期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 762, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.143117
关键词
Biochar; Arsenic (As); Cadmium (Cd); Soil remediation; Bioaccumulation; Meta-analysis
资金
- National Key Research and Development Programof China [2018YFD0800602]
Biochar application in co-contaminated soils can simultaneously reduce the bioavailability of cadmium and arsenic, decreasing the uptake of these heavy metals by plants. Critical factors for the effectiveness include the type of biochar, pyrolysis temperature, application rate, and soil organic carbon content.
Biochar, an effective and low-cost amendment for immobilizing heavy metals, has been extensively studied. However, the simultaneous inhibition effects of biochar on the plant uptake for arsenic (As) and cadmium (Cd) in co-contaminated soils are still ambiguous due to their distinct environmental behaviors. A meta-analysis was conducted to quantitatively assess the effects using 1030 individual observations from 52 articles. On average, biochar application significantly decreased the bioavailability of Cd in soils by 50.12%, while slightly increased the bioavailability of As in soils by 2.39%. The more instructive result is that biochar application could also simultaneously reduce the concentration of As and Cd in plants by 25.48% and 38.66%, respectively. The orders of the decreased percentage of As and Cd in various tissues were root < stem < leaf < grain, and root < leaf < stem < grain, respectively. According to the analysis of critical factors, manure biochar, low pyrolysis temperature (at <400 degrees C), low application rate (<2%), and high SOC (>30 g/kg) were more conducive to reduce the bioaccumulation of As and Cd simultaneously in co-contaminated soils. Pristine and modified biochar could inhibit As and Cd accumulation in crops, but their efficiencies need to be further improved to ensure the safety of crop productions. Overall, the meta-analysis suggests that biochar has the potential to remedy the As and Cd co-contaminated soils. (C) 2020 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据