柳树种苗修复水体环境镉污染的研究

Study on Phytoremediation of Cadmium Contaminated Water-body by Willow Seedlings in Solution Culture

研究了22个灌木柳无性系和27个乔木柳无性系对水体镉污染的修复能力。在Cd^2＋浓度为5．0mg／kg的营养液培养条件下培养40d，灌木柳无性系单个插穗的叶片镉吸收量为23．19—121．42μg，平均值为77．38μg；枝条镉吸收量为4．77～32，06μg，平均值是14、16μg；根系镉吸收量变动在75．60～155、22μg，平均值为112．27μg；镉吸收总量介于145．92～272．38μg，平均值达203．81μg。乔木柳单个插穗的叶片镉吸收量为30．66—197．20μg，平均值为100．59μg；枝奈镉吸收量在8．90—31．69μg，平均为18．35μg；根系镉吸收量为116．67～541．58μg，平均为296．40μg；镉吸收总量为202．99～664．56μg，平均值为415．34μg。乔木柳的水体镉修复能力强于灌木柳，其中无性系J2151、J1010、J485的表现最为突出。

The phytoremediation of Cadmium （ Cd^2＋ ） contaminated water-body by 22 fruticose willow clones 27 arbor willow clones were studied in this paper. The results showed that Cd^2＋ absorbed by the leaves, branches, and roots of fruticose willow clones was 23.19 ～ 121.42 μg （av. 77.38 μg）, 4.77 - 32.06 μg （av. 14.16μg）, and 75.60 ～ 155.22 μg （av. 112.27 μg） each seeding respectively when the clones were planted in the solution contained 5. 0 mg/L of Cd^2＋ for 40d, and the total Cd^2＋ absorbed per seeding was 145.92 ～ 272.38 μg, with an average of 203.8ling/seeding. While for arbor willow clones, it was 30.66 - 197.20 μg （ av. 100.59 μg）, 8.90 ～ 31.69 μg （ av. 18.35 μg）, and 116.67 ～ 541.58 μg （ av. 296.40 μg） respectively, and the totally was 202.99 - 664.56 μg, with an average of 415.34 μg/seeding. Basically the phytoremediation abilities of arbor willow clones were greater than that of fruticose willow clones, and among which clone J2151, J1010 and J485 was the best.