Cd、Pb胁迫对6种绿化树木生理生化特性的影响
Effects of Cd and Pb Stress on the Physiological and Biochemical Characteristics of Six Greening Trees
【中文摘要】 本试验以河北易县西陵苗圃的2年生的侧柏(Oriental arborvitae)、连翘(Forsythia suspensa)、栾树(Koelreuteria paniculata)、迎春(Jasminum nudiflorum)、红瑞木(Cornus alba)、紫叶小檗(Berberisthunbergiicv atropurpurea )6种常用绿化树种为材料,通过盆栽实验研究了不同浓度Pb、Cd胁迫对各绿化树种根、茎、叶生理生化的影响。主要结果如下:1随着Cd浓度的升高,6种绿化植物根、茎、叶的SOD、POD、CAT活性大体呈现先升高后下降的趋势,而相对电导率则呈一直上升的趋势;5月-9月间随Cd胁迫时间的延长,SOD、POD、CAT活性和相对电导率最大值均呈现逐渐增加的趋势,各树种SOD、POD、CAT活性和相对电导率最大值及增加幅度有所差异,侧柏最大值及增加幅度最小,红瑞木最大;方差分析表明,侧柏抗Cd迫胁能力极显著的大于红瑞木和栾树,连翘显著大于紫叶小檗、迎春,极显著大于红瑞木。栾树和连翘之间的差异不显著,紫叶小檗和迎春之间的差异也不显著,各树种根、茎、叶抗Cd胁迫能力均为侧柏>栾树>连翘>紫叶小檗>迎春>红瑞木。2 Pb胁迫影响下,5月-9月间六种绿化树种根、茎、叶的SOD、POD、CAT活性大体呈现先升高后下降的趋势,而相对电导率则呈一直上升的趋势;随Pb胁迫时间的增加,各树种SOD、POD、CAT活性和相对电导率的最大值也逐渐增加,但各树种SOD、POD、CAT活性和相对电导率最大值及增加幅度不同,侧柏最大值及增加幅度最小,红瑞木最大;各树种不同部位抗Pb胁迫能力也有所差异。方差分析表明:各树种根、茎抗Pb迫胁能力为侧柏>栾树>连翘>紫叶小檗>迎春>红瑞木,侧柏极显著大于红瑞木,栾树和连翘差异不显著,紫叶小檗和迎春差异也不显著;叶部抗Pb迫胁能力为侧柏>连翘>栾树>紫叶小檗>迎春>红瑞木,侧柏极显著大于迎春和红瑞木,连翘极显著大于红瑞木,显著大于迎春,栾树和紫叶小檗没有显著差异。3综合不同浓度Cd、Pb胁迫对六种绿化树种根、茎、叶不同部位SOD、POD、CAT活性和相对电导率的影响,通过隶属函数法计算得出,各绿化树种抗Cd胁迫能力为侧柏>栾树>连翘>紫叶小檗>迎春>红瑞木,抗Pb胁迫能力为侧柏>连翘>栾树>紫叶小檗>迎春>红瑞木。
【英文摘要】 In this pot experiment, six two-year old green trees as Oriental arborvitae, Forsythia suspensa, Koelreuteria paniculata, Jasminum nudiflorum, Cornus alba and Berberisthunbergiicv atropurpurea which got from xiling nursery in yixian county hebei province, were used as the experiment materials, the effects of different heavy metals Pb and Cd concentrations on the physiological and biochemical characteristical of the the green trees roots, caudexes and leaves. The main results were as followings.1 With the rising of the Cd consentration, on the whole the roots, caudexes and leaves SOD, POD, CAT activities of the green trees increased in the beginning and then falled, while the relative conductivity rates increased all the time. The maxes of SOD, POD, CAT activities and the relative conductivitiy rates were all increased with the enhancing of the Cd stress from May to September, there were some differences in the maxes and the enhancement extents of SOD, POD, CAT activities and the relative conductivitiy rates from different green trees, the lowest max and the enhancement extent was Oriental arborvitae and the highest was Cornus alba. Analysis of Variance results showed that the anti Cd stress abilities of Oriental arborvitae is much better than Cornus alba and Koelreuteria paniculata, Forsythia suspensa is better than Berberisthunbergiicv atropurpurea, Jasminum nudiflorum, and much better than Cornus alba. The anti difference ability of Koelreuteria paniculata and Forsythia suspensa are not notibility, also the Berberisthunbergiicv atropurpurea and Jasminum nudiflorum are the same. On the whole the roots, caudexes and leaves anti abilities of the green trees is Oriental arborvitae>Koelreuteria paniculata>Forsythia suspensa>Berberisthunbergiicv atropurpurea>Jasminum nudiflorum>Cornus alba.2 The roots, caudexes and leaves SOD, POD, CAT activaties of the six green trees increased in the beginning and then falled on the whole with the effects of the Pb stress from May to Septemeber, while the relative conduc
