Study on Remediation Effects of Sedum alfredii Hance and Sweet Corn Intercropping on Cadmium-Polluted Farmland

doi:10.11924/j.issn.1000-6850.casb2024-0348

Abstract

Abstract:

To investigate the efficiency of Sedum alfredii in extracting heavy metals from farmland under intercropping systems, this study employed the technique of intercropping the Cd-hyperaccumulator Sedum alfredii with sweet corn to conduct experiments in moderately cadmium-contaminated farmland in South China. The results indicated that under the intercropping system, the yield of sweet corn increased, and the Cd content in the kernels significantly decreased by 8.3% compared to monoculture. Additionally, under the intercropping system, the biomass of Sedum alfredii increased by 16.5%, with Cd accumulation in the roots and shoots increasing by 8.8% and 3.6%, respectively. The enrichment coefficients improved by 15.7 and 6.6 units, respectively. After intercropping sweet corn with Sedum alfredii, the Cd content in the top soil significantly decreased. The experiment demonstrated that the phytoremediation model of intercropping Sedum alfredii with sweet corn not only allowed for the simultaneous remediation and production of polluted farmland but also enhanced the extraction efficiency of the hyperaccumulator plant. This approach presented a practical and green remediation technology for moderately heavy metal-contaminated farmland.

Key words: heavy metal pollution, Sedum alfredii, sweet corn, interplanting, hyperaccumulator, phytoextraction

WANG Dan, DU Yanhong, LIU Chuanping, WANG Xiangqin. Study on Remediation Effects of Sedum alfredii Hance and Sweet Corn Intercropping on Cadmium-Polluted Farmland[J]. Chinese Agricultural Science Bulletin, 2024, 40(33): 118-122.

Figures/Tables 5

References 25

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不同试验处理	修复前土壤中Cd含量/(mg/kg)	根部富集系数	茎叶部位富集系数	转运系数
东南景天	2.380	70.4	182.1	2.6
甜玉米-东南景天	2.380	86.1	188.7	2.2

不同试验处理	修复前土壤中Cd含量/(mg/kg)	根部富集系数	茎叶部位富集系数	转运系数
东南景天	2.380	70.4	182.1	2.6
甜玉米-东南景天	2.380	86.1	188.7	2.2

不同处理	生物量/ (kg/hm²)	东南景天整株Cd含量/ (mg/kg)	东南景天提 Cd取量/(g/hm²)	提取前表层土壤Cd/(kg/hm²)	提取后表层土理论值/(kg/hm²)	提取后表层土实际值/ (kg/hm²)
甜玉米	—	—	—	5.36	—	5.6±0.5a
东南景天	1093.7±40.5b	601.0	657.3±24.3b	5.36	4.70	3.6±0.3b
甜玉米+东南景天	1274.0±64.5a	654.1	833.3±42.2a	5.36	4.53	2.6±0.1c

不同处理	生物量/ (kg/hm²)	东南景天整株Cd含量/ (mg/kg)	东南景天提 Cd取量/(g/hm²)	提取前表层土壤Cd/(kg/hm²)	提取后表层土理论值/(kg/hm²)	提取后表层土实际值/ (kg/hm²)
甜玉米	—	—	—	5.36	—	5.6±0.5a
东南景天	1093.7±40.5b	601.0	657.3±24.3b	5.36	4.70	3.6±0.3b
甜玉米+东南景天	1274.0±64.5a	654.1	833.3±42.2a	5.36	4.53	2.6±0.1c