Effects of natural organic acids on cadmium uptake by Sedum plumbizincicola from the soil
LI Kan-qi1, WU Jia-ling1,2, CHEN Zhe3,4, LI Mao-lin1, ZHOU Hong-yan1
1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China; 2. Shenzhen Batian Ecotypic Engineering Co., Ltd, Shenzhen 518105, China; 3. Key Laboratory of Ecology and Environmental Protection of Rare and Endangered Plants, Ministry of Education, Guangxi Normal University, Guilin 541004, China; 4. Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, Guangxi Normal University, Guilin 541004, China
Abstract：Field experiments were conducted to study the effects of low, medium and high doses of natural organic acids (malic acid and citric acid) using hole or spray application on the remediation of slightly acidic Cadmium (Cd) contaminated soil and the Cd accumulation in shoots of Sedum plumbizincicola, Then the best application pattern of natural organic acid was determined. Results showed that compared with the control, the hole/spray application of natural organic acid for 0~30d significantly reduced the soil pH value and increased available Cd concentrations in soil. The shoot biomass and Cd concentration in shoot of S. plumbizincicola were significantly increased after 60d. Spray application of low concentration citric acid is proved to be the best pattern. Compared with the control, the soil pH value decreased by 0.32 units and soil available Cd increased by 29.4% after 10d. After 60d, the shoot biomass of S. plumbizincicola increased by 38.6%, the shoot Cd content increased by 30.7%, and the shoot Cd extraction increased by 81.7%. The results showed that both malic acid and citric acid using hole/spray application were effective methods to assist S. plumbizincicola in the remediation of acidic Cd contaminated farmland soil, and the optimal application pattern was 75kg citric acid sprayed per hectare.
李侃麒, 吴佳玲, 陈喆, 李茂林, 周红燕. 天然有机酸对伴矿景天吸取土壤镉的影响[J]. 中国环境科学, 2023, 43(5): 2413-2422.
LI Kan-qi, WU Jia-ling, CHEN Zhe, LI Mao-lin, ZHOU Hong-yan. Effects of natural organic acids on cadmium uptake by Sedum plumbizincicola from the soil. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2413-2422.
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