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Combined biochar and soda residues increases maize yields and decreases grain Cd/Pb in a highly Cd/Pb-polluted acid Udults soil

文献类型： 外文期刊

作者： Wei, Lan 1 ; Huang, Yufen 1 ; Huang, Lianxi 1 ; Huang, Qing 1 ; Li, Yanliang 1 ; Li, Xiang 1 ; Yang, Shaohai 1 ; Liu, Chu 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Plant Nutr & Fertilizer South Reg, Minist Agr, Guangzhou 510640, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangdong Key Lab Nutrient Cycling & Farmland Con, Guangzhou 510640, Peoples R China

3.Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangzhou 510650, Peoples R China

关键词： Cadmium; Lead; Biochar; Soda residues; Maize yields; Bioavailability

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

ISSN： 0167-8809

年卷期： 2021 年 306 卷

页码：

收录情况： SCI

摘要： Excessive heavy metal (HM) in soil limit crop yields and reduce quality of crops and soil. In this study, a 3-year field experiment was conducted to verify the effects of different amendment treatments on the accumulation and distribution of cadmium/lead (Cd/Pb) on maize aboveground parts and the availability of Cd/Pb in Udults soil. The treatments were CK, biochar at 5, 10, 20, 30 t ha(-1) (B1-B4), soda residues at 3 t ha(-1) (M) and biochar & soda residues (10 t ha(-1) + 3 t ha(-1); B2M). The results show that the greater the applied biochar dose, the longer lasting the mediating effect; however, the B2M treatment was the most effective and had the longest-lasting effects. Compared to CK, the B2M treatment significantly increased soil pH and total organic carbon levels by 0.68-1.44 pH units and 16.2 %-30.3 %, respectively, and reduced available Cd/Pb by 52.4 %-68.6 % and 28.3 %-40.8 %, respectively. Additionally, B2M also increased the maize grain yield by 7985.2-10,728.9 kg ha(-1) and decreased the Cd/Pb contents of maize grains by 0.16-0.21 mg kg(-1) (Cd) and 0.05-0.51 mg kg(-1) (Pb) over the 3-year period. The Cd/Pb contents in maize grain were lower than the feed additive standard (GB 13078-2017), indicating that this product can be used as animal feed. Soil pH was the most important factor to control Cd/Pb accumulation, while the Cd was also influenced by biochar physicochemical properties such as specific surface area, aromatic structures and oxygen-containing functional groups. A cost analysis for this field experiment revealed that applying combined biochar and soda residues to polluted soil had an economic benefit whereas the application of biochar alone did not.

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