林业科学研究2025，Vol.38Issue(1)：207-215,9.DOI:10.12403/j.1001-1498.20240112
大叶桃花心木对土壤铅镉胁迫的生长响应研究
Growth Response of Swietenia macrophylla to Lead and Cadmium Stress in Soil
摘要
Abstract
[Objective]To investigate the growth response and tolerance of soil lead(Pb)and cadmium(Cd)stresses on Swietenia macrophylla King.[Methods]A pot experiment was conducted to examine root mor-phology,biomass,and Pb and Cd uptake and accumulation under different concentrations of Pb(0,500,1 000,1 500 mg·kg-1)and Cd(0,10,25,50 mg·kg-1).[Results]Under Pb stress,plant height,diameter,root and total biomass of Swietenia macrophylla increased compared to the CK,with the maximum values ob-served at 1 500 mg·kg-1 Pb.In contrast,under Cd stress,the above indexes of Swietenia macrophylla first increased and then decreased,reaching the maximum value at 10 mg·kg-1 Cd.No significant differences in root length,root surface area and root volume were observed between the various Pb and Cd treat-ments and the CK.The nitrogen(N),phosphorus(P),and potassium(K)contents in the roots gradually de-creased as Pb and Cd concentrations increased.Root Pb content and Pb accumulation were significantly higher than those in the aboveground parts in all treatments.For the aboveground biomass,N,P,and K contents did not differ significantly from the CK;however,total N,P,and K accumulation increased with Pb concentration,while with increasing Cd concentration,the trend was first an increase and then a decrease.Pb and Cd content and accumulation in the roots,aboveground parts,and whole plants increased with the rising concentrations of Pb and Cd.[Conclusion]Swietenia macrophylla has strong tolerance to both Pb and Cd stresses,and can be considered as a potential candidate for phytoremediation of Pb-and Cd-con-taminated soil.关键词
铅/镉/重金属污染/植物修复/耐受性Key words
lead/Cadmium/Heavy metal pollution/Phytoremediation/Tolerance分类
农业科技引用本文复制引用
罗志忠,苏立城,肖琳,庄玉婷,郑峰霖,吴道铭,曾曙才..大叶桃花心木对土壤铅镉胁迫的生长响应研究[J].林业科学研究,2025,38(1):207-215,9.基金项目
广东省林业科技创新项目(2022KJCX015) （2022KJCX015）
国家自然科学基金(31971629) （31971629）
