Feng Li1,2, Zhian Li3, Peng Mao1,2, Yingwen Li1, Yongxing Li1, Murray B McBride4, Jingtao Wu5, Ping Zhuang6. 1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China. 2. University of Chinese Academy of Sciences, Beijing, 100049, China. 3. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China. lizan@scbg.ac.cn. 4. Section of Soil and Crop Sciences, Cornell University, Ithaca, NY, 14853, USA. 5. School of Agriculture and Food Sciences, The University of Queensland, St. Lucia, QId 4072, Australia. 6. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China. zhuangp@scbg.ac.cn.
Abstract
A pot experiment and a leaching experiment were conducted to investigate the effects of earthworms and pig manure on heavy metals (Cd, Pb, and Zn) immobility, in vitro bioaccessibility and leachability under simulated acid rain (SAR). Results showed manure significantly increased soil organic carbon (SOC), dissolved organic carbon (DOC), available phosphorus (AP), total N, total P and pH, and decreased CaCl2-extractable metals and total heavy metals in water and SAR leachate. The addition of earthworms significantly increased AP (from 0.38 to 1.7 mg kg-1), and a downward trend in CaCl2-extractable and total leaching loss of heavy metals were observed. The combined earthworm and manure treatment decreased CaCl2-extractable Zn, Cd, and Pb. For Na4P2O7-extractable metals, Cd and Pb were decreased with increasing manure application rate. Application of earthworm alone did not contribute to the remediation of heavy metal polluted soils. Considering the effects on heavy metal immobilization and cost, the application of 6% manure was an alternative approach for treating contaminated soils. These findings provide valuable information for risk management during immobilization of heavy metals in contaminated soils.
A pot experiment and a leaching experiment were conducted to investigate the effects of earthworms anpan>d pan> class="Species">pig manure on heavy metals (Cd, Pb, and Zn) immobility, in vitro bioaccessibility and leachability under simulated acid rain (SAR). Results showed manure significantly increased soil organic carbon (SOC), dissolved organic carbon (DOC), available phosphorus (AP), total N, total P and pH, and decreased CaCl2-extractable metals and total heavy metals in water and SAR leachate. The addition of earthworms significantly increased AP (from 0.38 to 1.7 mg kg-1), and a downward trend in CaCl2-extractable and total leaching loss of heavy metals were observed. The combined earthworm and manure treatment decreased CaCl2-extractable Zn, Cd, and Pb. For Na4P2O7-extractable metals, Cd and Pb were decreased with increasing manure application rate. Application of earthworm alone did not contribute to the remediation of heavy metal polluted soils. Considering the effects on heavy metal immobilization and cost, the application of 6% manure was an alternative approach for treating contaminated soils. These findings provide valuable information for risk management during immobilization of heavy metals in contaminated soils.
Authors: Binggan Wei; Jiangping Yu; Zhiqiang Cao; Min Meng; Linsheng Yang; Qing Chen Journal: Int J Environ Res Public Health Date: 2020-07-25 Impact factor: 3.390
Authors: Usman Zulfiqar; Wenting Jiang; Wang Xiukang; Saddam Hussain; Muhammad Ahmad; Muhammad Faisal Maqsood; Nauman Ali; Muhammad Ishfaq; Muhammad Kaleem; Fasih Ullah Haider; Naila Farooq; Muhammad Naveed; Jiri Kucerik; Martin Brtnicky; Adnan Mustafa Journal: Front Plant Sci Date: 2022-03-09 Impact factor: 5.753