| 张福琼,周俊柔,白国杰,任璐瑶,李振辉,卢京,黄晶心.东南景天（Sedum alfredii）在不同光照强度下的重金属积累特征与生理响应[J].农业环境科学学报,2026,45(5):1138-1147. |
| 东南景天（Sedum alfredii）在不同光照强度下的重金属积累特征与生理响应 |
| Characteristics of heavy metal accumulation and physiological responses in Sedum alfredii under different light intensities |
| 投稿时间：2025-06-28 |
| DOI：10.11654/jaes.2025-0608 |
| 中文关键词: 东南景天 光照强度 铅镉污染 植物修复 光合特性 抗氧化酶 |
| 英文关键词: Sedum alfredii light intensity lead and cadmium contamination phytoremediation photosynthetic characteristics antioxidant enzymes |
| 基金项目:国家自然科学基金项目（32360317，32471709）；云南省应用基础研究面上项目（202301AT070077）；云南省国际科技特派员项目（202403AK140052）；云南省2024年大学生创新训练计划项目（202410681047X）；云南师范大学大学生科研训练基金项目（KX2024138） |
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| 中文摘要: |
| 为探究光照强度对东南景天(Sedum alfredii)修复铅镉污染土壤的影响及其生理机制，本实验设置4个光照水平(100、200、300、400 μmol·m-2·s-1)，使用昆明某矿区铅镉污染土壤在室内人工光照系统进行盆栽实验，测定植株生长、光合特性、抗氧化系统及重金属富集特征。结果表明：300 μmol·m-2·s-1光照下，东南景天生物量(地上部13.27 g·株-1)和叶绿素含量(52.03 SPAD)最高(P<0.05)，净光合速率、最大光化学效率(Fv/Fm=0.80)及超氧化物歧化酶、过氧化物酶活性均达峰值，丙二醛含量最低，该光强下，Cd的生物富集系数和转运系数分别为2.04和1.58，修复周期最短(41个周期)；Pb在200 μmol·m-2·s-1时修复效率最优(转运系数为0.28，修复周期为374个周期)。研究表明，适宜的光照强度(200~300 μmol·m-2·s-1)通过增强光合作用和抗氧化能力，可显著提升东南景天对Pb、Cd的富集与转运效率。 |
| 英文摘要: |
| To investigate the effects of light intensity on the remediation of Pb and Cd contaminated soil by Sedum alfredii and its physiological mechanisms, a pot experiment was conducted indoors using an artificial light system and contaminated soil collected from a mining area in Kunming. Four light intensity levels(100, 200, 300 μmol·m-2·s-1, and 400 μmol·m-2·s-1)were applied. Plant growth, photosynthetic characteristics, antioxidant system responses, and heavy metal accumulation traits were measured. The results showed that under 300 μmol·m-2·s-1 light intensity, S. alfredii exhibited the highest biomass(shoot biomass: 13.27 g·plant-1)and chlorophyll content (52.03 SPAD)(P<0.05), along with peak values in net photosynthetic rate, maximum photochemical efficiency(Fv/Fm=0.80), and activities of superoxide dismutase and peroxidase, while malondialdehyde content was the lowest. Under this light intensity, the bioconcentration factor and translocation factor for Cd were 2.04 and 1.58, respectively, resulting in the shortest remediation cycle(41 cycles). For Pb, the optimal remediation efficiency was observed at 200 μmol·m-2·s-1(translocation factor for Pb were 0.28, remediation cycle=374 cycles). This study demonstrates that appropriate light intensity(200-300 μmol·m-2·s-1) significantly enhances the accumulation and translocation of Pb and Cd in S. alfredii by improving photosynthetic performance and antioxidant capacity. |
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