酸性和碱性土壤中绣球花对镉的耐性响应及积累转运特征

Tolerance Response, Cadmium Accumulation and Translocation Characteristics of Hydrangea macrophylla in Acidic and Alkaline Soils

摘要: 为探讨绣球花(Hydrangea macrophylla)在镉(Cd)污染土壤生态绿化与根部滞留型稳定化修复中的应用潜力，本研究通过盆栽试验，比较了其在酸性和碱性土壤条件下的Cd耐性响应及积累转运特征。结果表明，绣球花在两类土壤中均具有一定Cd耐受能力；在相同Cd处理下，碱性土壤Cd有效性低于酸性土壤，植株生长和生物量积累整体较好。Cd主要富集于根部，转移系数为0.03~0.05，表现出明显的根部滞留特征。本研究结果反映了酸性和碱性土壤条件及其伴随养分背景下绣球花对Cd胁迫的综合响应。综上，绣球花具有作为Cd污染土壤生态绿化和根部滞留型稳定化修复候选植物的潜力。

Abstract: To investigate the application potential of Hydrangea macrophylla in ecological greening and root-retention-based stabilization remediation of cadmium (Cd)-contaminated soils, a pot experiment was conducted to compare its Cd tolerance responses and accumulation-translocation characteristics under acidic and alkaline soil conditions. The results showed that H. macrophylla exhibited a certain degree of Cd tolerance in both soil types. Under the same Cd treatments, Cd availability in alkaline soil was lower than that in acidic soil, and plant growth and biomass accumulation were generally better in alkaline soil. Cd was mainly accumulated in the roots, with translocation factors ranging from 0.03 to 0.05, indicating a pronounced root-retention characteristic. These results reflect the integrated responses of H. macrophylla to Cd stress under acidic and alkaline soil conditions, together with their associated nutrient backgrounds. Overall, H. macrophylla has potential as a candidate plant for ecological greening and root-retention-based stabilization remediation of Cd-contaminated soils.