污染元素镉对能源植物文冠果和荆条生长的影响
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摘要
基于土壤中镉胁迫下温室盆栽文冠果和荆条的个体生长、光合作用和富集特性实验,研究了两种能源植物对镉的富集能力和耐受性。结果显示,1)文冠果茎高、茎粗、生物量等个体生长指标表明其对镉有较高耐受性,但200mg/kg镉浓度处理下,镉对文冠果生长产生严重抑制作用。2)荆条幼苗成活率、生物量等个体生长指标表明其对镉忍耐性不高,5mg/kg浓度处理下,生物量减少了29.02%。3)两种植物镉富集能力不强,镉主要富集在两种植物的根部,均不属于镉超富集植物。本论文研究为基于能源植物修复镉污染土壤提供了理论参考。
The individual growth, photosynthesis and Cd accumulation characteristics of Shinyleaf Yellowhorn and Heterophyllous Chastetree are studied when the seedlings of the plants grow in greenhouse pots under the stress of Cd in the soil. Based on the pot experiment, the capacity to accumulate Cd and the Cd tolerance of the two energy plants are evaluated. The results show that:1) Shinyleaf Yellowhorn has a high tolerance to Cd as indicated by the change in its height, stem diameter, biomass and so on. However, its growth is inhibited greatly at a Cd density of 200mg/kg.2) The Cd tolerance of Heterophyllous Chastetree is relatively low as indicated by 29.02% in reduction biomass at a Cd density of 50mg/kg.3) The capacity to accumulate Cd of the two plants is limited and Cd is mainly accumulated in their roots. The two plants are both not Cd hyperaccumulators. The study provides a theoretical basis for the planting of energy plants in the Cd-contaminated soil.
The individual growth, photosynthesis and Cd accumulation characteristics of Shinyleaf Yellowhorn and Heterophyllous Chastetree are studied when the seedlings of the plants grow in greenhouse pots under the stress of Cd in the soil. Based on the pot experiment, the capacity to accumulate Cd and the Cd tolerance of the two energy plants are evaluated. The results show that:1) Shinyleaf Yellowhorn has a high tolerance to Cd as indicated by the change in its height, stem diameter, biomass and so on. However, its growth is inhibited greatly at a Cd density of 200mg/kg.2) The Cd tolerance of Heterophyllous Chastetree is relatively low as indicated by 29.02% in reduction biomass at a Cd density of 50mg/kg.3) The capacity to accumulate Cd of the two plants is limited and Cd is mainly accumulated in their roots. The two plants are both not Cd hyperaccumulators. The study provides a theoretical basis for the planting of energy plants in the Cd-contaminated soil.
引文
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