Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou, Guangdong 510640, China; Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou, Guangdong 510640, China.
Environmental Sciences, School of Agriculture and Environment, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand.
Sci Total Environ. 2021 Feb 10;755(Pt 2):142582. doi: 10.1016/j.scitotenv.2020.142582. Epub 2020 Sep 30.
The application of biochar to soils contaminated with potentially toxic elements (PTEs) has received particular attention due to its ability to reduce PTE uptake by the plants. Therefore, we conducted a meta-analysis to identify Cd and Pb concentrations in plant shoots and roots in response to biochar application and soil properties. We collected data from 65 peer-reviewed journal articles published from 2009 to 2020 in which 66% of manuscripts were published from 2015 to 2020. The data were processed using OpenMEE software. The results pinpointed that addition of biochar to soil caused a significant decrease in shoot and root Cd and Pb concentrations as compared to untreated soils with biochar (control), and the reduction rate was affected by plant types and both biochar and soil properties. The biochar size less than 2 mm, biochar pH higher than 10, pyrolysis temperature of 401-600 °C, and the application rate higher than 2% appeared to be effective in reducing shoot and root Cd and Pb concentration. Soil properties such as pH, SOC, and texture influenced the efficiency of biochar for reducing plant Cd and Pb uptake. Biochar application increased SOC (54.3%), CEC (48.0%), pH (0.08), and EC (59.4%), and reduced soil extractable Cd (42.1%) and Pb (47.1%) concentration in comparison to control. A detailed study on the rhizosphere chemistry and uptake mechanism will help to underpin the biochar application rates and their efficiency reducing PTE mobility and plant uptake.
生物炭在污染潜在有毒元素（PTEs）的土壤中的应用因其降低植物吸收 PTE 的能力而受到特别关注。因此，我们进行了一项荟萃分析，以确定生物炭应用和土壤性质对植物地上部和根部吸收 Cd 和 Pb 的影响。我们从 2009 年至 2020 年期间发表的 65 篇同行评议期刊文章中收集数据，其中 66%的手稿发表于 2015 年至 2020 年。数据使用 OpenMEE 软件进行处理。结果表明，与未处理的生物炭对照土壤相比，添加生物炭会导致土壤中植物地上部和根部的 Cd 和 Pb 浓度显著降低，而这种降低率受到植物类型以及生物炭和土壤特性的影响。小于 2mm 的生物炭粒径、pH 值大于 10、热解温度为 401-600°C 以及添加率高于 2%的生物炭似乎可以有效地降低地上部和根部的 Cd 和 Pb 浓度。土壤特性如 pH 值、SOC 和质地影响生物炭对植物 Cd 和 Pb 吸收的效率。与对照相比，生物炭的应用增加了 SOC（54.3%）、CEC（48.0%）、pH 值（0.08）和 EC（59.4%），并降低了土壤可提取的 Cd（42.1%）和 Pb（47.1%）浓度。对根际化学和吸收机制的详细研究将有助于支持生物炭的应用率及其降低 PTE 迁移性和植物吸收的效率。
