Zn胁迫对香樟幼苗生长的影响

Effect of Zn on the growth of Cinnamomum camphora

探讨重金属元素Zn对香樟(Cinnamomum camphora)地茎、苗高、根长和根数等的影响,旨在为重金属土壤中香樟的种植提供基础。本文采用营养钵方法进行培育香樟,根据香樟的生长进行重金属溶液的灌溉。试验设定6个不同的重金属Zn浓度,分别为0、100、300、500、700、900mg/L。培育结束测定幼苗地上部及地下部指标。结果表明Zn处理对香樟的地茎有显著促进的作用,500、700mg/L的Zn处理下,香樟的地茎最粗,比对照提高了27%。Zn处理对香樟苗高有抑制作用,浓度越高,苗高越矮。Zn处理下根长也表现为相对对照减少的趋势,减少幅度高达50%。低浓度的Zn处理对香樟根数有促进的作用,随着浓度增加则出现减少的情况。随着Zn胁迫时间及浓度的增加,脯氨酸含量增加,SOD活性先升高,后降低。可见,重金属Zn对香樟苗高、根长及生理活性有抑制的作用。

Discussion heavy metals Zn on Cinnamomum carnphora stem, seedling height, root length and number of roots, in order to provide a basis for planting camphor in heavy metals soil. This article adopted the method of cultivate nutrition pot camphor, heavy metal solution irrigated based on the growth of Cinnamomum camphora. The test set of four different Zn concentration, were 0,100,300,500,700 mg/L. In the End of the test, measured the seedling shoot and underground targets. The results show that the Zn treatment had a significant promoting effect on Cinnamomurn camphora stem, 500 and 700 mg/ L of Zn treatment, Cinnamomum camphora stem was thickest, than that of the control increased by 27%. Zn treatment has an adverse effect on camphor, the higher the concentration, the lower the height. Zn treatment root length also showed a decreasing trend relative to the control, reduce the rate of up to 50%. Low concentration of Zn can promote the role of the camphor tree root number, as the concentration increased, the number of roots decreased. Thus, the heavy metal Zn had the inhibitory effect on tree seedling height and root.