采用砂培法,研究了匍茎翦股颖对Cu2+、Zn2+、Cd2+与Pb2+胁迫的生长响应及阈限浓度,结果表明:种子萌发率随着4种重金属浓度的增加而下降。对株高的影响是当重金属浓度小于100mg/L时会促进株高生长,高于100mg/L则产生抑制作用。Cu2+显著抑制根系生长,并随浓度的增加抑制效应愈加显著;在Cu2+浓度为600mg/L时匍茎翦股颖的根长比对照下降了93.75%。Cu2+、Zn2+、Pb2+浓度小于200mg/L时会促进地上生物量的增加,但高于200mg/L时,地上生物量会随着3种重金属的增加而减少。Cu2+、Zn2+浓度小于100mg/L或Cd2+、Pb2+浓度小于200mg/L会增加叶绿素的含量,高浓度会降低叶绿素的含量;Cd2+在浓度为600mg/L时显著降低叶绿素含量,与对照相比,下降了43.55%。匍茎翦股颖生长的综合效应分析表明,匍茎翦股颖对Cu2+胁迫最敏感,具有较低的阈限浓度,而Zn2+胁迫对匍茎翦股颖的生长影响最小,阈限浓度相对较高。
The sand culture method was used to study the growth response and threshold concentration of Cunninghamia lanceolata to Cu2 +, Zn2 +, Cd2 + and Pb2 + stress. The results showed that the seed germination rate decreased with the increase of four heavy metals. The effect on plant height is that when the concentration of heavy metals is less than 100mg / L, it will promote the growth of plant height, and the inhibition will occur when the concentration is higher than 100mg / L. Cu2 + significantly inhibited the root growth, and the inhibitory effect was more pronounced with the increase of the concentration. The root length of the stalk was 93.75% lower than that of the control when the concentration of Cu2 + was 600mg / L. When Cu2 +, Zn2 + and Pb2 + concentrations were less than 200 mg / L, aboveground biomass was increased, but above 200 mg / L, aboveground biomass decreased with the increase of three heavy metals. The concentration of Cu2 + and Zn2 + was less than 100mg / L or Cd2 +, while the concentration of Pb2 + was less than 200mg / L, chlorophyll content would be increased and chlorophyll content would be decreased under high concentration. Cd2 + decreased significantly at 600mg / L, 43.55%. The results of the comprehensive effects on the growth of Cunninghamia lanceolata showed that Cunninghamia lanceolata was the most sensitive to Cu2 + stress and had the lower threshold concentration, whereas the Zn2 + stress had the least effect on the growth of Crested Civet. The threshold concentration was relatively high.