Effects Of Cd And Pb Stress On The Physiological And Biochemical Characteristics Of Six Greening Trees

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 conductivity rates increased all the time. the maxes of SOD, POD, CAT activaties and the relative conductivity rates rose gradually with the enhancing of the Pb stress, but there were differences in the maxes and the enhancement exents in the SOD, POD, CAT activaties and the relative conductivity rates from different green trees, the lowest max and the enhancement extent was Oriental arborvitae and the highest was Cornus alba. There were differences in the anti Pb stress abilities from different parts of the green trees. Analysis of Variance results showed that the roots and caudexes anti Pb stress abilities is Oriental arborvitae>Koelreuteria paniculata>Forsythia suspensa>Berberisthunbergiicv atropurpurea>Jasminum nudiflorum > Cornus alba, Oriental arborvitae is more best 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; and the leaves anti Pb stress abilities is Oriental arborvitae>Forsythia suspensa>Koelreuteria paniculata>Berberisthunbergiicv atropurpurea>Jasminum nudiflorum > Cornus alba. Oriental arborvitae is much better than Cornus alba and Jasminum nudiflorum, Forsythia suspensa is much better than Cornus alba and better than Jasminum nudiflorum, the anti difference ability of Koelreuteria paniculata and Berberisthunbergiicv atropurpurea are not notibility.3 Colligating the effects of different concentrations heavy metals Pb and Cd stress on the roots, caudexes and leaves SOD, POD, CAT activaties and the relative conductivity rates, using the membership function method calculated that the anti Cd stress abilities of the green trees is Oriental arborvitae>Koelreuteria paniculata>Forsythia suspensa > Berberisthunbergiicv atropurpurea > Jasminum nudiflorum >Cornus alba, and the the anti Cd stress abilities of the green trees is Oriental arborvitae>Forsythia suspensa>Koelreuteria paniculata>Berberisthunbergiicv atropurpurea>Jasminum nudiflorum>Cornus alba.