Effects of biochar on availability and plant uptake of heavy metals – A meta-analysis

De, Chen; Liu, Xiaoyu; Bian, Rongjun; Cheng, Kun; Zhang, Xuhui; Zheng, Jufeng; Joseph, Stephen; Crowley, David E.; Pan, Genxing; Li, Lianqing

doi:10.1016/j.jenvman.2018.05.004

Cited by 178 publications

(77 citation statements)

References 72 publications

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“…3D). This was similar to the results of Gartler et al (2013), who found no effect on lettuce Zn with PC biochar; and Chen et al (2018), who indicated little overall effect of wood (cellulosic) biochar on plant Zn concentrations in their metaanalysis. However, there was a reduction in lettuce Zn concentration with PC for the Coxville soil in our study.…”

Section: Discussionsupporting

confidence: 87%

“…However, there was a reduction in lettuce Zn concentration with PC for the Coxville soil in our study. We saw a decrease in lettuce leaf Zn primarily with the manurebased biochars, whereas Chen et al (2018) reported little change in plant Zn with manure biochars.…”

Section: Discussionmentioning

confidence: 70%

“…While, in general, more coarse or medium texture soils have been shown a greater increase in crop productivity with biochar addition than fine texture soils (Jeffery et al, 2011), there is no clear-cut picture of the relationship between soil char-acteristics, biochar, and concentrations of nutrients in plant tissues. Based on their meta-analysis, Chen et al (2018) reported a larger decrease in plant Zn concentrations with biochar applications for a fine soil than with coarse or medium texture soils. However, we saw little difference in lettuce leaf and a highly variable difference in carrot taproot Zn between the finer texture Coxville and coarser texture Norfolk soil.…”

Section: Discussionmentioning

confidence: 99%

“…Addition of cassava stem biochar to a Cd-and Zn-contaminated soil reduced the bioavailability of both nutrients and concentration of Zn but increased the concentration of Cd in Vigna radiata L. roots and shoots (Prapagdee et al, 2014). Based on a meta-analysis, Chen et al (2018) estimated an average 17% decrease in plant Zn with biochar application across a wide variety of conditions. Because some of these trace nutrients such as Zn and Mn are also essential for humans, any reduction of normally low concentrations in soils due to biochar could also adversely affect human health.…”

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confidence: 99%

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Biochar Affects Essential Nutrients of Carrot Taproots and Lettuce Leaves

Olszyk¹,

Shiroyama²,

Novak³

et al. 2020

horts

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Essential nutrient concentrations in crops can affect human health. While biochar has the potential as a soil amendment to improve crop yields, it may also affect the concentrations of nutrients such as Ca, Fe, K, Mg, Mn, and Zn in edible portions of crops. To better characterize effects of biochar on important human nutrients in food crops, we evaluated the effects of biochar on lettuce (Lactuca sativa L. cv. Black-Seeded Simpson) leaf and carrot [Daucus carota subsp. sativus (Hoffm.) Schübl. cv. Tendersweet] developing taproot nutrients. Plants were grown in pots in a greenhouse using sandy loam (Coxville, fine, kaolinitic, thermic Typic Paleaquults) and loamy sand (Norfolk, fine-loamy, kaolinitic, thermic Typic Kandiudults,) series soils, amended with biochar produced from four feedstocks: pine chips (PC), poultry litter (PL), swine solids (SS), and switchgrass (SG); and two blends of PC plus PL [PC/PL, 50%/50% (55) and 80%/20% (82) by weight]. Biochar was produced at 350, 500, and 700 °C from each feedstock. Lettuce leaf and carrot taproot total nutrient concentrations were determined by inductively coupled plasma analysis. Biochar (especially at least in part manure-based, i.e., PL, SS, 55, and 82 at nearly all temperatures) primarily decreased nutrient concentrations in lettuce leaves, with Ca, Mg, and Zn affected most. Carrot taproot nutrient concentrations also deceased, but to a lesser extent. Some biochars increased leaf or taproot nutrient concentrations, especially K. This study indicated that biochar can both decrease and increase leaf and taproot nutrient concentrations important for human health. Thus, potential effects on nutrients in plants should be carefully considered when biochar is used as a soil amendment with vegetable crops.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Biochar Affects Essential Nutrients of Carrot Taproots and Lettuce Leaves

Olszyk¹,

Shiroyama²,

Novak³

et al. 2020

horts

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“…Various soil decontamination techniques have been used to reduce the content of heavy metals (Wuana & Okieimen, 2011), copper (Tomczyk, Boguta, & Sokołowska, 2019), or pesticides (Marican & Durán‐Lara, 2018). One decontamination method proposed is biochar application (Chen et al., 2018; Kavitha et al., 2018; Shaaban et al., 2018; Varjani, Kumar, & Rene, 2019). It has already been shown that biochar has a positive effect on the physical and chemical properties of soil (Atkinson, Fitzgerald, & Hipps, 2010; Lehmann, Gaunt, & Rondon, 2006; Usowicz, Lipiec, Łukowski, Marczewski, & Usowicz, 2016) and can significantly affect the growth and development of plants (Kavitha et al., 2018; Latawiec et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Impact of soil incorporation of biochar on environmental radioactivity

et al. 2020

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Biochar (charcoal made from biomass in the pyrolysis process) has found broad application in agriculture. It helps to improve both the physical and chemical properties of soil through decontamination of heavy metals and pesticides. This work examines the potential for biochar application to improve the radiological condition of soil. We investigated the activity concentration of natural and anthropogenic radionuclides in soil samples collected from fields treated with various doses of biochar (in 1–100 Mg ha−1). In addition, we directly measured radon emission rate at the experimental fields. The analyses were performed using gamma spectrometry and an active method for radon emission using an AlphaGUARD instrument equipped with an accumulation box. The results of activity concentration assessments for six radionuclides, five natural and one anthropogenic, show that the only effect of biochar application into the soil is associated with the reduction of soil bulk density by this material. The radon emission rate increased by 6 mBq m−1 s−1, on average, depending on the biochar dose (from 1 to 100 Mg ha−1). Our results demonstrate that application of biochar into soil kept without vegetation had a limited influence on the radioactivity in the environment.

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