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| Characteristics of heavy metal accumulation and physiological responses in Sedum alfredii under different light intensities |
| Received:June 28, 2025 |
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| KeyWord:Sedum alfredii;light intensity;lead and cadmium contamination;phytoremediation;photosynthetic characteristics;antioxidant enzymes |
| Author Name | Affiliation | E-mail | | ZHANG Fuqiong | Yunnan Normal University, School of Energy and Environmental Science, Kunming 650500, China | | | ZHOU Junrou | Yunnan Normal University, School of Energy and Environmental Science, Kunming 650500, China | | | BAI Guojie | Yunnan Normal University, School of Energy and Environmental Science, Kunming 650500, China | | | REN Luyao | Yunnan Normal University, School of Energy and Environmental Science, Kunming 650500, China | | | LI Zhenhui | Lijiang City Ninglang County Rural Energy and Environment Monitoring Station, Lijiang 674100, China | | | LU Jing | Lijiang City Ninglang County Rural Energy and Environment Monitoring Station, Lijiang 674100, China | | | HUANG Jingxin | Yunnan Normal University, School of Energy and Environmental Science, Kunming 650500, China | huangjingxin17@163.com |
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| Abstract: |
| 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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