Long-term effects of biochar on rice production and stabilisation of cadmium and arsenic levels in contaminated paddy soils

2018 ◽  
Vol 109 (3-4) ◽  
pp. 415-420
Author(s):  
Peng CHEN ◽  
Hong-Yan WANG ◽  
Rui-Lun ZHENG ◽  
Bo ZHANG ◽  
Guo-Xin SUN
Keyword(s):  
Heavy Metal ◽  
Field Experiment ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Southern China ◽  
Application Rate ◽  
Paddy Soils ◽  
Long Term Effects ◽  
Biochar Amendment

ABSTRACTHeavy metal contamination in the paddy soils of China is a serious concern because of its health risk through transfer in food chains. A field experiment was conducted in 2014–2015 to investigate the long-term effects of different biochar amendments on cadmium (Cd) and arsenic (As) immobilisation in a contaminated paddy field in southern China. Two types of biochar, a rice-straw-derived biochar (RB) and a coconut-by-product-derived biochar (CB), were amended separately to determine their impacts on rice yield and their efficacy in reducing Cd and As in rice. The two-year field experiment showed that biochar amendments significantly improved the rice yields and that CB is superior to RB, especially in the first growth season. Using a large amount of biochar amendment (22.5tha–1) significantly increased soil pH and total organic carbon, and concomitantly decreased the Cd content in rice grains over the four growth seasons, regardless of biochar type and application rate. Arsenic levels in rice were similar to the control, and results from this study suggest that there was a sustainable effect of biochar on Cd sequestration in soil and reduction of Cd accumulation in rice for at least two years. Biochar amendment in soil could be considered as a sustainable, reliable and cost-effective option to remediate heavy metal contamination in paddy fields for long periods.

scholarly journals Biochar remediation of soil: linking biochar production with function in heavy metal contaminated soils  

2021 ◽  
Author(s):  
A Taraqqi-A-Kamal ◽  
Christopher J. Atkinson ◽  
Aimal Khan ◽  
Kaikai Zhang ◽  
Peng Sun ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Soil Remediation ◽  
Contaminated Soils ◽  
Environmental Issues ◽  
Application Rate ◽  
Long Term Effects ◽  
Soil Function ◽  
Soil Functionality ◽  
Insight Into

The focus of this study is on the soil physicochemical, biological, and microbiological processes altered by biochar application to heavy metal (HM) contaminated soils. The aim is to highlight agronomical and environmental issues by which the restorative capacity of biochar might be developed. Literature shows biochar can induce soil remediation, however, it is unclear how soil processes are linked mechanistically to biochar production and if these processes can be manipulated to enhance soil remediation. The literature often fails to contribute to an improved understanding of the mechanisms by which biochar alters soil function. It is clear that factors such as biochar feedstock, pyrolysis conditions, application rate, and soil type are determinants in biochar soil functionality. These factors are developed to enhance our insight into production routes and the benefits of biochar in HM soil remediation. Despite a large number of studies of biochar in soils, there is little understanding of long-term effects, this is particularly true with respect to the use and need for reapplication in soil remediation.  

Evaluation of the potential risks of heavy metal contamination in rice paddy soils around an abandoned Hg mine area in Southwest China

2019 ◽  
Vol 39 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Bayou Adlane ◽  
Zhidong Xu ◽  
Xiaohang Xu ◽  
Longchao Liang ◽  
Jialiang Han ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Contamination ◽  
Southwest China ◽  
Heavy Metal Contamination ◽  
Rice Paddy ◽  
Paddy Soils ◽  
Mine Area ◽  
Potential Risks ◽  
Rice Paddy Soils

Hospital centered surveillance of births in Gaza, Palestine, 2011–2017 and heavy metal contamination of the mothers reveals long-term impact of wars

2019 ◽  
Vol 86 ◽  
pp. 23-32 ◽  
Author(s):  
Paola Manduca ◽  
Nabil Al Baraquni ◽  
Loai Al Baraquni ◽  
Dania Abu Abadi ◽  
Hanady Abdallah ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Long Term Impact

scholarly journals How the Soil Microbial Communities and Activities Respond to Long-Term Heavy Metal Contamination in Electroplating Contaminated Site

2021 ◽  
Vol 9 (2) ◽  
pp. 362 ◽  
Author(s):  
Wen-Jing Gong ◽  
Zi-Fan Niu ◽  
Xing-Run Wang ◽  
He-Ping Zhao
Keyword(s):  
Heavy Metal ◽  
Microbial Communities ◽  
Metal Contamination ◽  
Heavy Metal Contamination ◽  
Soil Microbial Communities ◽  
Contaminated Site ◽  
Rrna Gene ◽  
Soil Microbial ◽  
Cu And Zn

The effects of long-term heavy metal contamination on the soil biological processes and soil microbial communities were investigated in a typical electroplating site in Zhangjiakou, China. It was found that the soil of the electroplating plant at Zhangjiakou were heavily polluted by Cr, Cr (VI), Ni, Cu, and Zn, with concentrations ranged from 112.8 to 9727.2, 0 to 1083.3, 15.6 to 58.4, 10.8 to 510.0 and 69.6 to 631.6 mg/kg, respectively. Soil urease and phosphatase activities were significantly inhibited by the heavy metal contamination, while the microbial biomass carbon content and the bacterial community richness were much lower compared to noncontaminated samples, suggesting that the long-term heavy metal contamination had a severe negative effect on soil microorganisms. Differently, soil dehydrogenase was promoted in the presence of Chromate compared to noncontaminated samples. This might be due to the enrichment of Sphingomonadaceae, which have been proven to be able to secrete dehydrogenase. The high-throughput sequencing of the 16S rRNA gene documented that Proteobacteria, Actinobacteria, and Chloroflexi were the dominant bacterial phyla in the contaminated soil. The Spearman correlation analysis showed the Methylobacillus, Muribaculaceae, and Sphingomonadaceae were able to tolerate high concentrations of Cr, Cr (VI), Cu, and Zn, indicating their potential in soil remediation.

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