| 摘要: |
| 【目的】阐明镉处理下不同种群青杨镉富集能力的变异特征，为利用青杨进行重金属土壤修复提供参考。【方法】以自然分布于川西地区的榆林（YL）、日隆（RL）和牦牛沟（MN）3个自然种群青杨插条为材料，通过盆栽方式，对其进行0（CK），5(L)和10(H) mg/kg镉处理，测定不同处理青杨插条根、茎、叶中的镉含量，生物量及地径和树高，分析不同种群青杨的富集能力差异，并利用巢式方差分析方法，比较镉含量变异在种群和无性系间的分量比例。【结果】2个镉处理下青杨生长无明显变化，3个种群平均镉含量为3.36~45.01 mg/kg，集中分布在10~20 mg/kg，其中日隆和榆林种群镉含量大于牦牛沟种群。地上部分（茎和叶）镉富集大于地下部分，具有较强的转运能力，但其在种群之间存在一定的差异。各器官中的镉含量在种群间和无性系间都存在明显差异，其中根和叶中的镉含量变异主要来源于种群间（占65.4％~68.9％和50.3%~71.2%），而茎主要来源于无性系间（H处理）或者相近（L处理）。无性系间的变异性就器官而言，以叶最大，其无性系的最大值、极差和变异系数分别达到61.26，58.22 mg/kg和0.58；就种群而言以榆林种群的变异性最大，日隆种群次之，牦牛沟种群最小。【结论】青杨具有较好的重金属镉富集能力，且种群间和无性系间都存在明显变异性。 |
| 关键词: 土壤镉污染 青杨 植物修复 种群变异 |
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| 基金项目:国家自然科学基金项目（31400555） |
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| Variance characteristics of cadmium enrichment ability among different Populus cathayana populations |
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WEI Tong,HU Xizhi,HUANG Xiong,et al
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| Abstract: |
| 【Objective】This study explored the variance of cadmium enrichment ability among different populations of Populus cathayana under cadmium (Cd) treatments to provide basis for restoring heavy metal contaminated soil.【Method】Cuttings of P.cathayana collected from three natural distributed populations in Yulin (YL),Rilong (RL) and Maoniugou (MN) in western Sichuan were used to conduct pot experiment under three treatments (0,5(L) and 10(H) mg/kg Cd).Tree height,basal diameter and Cd contents in root, shoot and leaf were measured to analyze the variance of Cd enrichment among populations,and the nested ANOVA was used to differentiate the proportions of Cd content variance among populations and clones.【Result】The growths of P.cathayana from different populations were not significantly affected by two Cd treatments.Cd contents of P.cathayana were 3.36-45.01 mg/kg and mainly 10-20 mg/kg with higher values in RL and YL populations than MN population.Cd enrichment in aboveground parts (stem and leaf) was higher than in underground parts,suggesting strong mobility,and there were differences among populations.The Cd contents in different organs had significant differences among populations and clones.The content variance of root and leaf was mainly from populations (accounting for 65.4％-68.9％ and 50.3%-71.2%,respectively),while that of shoot was mainly from clones (H) or it was close (L).The leaf had the biggest variance,with the maximum in clone,the total range and the total coefficient of variation (CV) of 61.26,58.22 mg/kg and 0.58,respectively.YL population had the biggest variance,followed by RL and MN. 【Conclusion】P.cathayana had a good ability of Cd enrichment,and there was considerable variance among populations and clones. |
| Key words: soil cadmium pollution Populus cathayana phytoremediation population variance |
