Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China.
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China.
Chemosphere. 2017 Aug;181:382-389. doi: 10.1016/j.chemosphere.2017.04.095. Epub 2017 Apr 21.
The effect of decapitation on enhancing plant growth and Cd accumulation in Celosia argentea Linn. was evaluated using a pot experiment. Decapitation significantly enhanced the growth of C. argentea. The numbers of branch and leaf in the decapitated plants (DP) were significantly higher than those in undecapitated plants (UDP, p < 0.05). Decapitation increased the biomass by 75%-105% for roots, 108%-152% for stems, and 80%-107% for leaves. Although the transpiration and photosynthesis rates were not significantly different between DP and UPD, decapitation significantly increased the total leaf area and total transpiration per plant (p < 0.05). The higher total transpiration per plant resulted in a higher leaf Cd concentration in DP. DP accumulated Cd in shoots (197, 275, and 425 μg plant) that were 2.5-2.8 times higher than UDP (78, 108, and 152 μg plant), with the soils containing 1, 5, and 10 mg kg Cd. Results suggested that decapitation is a novel and convenient method to improve the phytoextraction efficiency of C. argentea in Cd contaminated soils.
斩首对银鸡冠花（Celosia argentea Linn.）生长和 Cd 积累的影响采用盆栽实验进行了评估。斩首显著促进了银鸡冠花的生长。斩首植物（DP）的分枝和叶片数明显高于未斩首植物（UDP，p<0.05）。斩首使根系生物量增加了 75%-105%，茎部增加了 108%-152%，叶片增加了 80%-107%。尽管 DP 和 UDP 之间的蒸腾速率和光合速率没有显著差异，但斩首显著增加了每株植物的总叶面积和总蒸腾量（p<0.05）。较高的总蒸腾量导致 DP 中叶片 Cd 浓度较高。DP 在地上部分（275 和 425μg 株）中积累的 Cd 是 UDP（78、108 和 152μg 株）的 2.5-2.8 倍，土壤中 Cd 含量分别为 1、5 和 10mgkg。结果表明，斩首是提高 Cd 污染土壤中银鸡冠花植物修复效率的一种新颖而便捷的方法。
