铅对14种本土草本植物力学特征的影响

Effects of Pb on Mechanical Properties of 14 Native Herbaceous Plants

采用温室盆栽试验,研究了铅对14种本土草本植物力学特性的影响。结果表明,反枝苋、高丹草、紫苑最大拉伸力、最大剪切力、弹性模量、剪切模量均随着铅质量分数的增大而减小,1 500mg/kg铅处理下显著低于对照处理(P<0.05)。藜、绿叶苋、红叶苋和鲁梅克斯K-1杂交酸模最大剪切力、最大拉伸力、弹性模量、剪切模量在各铅处理下均高于对照和其他10种植物,可用于铅严重污染区和环境恶劣区土壤的植被恢复。

Pot experiments in greenhouse were conducted to study the effects of Pb on mechanical properties of 14 native herbaceous plants in different Pb treatments （0, 500, 1 000, 1 500 mg/kg）. The results showed that maxinum tensile loads, maxinum shear loads, elastic modulus of tensile strength and shear modulus of Amaranthus retroflexus, Sorghum bicolor × S. sudanense and Aster tataricus decreased gradually with the increase of Pb content, while the four values under Pb treatment of 1 500 mg/kg were significantly lower compared with control treament. Maxinum tensile loads, maxinum shear loads, elastic modulus of tensile strength and shear modulus of Chenopodium album , Amaranthus tricolor of ‘ green leaf ’ , Amaranthus tricolor of‘ red leaf’ and Rumex patientia× R. tianschanicus cv. Rumex K - 1 under all Pb treatments were all higher than control treatment and other 10 plants, indicating that they could be chosen as remediation plants in Pb-polluted area and bad environment area.