Role of biochar and Eisenia fetida on metal bioavailability and biochar effects on earthworm fitness

Impact of Eisenia fetida earthworms and biochar on potentially toxic element mobility and health of a contaminated soil

“…<200 ng L -1 ), because of the very strong bonds formed between biochar and PAHs generated during pyrolysis (Godlewska et al 2021). Li et al (2011) and Huang et al (2020) both observed that biochar inhibited earthworm growth and antioxidant enzyme activities when applied to PTEs contaminated soil. However, Sanchez-Hernandez et al (2019a) showed that, although some earthworms (e.g.…”

Earthworm Enhanced Phytoremediation of U in Army Test Range Soil with Indian Mustard and Sunflower

“…Huang et al (2020) found that soil pH was decreased from 7.15 to 6.90, when 50 E. fetida were introduced into a pot with 500 g soil after 28-day exposure. 47 Similarly, after 28 days, the immobilization effect of biochar was weakened with 15-E. fetida in 450 g soil and earthworm activities significantly reduced soil pH by 0.1−0.19 unit. 48 However, more studies showed that the effects of earthworm activities were to increase rather than decrease the soil pH.…”

“…Soil pH is the primary factor controlling the mobility and bioavailability of heavy metals in soil. Huang et al (2020) found that soil pH was decreased from 7.15 to 6.90, when 50 E. fetida were introduced into a pot with 500 g soil after 28-day exposure . Similarly, after 28 days, the immobilization effect of biochar was weakened with 15- E. fetida in 450 g soil and earthworm activities significantly reduced soil pH by 0.1–0.19 unit .…”

Earthworm Community In Relation To Soil Properties And Metals In Hebei Province, North China

“…Meanwhile, RDA ranking results indicated that earthworm density (total, adult, and juvenile individuals) increased with the increase in TK or AK content (p<0.05), suggesting that K was a crucial factor that enhanced the growth of earthworms; in contrast, earthworm activities also exhibit synergistic effects on soil fertility (such as affecting nitrogen mineralization, and increasing the availability of phosphorous and potassium), promotes the survival of soil organisms even in Moreover, negatively correlations between juvenile worms and pH values (p<0.05, Table 3) suggesting that juveniles may display pH sensitivity, which directly or indirectly in uences the metal pools and earthworm community. Our study sites were located in the areas of North China with alkaline loam soil and pH ranging from 7.9 to 8.3 units, decreased the bioavailability of metals to earthworms, and possibly inhibiting the growth or reproduction of earthworms (Umiker et al, 2009;Huang et al, 2020). A previous study observed that the earthworm communities (total density and abundance) were in uenced by the soil properties (such as organic matter, pH, nitrogen, phosphorus, and potassium) in natural and agricultural ecosystems (Ernst and Emmerling, 2009;Solomou et al, 2013;Carnovale et al, 2015;Singh et al, 2020).…”

“…Furthermore, information collected from laboratory studies may be impractical (OECD 222, 2004;McBride et al, 2009). Alterations in earthworm community structure and abundance can accurately re ect the metal toxicity in elds (Wang et al, 2018;Huang et al, 2020), where metal contamination often comprises a mixture of contaminants (Pascaud et al, 2014). Compared to short-term exposure, chronic metal exposure in elds may be detrimental to earthworms; the long-term conditions may exhibit unexpected slow toxicity, even at low metal concentrations in soils (Tang et al, 2017).…”