DOI: 10.1016/j.ecoenv.2019.109928
论文题名: Impacts of biochar and silicate fertilizer on arsenic accumulation in rice (Oryza sativa L.)
作者: Jin W. ; Wang Z. ; Sun Y. ; Wang Y. ; Bi C. ; Zhou L. ; Zheng X.
刊名: Ecotoxicology and Environmental Safety
ISSN: 1476513
出版年: 2020
卷: 189 语种: 英语
英文关键词: Arsenic
; Biochar
; Rice
; Silicate
; Soil
Scopus关键词: arsenic
; biochar
; charcoal
; iron oxide
; silicate
; unclassified drug
; accumulation
; arsenic
; biochar
; fertilizer
; microcosm
; mobility
; rice
; silicate
; soil amendment
; Article
; bioaccumulation
; biomass
; controlled study
; dilution
; dissolution
; grain
; microcosm
; nonhuman
; phytoavailability
; plant root
; rice
; rice husk
; soil amendment
; soil pollution
; Oryza sativa
; Spartina alterniflora
英文摘要: Human exposure to arsenic (As) through rice consumption is a global food safety issue, especially in Southeast Asia. To investigate the impacts of biochar amendment (rice husk and smooth cordgrass-derived biochar) and/or silicate fertilizer on As mobility/phytoavailability in soil and on As accumulation in rice, pot and microcosm experiments were conducted. The results showed that both single application of low doses of biochar (0.5%, w/w) and coapplication of biochar with silicate fertilizer decreased As levels in grain (brown rice) by 14–16%, but not in straw and roots. The biodilution of As in grain resulting from increased grain biomass (by 6–21%) could be mainly a response to the decline in grain As levels with biochar and/or silicate fertilizer amendment. However, both applications exerted limited effects to decrease the overall As uptake by rice grain and straw, potentially due to the small changes in As mobility/phytoavailability in amended soil relative to the control, although plant-available silicon (Si) from amendment could potentially inhibit As uptake. Furthermore, microcosm-based anaerobic incubation experiments demonstrated that As levels in soil solution increased (up to 11–14-fold) with increasing doses of biochar amendment (up to 5%, w/w), possibly due to biochar enhancing the reductive dissolution of iron (oxyhydr) oxides via an increase in the total number of iron-reducing bacteria (up to 1.6–3.2-fold). Our findings suggested that a low application rate of biochar may not be a very effective approach for mitigating As accumulation in rice, while a high application rate could enhance the health risk of As in As-contaminated flooded soil. © 2019 Elsevier Inc. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159952
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai, 200241, China; Institute of Eco-Chongming, East China Normal University, Shanghai, 200241, China
Recommended Citation:
Jin W.,Wang Z.,Sun Y.,et al. Impacts of biochar and silicate fertilizer on arsenic accumulation in rice (Oryza sativa L.)[J]. Ecotoxicology and Environmental Safety,2020-01-01,189